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Jamil M, Margueritte O, Yonli D, Wang JY, Navangi L, Mudavadi P, Patil RH, Bhoge SE, Traore H, Runo S, Al-Babili S. Evaluation of granular formulated strigolactone analogs for Striga suicidal germination. PEST MANAGEMENT SCIENCE 2024. [PMID: 38634513 DOI: 10.1002/ps.8136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 03/24/2024] [Accepted: 04/18/2024] [Indexed: 04/19/2024]
Abstract
BACKGROUND Striga hermonthica, an obligate root parasitic weed, poses a significant threat to cereal production in sub-Saharan Africa. Lowering Striga seed bank in infested soils is a promising strategy to mitigate infestation levels. The dependency of Striga seed germination on strigolactones opens up the possibility of a 'suicidal germination' approach, where synthetic germination stimulants induce lethal germination in the absence of a host. Implementing this approach requires active germination stimulants with a suitable formulation for field application. Here, we describe the development of slow-releasing granular formulation of two potent germination stimulants 'Methyl Phenlactonoate 3' and 'Nijmegen-1' and the assessment of their activity under Laboratory, greenhouse, mini-field, and field conditions. RESULTS Under laboratory conditions, the granular formulation of either of the two germination stimulants (1.25 mg per plate, corresponding to 0.09 mg a.i.) induced Striga seed germination at a rate of up to 43%. With 10 mg granular product (0.75 mg a.i.) per pot, we observed 77-83% reduction in Striga emergence under greenhouse pot conditions. Application of the formulated stimulants under artificially or naturally infested fields resulted in approximately 56%, 60%, and 72% reduction in Striga emergence in maize, sorghum, and millet fields in Kenya and Burkina Faso, respectively. CONCLUSION Our findings on the newly designed granular formulation of Methyl Phenlactonoate 3 and Nijmegen-1 reveal encouraging prospects for addressing the Striga problem in Africa. These findings underscore several significant advantages of the formulated stimulants, including suitability for the African agricultural context, and, most importantly, their effectiveness in reducing Striga infection. © 2024 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Muhammad Jamil
- The BioActives Laboratory, Center for Desert Agriculture, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Ouedraogo Margueritte
- Institut de l'Environnement et de Recherches Agricoles (INERA), Ouagadougou, Burkina Faso
| | - Djibril Yonli
- Institut de l'Environnement et de Recherches Agricoles (INERA), Ouagadougou, Burkina Faso
| | - Jian You Wang
- The BioActives Laboratory, Center for Desert Agriculture, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Lynet Navangi
- Kenya Agricultural and Livestock Research Organization, Alupe Center, Busia, Kenya
| | - Patrick Mudavadi
- Kenya Agricultural and Livestock Research Organization, Alupe Center, Busia, Kenya
| | - Rohit H Patil
- UPL House, Express Highway, Bandra-East, Mumbai, India
| | | | - Hamidou Traore
- Institut de l'Environnement et de Recherches Agricoles (INERA), Ouagadougou, Burkina Faso
| | - Steven Runo
- Department of Biochemistry, Microbiology and Biotechnology, Kenyatta University, Nairobi, Kenya
| | - Salim Al-Babili
- The BioActives Laboratory, Center for Desert Agriculture, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
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2
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Du L, Li X, Ding Y, Ma D, Yu C, Duan L. Design, Synthesis, and Bioactivities of N-Heterocyclic Ureas as Strigolactone Response Antagonists against Parasitic-Weed Seed Germination. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024. [PMID: 38593208 DOI: 10.1021/acs.jafc.3c08174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
The pernicious parasitism exhibited by root parasitic weeds such as Orobanche and Striga poses substantial peril to agricultural productivity and global food security. This deleterious phenomenon hinges upon the targeted induction of the signaling molecule strigolactones (SLs). Consequently, the identification of prospective SL antagonists holds significant promise in the realm of mitigating the infection of these pernicious weeds. In this study, we synthesized and characterized D12 based on a potent SL antagonist KK094. In vivo assay results demonstrated that D12 remarkably impedes the germination of Phelipanche aegyptiaca and Striga asiatica seeds, while also alleviating the inhibitory consequence of the SL analogue GR24 on hypocotyl elongation in Arabidopsis thaliana. The docking study and ITC assay indicated that D12 can interact strongly with the SL receptor protein, which may interfere with the binding of SL to the receptor protein as a result. In addition, the results of crop safety assessment tests showed that D12 had no adverse effects on rice seed germination and seedling growth and development. The outcomes obtained from the present study suggested that D12 exhibited promise as a prospective antagonist of SL receptors, thereby displaying substantial efficacy in impeding the seed germination process of root parasitic weeds, providing a promising basis for rational design and development of further Striga-specific herbicides.
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Affiliation(s)
- Lin Du
- State Key Laboratory of Plant Environmental Resilience & Engineering Research Center of Plant Growth Regulator, MOE, College of Agronomy and Biotechnology, China Agricultural University, 2 Yuanmingyuan West Road, Beijing 100193, China
| | - Xingjia Li
- College of Plant Science and Technology, Beijing University of Agriculture, Beijing 102206, China
| | - Yimin Ding
- State Key Laboratory of Plant Environmental Resilience & Engineering Research Center of Plant Growth Regulator, MOE, College of Agronomy and Biotechnology, China Agricultural University, 2 Yuanmingyuan West Road, Beijing 100193, China
| | - Dengke Ma
- State Key Laboratory of Plant Environmental Resilience & Engineering Research Center of Plant Growth Regulator, MOE, College of Agronomy and Biotechnology, China Agricultural University, 2 Yuanmingyuan West Road, Beijing 100193, China
| | - Chunxin Yu
- College of Plant Science and Technology, Beijing University of Agriculture, Beijing 102206, China
| | - Liusheng Duan
- State Key Laboratory of Plant Environmental Resilience & Engineering Research Center of Plant Growth Regulator, MOE, College of Agronomy and Biotechnology, China Agricultural University, 2 Yuanmingyuan West Road, Beijing 100193, China
- College of Plant Science and Technology, Beijing University of Agriculture, Beijing 102206, China
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3
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Jamil M, Alagoz Y, Wang JY, Chen GTE, Berqdar L, Kharbatia NM, Moreno JC, Kuijer HNJ, Al-Babili S. Abscisic acid inhibits germination of Striga seeds and is released by them likely as a rhizospheric signal supporting host infestation. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2024; 117:1305-1316. [PMID: 38169533 DOI: 10.1111/tpj.16610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 11/29/2023] [Accepted: 12/15/2023] [Indexed: 01/05/2024]
Abstract
Seeds of the root parasitic plant Striga hermonthica undergo a conditioning process under humid and warm environments before germinating in response to host-released stimulants, particularly strigolactones (SLs). The plant hormone abscisic acid (ABA) regulates different growth and developmental processes, and stress response; however, its role during Striga seed germination and early interactions with host plants is under-investigated. Here, we show that ABA inhibited Striga seed germination and that hindering its biosynthesis induced conditioning and germination in unconditioned seeds, which was significantly enhanced by treatment with the SL analog rac-GR24. However, the inhibitory effect of ABA remarkably decreased during conditioning, confirming the loss of sensitivity towards ABA in later developmental stages. ABA measurement showed a substantial reduction of its content during the early conditioning stage and a significant increase upon rac-GR24-triggered germination. We observed this increase also in released seed exudates, which was further confirmed by using the Arabidopsis ABA-reporter GUS marker line. Seed exudates of germinated seeds, containing elevated levels of ABA, impaired the germination of surrounding Striga seeds in vitro and promoted root growth of a rice host towards germinated Striga seeds. Application of ABA as a positive control caused similar effects, indicating its function in Striga/Striga and Striga/host communications. In summary, we show that ABA is an essential player during seed dormancy and germination processes in Striga and acts as a rhizospheric signal likely to support host infestation.
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Affiliation(s)
- Muhammad Jamil
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Yagiz Alagoz
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Jian You Wang
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Guan-Ting Erica Chen
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
- Plant Science Program, Biological and Environmental Science and Engineering (BESE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Lamis Berqdar
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Najeh M Kharbatia
- Analytical Chemistry Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Juan C Moreno
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Hendrik N J Kuijer
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Salim Al-Babili
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
- Plant Science Program, Biological and Environmental Science and Engineering (BESE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
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Han M, Yang H, Huang H, Du J, Zhang S, Fu Y. Allelopathy and allelobiosis: efficient and economical alternatives in agroecosystems. PLANT BIOLOGY (STUTTGART, GERMANY) 2024; 26:11-27. [PMID: 37751515 DOI: 10.1111/plb.13582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 08/28/2023] [Indexed: 09/28/2023]
Abstract
Chemical interactions in plants often involve plant allelopathy and allelobiosis. Allelopathy is an ecological phenomenon leading to interference among organisms, while allelobiosis is the transmission of information among organisms. Crop failures and low yields caused by inappropriate management can be related to both allelopathy and allelobiosis. Therefore, research on these two phenomena and the role of chemical substances in both processes will help us to understand and upgrade agroecosystems. In this review, substances involved in allelopathy and allelobiosis in plants are summarized. The influence of environmental factors on the generation and spread of these substances is discussed, and relationships between allelopathy and allelobiosis in interspecific, intraspecific, plant-micro-organism, plant-insect, and mechanisms, are summarized. Furthermore, recent results on allelopathy and allelobiosis in agroecosystem are summarized and will provide a reference for the future application of allelopathy and allelobiosis in agroecosystem.
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Affiliation(s)
- M Han
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin, China
- Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin, China
- College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, China
| | - H Yang
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin, China
- Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin, China
- College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, China
| | - H Huang
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin, China
- Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin, China
- College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, China
| | - J Du
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin, China
- Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin, China
- College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, China
| | - S Zhang
- The College of Forestry, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, Beijing, China
- Ecological Observation and Research Station of Heilongjiang Sanjiang Plain Wetlands, National Forestry and Grassland Administration, Shuangyashan, China
| | - Y Fu
- The College of Forestry, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, Beijing, China
- Ecological Observation and Research Station of Heilongjiang Sanjiang Plain Wetlands, National Forestry and Grassland Administration, Shuangyashan, China
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5
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Ito S. Recent advances in the regulation of root parasitic weed damage by strigolactone-related chemicals. Biosci Biotechnol Biochem 2023; 87:247-255. [PMID: 36610999 DOI: 10.1093/bbb/zbac208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 12/08/2022] [Indexed: 12/24/2022]
Abstract
Root parasitic weeds such as Striga spp. and Orobanche spp. dramatically reduce the yields of important agricultural crops and cause economic losses of over billions of US dollars worldwide. One reason for the damage by root parasitic weeds is that they germinate after specifically recognizing the host cues, strigolactones (SLs). SLs were identified ˃50 years ago as germination stimulants for root parasitic weeds, and various studies have been conducted to control parasitic weeds using SLs and related chemicals. Recently, biochemical and molecular biological approaches have revealed the SL biosynthesis and SL receptors; using these findings, various SL-related chemicals have been developed. This review summarizes recent research on SLs and their related chemicals for controlling root parasitic weeds.
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Affiliation(s)
- Shinsaku Ito
- Department of Bioscience, Faculty of Life Sciences, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya, Tokyo, Japan
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6
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Berestetskiy A. Modern Approaches for the Development of New Herbicides Based on Natural Compounds. PLANTS (BASEL, SWITZERLAND) 2023; 12:234. [PMID: 36678947 PMCID: PMC9864389 DOI: 10.3390/plants12020234] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 12/13/2022] [Accepted: 12/24/2022] [Indexed: 05/12/2023]
Abstract
Weeds are a permanent component of anthropogenic ecosystems. They require strict control to avoid the accumulation of their long-lasting seeds in the soil. With high crop infestation, many elements of crop production technologies (fertilization, productive varieties, growth stimulators, etc.) turn out to be practically meaningless due to high yield losses. Intensive use of chemical herbicides (CHs) has led to undesirable consequences: contamination of soil and wastewater, accumulation of their residues in the crop, and the emergence of CH-resistant populations of weeds. In this regard, the development of environmentally friendly CHs with new mechanisms of action is relevant. The natural phytotoxins of plant or microbial origin may be explored directly in herbicidal formulations (biorational CHs) or indirectly as scaffolds for nature-derived CHs. This review considers (1) the main current trends in the development of CHs that may be important for the enhancement of biorational herbicides; (2) the advances in the development and practical application of natural compounds for weed control; (3) the use of phytotoxins as prototypes of synthetic herbicides. Some modern approaches, such as computational methods of virtual screening and design of herbicidal molecules, development of modern formulations, and determination of molecular targets, are stressed as crucial to make the exploration of natural compounds more effective.
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Affiliation(s)
- Alexander Berestetskiy
- Laboratory of Phytotoxicology and Biotechnology, All-Russian Institute of Plant Protection, Pushkin, 196608 Saint-Petersburg, Russia
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7
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Soliman S, Wang Y, Han Z, Pervaiz T, El-kereamy A. Strigolactones in Plants and Their Interaction with the Ecological Microbiome in Response to Abiotic Stress. PLANTS (BASEL, SWITZERLAND) 2022; 11:3499. [PMID: 36559612 PMCID: PMC9781102 DOI: 10.3390/plants11243499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 12/07/2022] [Accepted: 12/08/2022] [Indexed: 06/17/2023]
Abstract
Phytohormones play an essential role in enhancing plant tolerance by responding to abiotic stresses, such as nutrient deficiency, drought, high temperature, and light stress. Strigolactones (SLs) are carotenoid derivatives that occur naturally in plants and are defined as novel phytohormones that regulate plant metabolism, growth, and development. Strigolactone assists plants in the acquisition of defensive characteristics against drought stress by initiating physiological responses and mediating the interaction with soil microorganisms. Nutrient deficiency is an important abiotic stress factor, hence, plants perform many strategies to survive against nutrient deficiency, such as enhancing the efficiency of nutrient uptake and forming beneficial relationships with microorganisms. Strigolactone attracts various microorganisms and provides the roots with essential elements, including nitrogen and phosphorus. Among these advantageous microorganisms are arbuscular mycorrhiza fungi (AMF), which regulate plant metabolic activities through phosphorus providing in roots. Bacterial nodulations are also nitrogen-fixing microorganisms found in plant roots. This symbiotic relationship is maintained as the plant provides organic molecules, produced in the leaves, that the bacteria could otherwise not independently generate. Related stresses, such as light stress and high-temperature stress, could be affected directly or indirectly by strigolactone. However, the messengers of these processes are unknown. The most prominent connector messengers have been identified upon the discovery of SLs and the understanding of their hormonal effect. In addition to attracting microorganisms, these groups of phytohormones affect photosynthesis, bridge other phytohormones, induce metabolic compounds. In this article, we highlighted the brief information available on SLs as a phytohormone group regarding their common related effects. In addition, we reviewed the status and described the application of SLs and plant response to abiotic stresses. This allowed us to comprehend plants' communication with the ecological microbiome as well as the strategies plants use to survive under various stresses. Furthermore, we identify and classify the SLs that play a role in stress resistance since many ecological microbiomes are unexplained.
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Affiliation(s)
- Sabry Soliman
- Department of Botany and Plant Sciences, University of California Riverside, Riverside, CA 92521, USA
- Department of Horticulture, Faculty of Agriculture, Ain Shams University, Cairo 11566, Egypt
- Department of Fruit Science, College of Horticulture, China Agriculture University, Beijing 100083, China
| | - Yi Wang
- Department of Fruit Science, College of Horticulture, China Agriculture University, Beijing 100083, China
| | - Zhenhai Han
- Department of Fruit Science, College of Horticulture, China Agriculture University, Beijing 100083, China
| | - Tariq Pervaiz
- Department of Botany and Plant Sciences, University of California Riverside, Riverside, CA 92521, USA
| | - Ashraf El-kereamy
- Department of Botany and Plant Sciences, University of California Riverside, Riverside, CA 92521, USA
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8
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Peralta AC, Soriano G, Zorrilla JG, Masi M, Cimmino A, Fernández-Aparicio M. Characterization of Conyza bonariensis Allelochemicals against Broomrape Weeds. Molecules 2022; 27:7421. [PMID: 36364247 PMCID: PMC9654463 DOI: 10.3390/molecules27217421] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 10/24/2022] [Accepted: 10/27/2022] [Indexed: 04/12/2024] Open
Abstract
The study of allelopathic activity of plants and the isolation and characterization of the responsible allelochemicals can lead to the development of environment friendly alternative approaches to weed control. Conyza species are invasive weeds that use allelopathic activity as part of a successful strategy to outcompete neighboring plants. Broomrape weeds are parasitic plants that use host-induced germination and the formation of a haustorium as strategies to infect host plants. The control of broomrape infection in most affected crops is limited or non-existing. In the current study, we investigated the allelopathic activity of Conyza bonariensis organic extracts in suicidal germination and radicle growth of four broomrape species (Orobanche crenata, Orobanche cumana, Orobanche minor and Phelipanche ramosa). A bioactivity-driven fractionation of Conyza bonariensis extracts led to the identification of two germination-inducing molecules and two growth-inhibitory compounds. The germination-inducing metabolites had species-specific activity being hispidulin active on seeds of O. cumana and methyl 4-hydroxybenzoate active in P. ramosa. The growth-inhibitory metabolites (4Z)-lachnophyllum lactone and (4Z,8Z)-matricaria lactone strongly inhibited the radicle growth of all parasitic weed species studied. Some structure-activity relationships were found as result of the study herein presented.
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Affiliation(s)
- Antonio Cala Peralta
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy
- Allelopathy Group, Department of Organic Chemistry, Facultad de Ciencias, Institute of Biomolecules (INBIO), University of Cadiz, C/Avenida República Saharaui, s/n, 11510 Puerto Real, Spain
| | - Gabriele Soriano
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy
| | - Jesús G. Zorrilla
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy
- Allelopathy Group, Department of Organic Chemistry, Facultad de Ciencias, Institute of Biomolecules (INBIO), University of Cadiz, C/Avenida República Saharaui, s/n, 11510 Puerto Real, Spain
| | - Marco Masi
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy
| | - Alessio Cimmino
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy
| | - Mónica Fernández-Aparicio
- Department of Plant Breeding, Institute for Sustainable Agriculture (IAS), CSIC, Avenida Menéndez Pidal s/n, 14004 Córdoba, Spain
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Kleman J, Matusova R. Strigolactones: Current research progress in the response of plants to abiotic stress. Biologia (Bratisl) 2022. [DOI: 10.1007/s11756-022-01230-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Kawada K, Koyama T, Takahashi I, Nakamura H, Asami T. Emerging technologies for the chemical control of root parasitic weeds. JOURNAL OF PESTICIDE SCIENCE 2022; 47:101-110. [PMID: 36479457 PMCID: PMC9706279 DOI: 10.1584/jpestics.d22-045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 07/22/2022] [Indexed: 06/17/2023]
Abstract
Parasitic plants in the Orobanchaceae family include devastating weed species, such as Striga, Orobanche, and Phelipanche, which parasitize major crops, drastically reduces crop yields and cause economic losses of over a billion US dollars worldwide. Advances in basic research on molecular and cellular processes responsible for parasitic relationships has now achieved steady progress through advances in genome analysis, biochemical analysis and structural biology. On the basis of these advances it is now possible to develop chemicals that control parasitism and reduce agricultural damage. In this review we summarized the recent development of chemicals that can control each step of parasitism from strigolactone biosynthesis in host plants to haustorium formation.
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Affiliation(s)
- Kojiro Kawada
- Graduade School of Agricultural and Life Sciences, The University of Tokyo
| | - Tomoyuki Koyama
- Graduade School of Agricultural and Life Sciences, The University of Tokyo
| | - Ikuo Takahashi
- Graduade School of Agricultural and Life Sciences, The University of Tokyo
| | - Hidemitsu Nakamura
- Graduade School of Agricultural and Life Sciences, The University of Tokyo
| | - Tadao Asami
- Graduade School of Agricultural and Life Sciences, The University of Tokyo
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11
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Specialized Metabolites from the Allelopathic Plant Retama raetam as Potential Biopesticides. Toxins (Basel) 2022; 14:toxins14050311. [PMID: 35622558 PMCID: PMC9146260 DOI: 10.3390/toxins14050311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 04/22/2022] [Accepted: 04/25/2022] [Indexed: 12/17/2022] Open
Abstract
To cope with the rising food demand, modern agriculture practices are based on the indiscriminate use of agrochemicals. Although this strategy leads to a temporary solution, it also severely damages the environment, representing a risk to human health. A sustainable alternative to agrochemicals is the use of plant metabolites and plant-based pesticides, known to have minimal environmental impact compared to synthetic pesticides. Retama raetam is a shrub growing in Algeria’s desert areas, where it is commonly used in traditional medicine because of its antiseptic and antipyretic properties. Furthermore, its allelopathic features can be exploited to effectively control phytopathogens in the agricultural field. In this study, six compounds belonging to isoflavones and flavones subgroups have been isolated from the R. raetam dichloromethane extract and identified using spectroscopic and optical methods as alpinumisoflavone, hydroxyalpinumisoflavone, laburnetin, licoflavone C, retamasin B, and ephedroidin. Their antifungal activity was evaluated against the fungal phytopathogen Stemphylium vesicarium using a growth inhibition bioassay on PDA plates. Interestingly, the flavonoid laburnetin, the most active metabolite, displayed an inhibitory activity comparable to that exerted by the synthetic fungicide pentachloronitrobenzene, in a ten-fold lower concentration. The allelopathic activity of R. raetam metabolites against parasitic weeds was also investigated using two independent parasitic weed bioassays to discover potential activities on either suicidal stimulation or radicle growth inhibition of broomrapes. In this latter bioassay, ephedroidin strongly inhibited the growth of Orobanche cumana radicles and, therefore, can be proposed as a natural herbicide.
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Jamil M, Wang JY, Yonli D, Patil RH, Riyazaddin M, Gangashetty P, Berqdar L, Chen GTE, Traore H, Margueritte O, Zwanenburg B, Bhoge SE, Al-Babili S. A New Formulation for Strigolactone Suicidal Germination Agents, towards Successful Striga Management. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11060808. [PMID: 35336692 PMCID: PMC8955415 DOI: 10.3390/plants11060808] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 03/09/2022] [Accepted: 03/15/2022] [Indexed: 05/14/2023]
Abstract
Striga hermonthica, a member of the Orobanchaceae family, is an obligate root parasite of staple cereal crops, which poses a tremendous threat to food security, contributing to malnutrition and poverty in many African countries. Depleting Striga seed reservoirs from infested soils is one of the crucial approaches to minimize subterranean damage to crops. The dependency of Striga germination on the host-released strigolactones (SLs) has prompted the development of the "Suicidal Germination" strategy to reduce the accumulated seed bank of Striga. The success of aforementioned strategy depends not only on the activity of the applied SL analogs, but also requires suitable application protocol with simple, efficient, and handy formulation for rain-fed African agriculture. Here, we developed a new formulation "Emulsifiable Concentration (EC)" for the two previously field-assessed SL analogs Methyl phenlactonoate 3 (MP3) and Nijmegen-1. The new EC formulation was evaluated for biological activities under lab, greenhouse, mini-field, and field conditions in comparison to the previously used Atlas G-1086 formulation. The EC formulation of SL analogs showed better activities on Striga germination with lower EC50 and high stability under Lab conditions. Moreover, EC formulated SL analogs at 1.0 µM concentrations reduced 89-99% Striga emergence in greenhouse. The two EC formulated SL analogs showed also a considerable reduction in Striga emergence in mini-field and field experiments. In conclusion, we have successfully developed a desired formulation for applying SL analogs as suicidal agents for large-scale field application. The encouraging results presented in this study pave the way for integrating the suicidal germination approach in sustainable Striga management strategies for African agriculture.
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Affiliation(s)
- Muhammad Jamil
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia; (M.J.); (J.Y.W.); (L.B.); (G.-T.E.C.)
| | - Jian You Wang
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia; (M.J.); (J.Y.W.); (L.B.); (G.-T.E.C.)
| | - Djibril Yonli
- Institut de l’Environnement et de Recherches Agricoles (INERA), Ouagadougou 04 BP 8645, Burkina Faso; (D.Y.); (H.T.); (O.M.)
| | - Rohit H. Patil
- UPL House, Express Highway, Bandra-East, Mumbai 400 051, Maharashtra, India; (R.H.P.); (S.E.B.)
| | - Mohammed Riyazaddin
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Niamey BP 12404, Niger; (M.R.); (P.G.)
| | - Prakash Gangashetty
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Niamey BP 12404, Niger; (M.R.); (P.G.)
| | - Lamis Berqdar
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia; (M.J.); (J.Y.W.); (L.B.); (G.-T.E.C.)
| | - Guan-Ting Erica Chen
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia; (M.J.); (J.Y.W.); (L.B.); (G.-T.E.C.)
- Plant Science Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Hamidou Traore
- Institut de l’Environnement et de Recherches Agricoles (INERA), Ouagadougou 04 BP 8645, Burkina Faso; (D.Y.); (H.T.); (O.M.)
| | - Ouedraogo Margueritte
- Institut de l’Environnement et de Recherches Agricoles (INERA), Ouagadougou 04 BP 8645, Burkina Faso; (D.Y.); (H.T.); (O.M.)
| | - Binne Zwanenburg
- Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The Netherlands;
| | - Satish Ekanath Bhoge
- UPL House, Express Highway, Bandra-East, Mumbai 400 051, Maharashtra, India; (R.H.P.); (S.E.B.)
| | - Salim Al-Babili
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia; (M.J.); (J.Y.W.); (L.B.); (G.-T.E.C.)
- Plant Science Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
- Correspondence:
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Miura H, Ochi R, Nishiwaki H, Yamauchi S, Xie X, Nakamura H, Yoneyama K, Yoneyama K. Germination Stimulant Activity of Isothiocyanates on Phelipanche spp. PLANTS (BASEL, SWITZERLAND) 2022; 11:606. [PMID: 35270076 PMCID: PMC8912868 DOI: 10.3390/plants11050606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 01/10/2022] [Accepted: 02/15/2022] [Indexed: 06/14/2023]
Abstract
The root parasitic weed broomrapes, Phelipanche spp., cause severe damage to agriculture all over the world. They have a special host-dependent lifecycle and their seeds can germinate only when they receive chemical signals released from host roots. Our previous study demonstrated that 2-phenylethyl isothiocyanate is an active germination stimulant for P. ramosa in root exudates of oilseed rape. In the present study, 21 commercially available ITCs were examined for P. ramosa seed germination stimulation, and some important structural features of ITCs for exhibiting P. ramosa seed germination stimulation have been uncovered. Structural optimization of ITC for germination stimulation resulted in ITCs that are highly active to P. ramosa. Interestingly, these ITCs induced germination of P. aegyptiaca but not Orobanche minor or Striga hermonthica. P. aegyptiaca seeds collected from mature plants parasitizing different hosts responded to these ITCs with different levels of sensitivity. ITCs have the potential to be used as inducers of suicidal germination of Phelipanche seeds.
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Affiliation(s)
- Hinako Miura
- Graduate School of Agriculture, Ehime University, Matsuyama 790-8566, Japan; (H.M.); (R.O.); (H.N.); (S.Y.)
| | - Ryota Ochi
- Graduate School of Agriculture, Ehime University, Matsuyama 790-8566, Japan; (H.M.); (R.O.); (H.N.); (S.Y.)
| | - Hisashi Nishiwaki
- Graduate School of Agriculture, Ehime University, Matsuyama 790-8566, Japan; (H.M.); (R.O.); (H.N.); (S.Y.)
| | - Satoshi Yamauchi
- Graduate School of Agriculture, Ehime University, Matsuyama 790-8566, Japan; (H.M.); (R.O.); (H.N.); (S.Y.)
| | - Xiaonan Xie
- Center for Bioscience Research and Education, Utsunomiya University, Utsunomiya 321-8505, Japan; (X.X.); (K.Y.)
| | - Hidemitsu Nakamura
- Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan;
| | - Koichi Yoneyama
- Center for Bioscience Research and Education, Utsunomiya University, Utsunomiya 321-8505, Japan; (X.X.); (K.Y.)
| | - Kaori Yoneyama
- Graduate School of Agriculture, Ehime University, Matsuyama 790-8566, Japan; (H.M.); (R.O.); (H.N.); (S.Y.)
- Japan Science and Technology, PRESTO, Kawaguchi 332-0012, Japan
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Arellano-Saab A, McErlean CSP, Lumba S, Savchenko A, Stogios PJ, McCourt P. A novel strigolactone receptor antagonist provides insights into the structural inhibition, conditioning, and germination of the crop parasite Striga. J Biol Chem 2022; 298:101734. [PMID: 35181340 PMCID: PMC9035408 DOI: 10.1016/j.jbc.2022.101734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 02/12/2022] [Accepted: 02/14/2022] [Indexed: 01/14/2023] Open
Abstract
Crop parasites of the Striga genera are a major biological deterrent to food security in Africa and are one of the largest obstacles to poverty alleviation on the continent. Striga seeds germinate by sensing small-molecule hormones, strigolactones (SLs), that emanate from host roots. Although SL receptors (Striga hermonthica HYPOSENSITIVE TO LIGHT [ShHTL]) have been identified, discerning their function has been difficult because these parasites cannot be easily grown under laboratory conditions. Moreover, many Striga species are obligate outcrossers that are not transformable, hence not amenable to genetic analysis. By combining phenotypic screening with ShHTL structural information and hybrid drug discovery methods, we discovered a potent SL perception inhibitor for Striga, dormirazine (DOZ). Structural analysis of this piperazine-based antagonist reveals a novel binding mechanism, distinct from that of known SLs, blocking access of the hormone to its receptor. Furthermore, DOZ reduces the flexibility of protein–protein interaction domains important for receptor signaling to downstream partners. In planta, we show, via temporal additions of DOZ, that SL receptors are required at a specific time during seed conditioning. This conditioning is essential to prime seed germination at the right time; thus, this SL-sensitive stage appears to be critical for adequate receptor signaling. Aside from uncovering a function for ShHTL during seed conditioning, these results suggest that future Ag-Biotech Solutions to Striga infestations will need to carefully time the application of antagonists to exploit receptor availability and outcompete natural SLs, critical elements for successful parasitic plant invasions.
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Affiliation(s)
- Amir Arellano-Saab
- Department of Cell and Systems Biology, University of Toronto, 25 Willcocks Street, Toronto M5S 3B2, Canada; Department of Chemical Engineering and Applied Chemistry, University of Toronto. Toronto, ON. M5S 3E5, Canada
| | | | - Shelley Lumba
- Department of Cell and Systems Biology, University of Toronto, 25 Willcocks Street, Toronto M5S 3B2, Canada
| | - Alexei Savchenko
- Department of Chemical Engineering and Applied Chemistry, University of Toronto. Toronto, ON. M5S 3E5, Canada; Department of Microbiology, Immunology and Infectious Diseases, University of Calgary, Calgary, Alberta, Canada
| | - Peter J Stogios
- Department of Chemical Engineering and Applied Chemistry, University of Toronto. Toronto, ON. M5S 3E5, Canada
| | - Peter McCourt
- Department of Cell and Systems Biology, University of Toronto, 25 Willcocks Street, Toronto M5S 3B2, Canada
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15
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Zarban RA, Hameed UFS, Jamil M, Ota T, Wang JY, Arold ST, Asami T, Al-Babili S. Rational design of Striga hermonthica-specific seed germination inhibitors. PLANT PHYSIOLOGY 2022; 188:1369-1384. [PMID: 34850204 PMCID: PMC8825254 DOI: 10.1093/plphys/kiab547] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 10/11/2021] [Indexed: 05/20/2023]
Abstract
The obligate hemiparasitic weed Striga hermonthica grows on cereal roots and presents a severe threat to global food security by causing enormous yield losses, particularly in sub-Saharan Africa. The rapidly increasing Striga seed bank in infested soils provides a major obstacle in controlling this weed. Striga seeds require host-derived strigolactones (SLs) for germination, and corresponding antagonists could be used as germination inhibitors. Recently, we demonstrated that the common detergent Triton X-100 is a specific inhibitor of Striga seed germination by binding noncovalently to its receptor, S. hermonthica HYPO-SENSITIVE TO LIGHT 7 (ShHTL7), without blocking the rice (Oryza sativa) SL receptor DWARF14 (OsD14). Moreover, triazole ureas, the potent covalently binding antagonists of rice SL perception with much higher activity toward OsD14, showed inhibition of Striga but were less specific. Considering that Triton X-100 is not suitable for field application and by combining structural elements of Triton and triazole urea, we developed two hybrid compounds, KK023-N1 and KK023-N2, as potential Striga-specific germination inhibitors. Both compounds blocked the hydrolysis activity of ShHTL7 but did not affect that of OsD14. Binding of KK023-N1 diminished ShHTL7 interaction with S. hermonthica MORE AXILLARY BRANCHING 2, a major component in SL signal transduction, and increased ShHTL7 thermal specificity. Docking studies indicate that KK023-N1 binding is not covalent but is caused by hydrophobic interactions. Finally, in vitro and greenhouse tests revealed specific inhibition of Striga seed germination, which led to a 38% reduction in Striga infestation in pot experiments. These findings reveal that KK023-N1 is a potential candidate for combating Striga and a promising basis for rational design and development of further Striga-specific herbicides.
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Affiliation(s)
- Randa A Zarban
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, The BioActives Lab, Thuwal, 23955-6900, Saudi Arabia
| | - Umar F Shahul Hameed
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Computational Bioscience Research Center, Thuwal, 23955-6900, Saudi Arabia
| | - Muhammad Jamil
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, The BioActives Lab, Thuwal, 23955-6900, Saudi Arabia
| | - Tsuyoshi Ota
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Jian You Wang
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, The BioActives Lab, Thuwal, 23955-6900, Saudi Arabia
| | - Stefan T Arold
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Computational Bioscience Research Center, Thuwal, 23955-6900, Saudi Arabia
- Centre de Biochimie Structurale, CNRS, INSERM, Université de Montpellier, Montpellier, 34090 France
| | - Tadao Asami
- Centre de Biochimie Structurale, CNRS, INSERM, Université de Montpellier, Montpellier, 34090 France
| | - Salim Al-Babili
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, The BioActives Lab, Thuwal, 23955-6900, Saudi Arabia
- Author for communication:
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Chen Y, Kuang Y, Shi L, Wang X, Fu H, Yang S, Sampietro DA, Huang L, Yuan Y. Synthesis and Evaluation of New Halogenated GR24 Analogs as Germination Promotors for Orobanche cumana. FRONTIERS IN PLANT SCIENCE 2021; 12:725949. [PMID: 34603353 PMCID: PMC8484532 DOI: 10.3389/fpls.2021.725949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Accepted: 08/12/2021] [Indexed: 06/13/2023]
Abstract
Orobanche and Striga are parasitic weeds extremely well adapted to the life cycle of their host plants. They cannot be eliminated by conventional weed control methods. Suicidal germination induced by strigolactones (SLs) analogs is an option to control these weeds. Here, we reported two new halogenated (+)-GR24 analogs, named 7-bromo-GR24 (7BrGR24) and 7-fluoro-GR24 (7FGR24), which were synthesized using commercially available materials following simple steps. Both compounds strongly promoted seed germination of Orobanche cumana. Their EC50 values of 2.3±0.28×10-8M (7BrGR24) and 0.97±0.29×10-8M (7FGR24) were 3- and 5-fold lower, respectively, than those of (+)-GR24 and rac-GR24 (EC50=5.1±1.32-5.3±1.44×10-8; p<0.05). The 7FGR24 was the strongest seed germination promoter tested, with a stimulation percentage of 62.0±9.1% at 1.0×10-8M and 90.9±3.8% at 1.0×10-6M. It showed higher binding affinity (IC50=0.189±0.012μM) for the SL receptor ShHTL7 than (+)-GR24 (IC50=0.248±0.032μM), rac-GR24 (IC50=0.319±0.032μM), and 7BrGR24 (IC50=0.521±0.087μM). Molecular docking experiments indicated that the binding affinity of both halogenated analogs to the strigolactone receptor OsD14 was similar to that of (+)-GR24. Our results indicate that 7FGR24 is a promising agent for the control of parasitic weeds.
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Affiliation(s)
- Yuchao Chen
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei, China
- State Key Laboratory of Dao-di Herbs Breeding Base, National Resources Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
- Agricultural Biotechnology Center, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, China
| | - Yi Kuang
- Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-Efficiency Utilization, Zhejiang A&F University, Lin’an, China
| | - Liyang Shi
- Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-Efficiency Utilization, Zhejiang A&F University, Lin’an, China
| | - Xing Wang
- Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-Efficiency Utilization, Zhejiang A&F University, Lin’an, China
| | - Haoyu Fu
- Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-Efficiency Utilization, Zhejiang A&F University, Lin’an, China
| | - Shengxiang Yang
- Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-Efficiency Utilization, Zhejiang A&F University, Lin’an, China
| | | | - Luqi Huang
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei, China
- State Key Laboratory of Dao-di Herbs Breeding Base, National Resources Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yuan Yuan
- State Key Laboratory of Dao-di Herbs Breeding Base, National Resources Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
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17
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Andersson I, Carlsson GH, Hasse D. Structural Analysis of Strigolactone-Related Gene Products. Methods Mol Biol 2021; 2309:245-257. [PMID: 34028692 DOI: 10.1007/978-1-0716-1429-7_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Structural knowledge of biological macromolecules is essential for understanding their function and for modifying that function by engineering. Protein crystallography is a powerful method for elucidating molecular structures of proteins, but it is essential that the investigator has a basic knowledge of good practices and of the major pitfalls in the technique. Here we describe issues specific for the case of structural studies of strigolactone (SL) receptor structure and function, and in particular the difficulties associated with capturing complexes of SL receptors with the SL hormone ligand in the crystal.
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Affiliation(s)
- Inger Andersson
- Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Uppsala, Sweden. .,Arctic University of Norway, Tromsø, Norway. .,Institute of Biotechnology of the Czech Academy of Sciences, BIOCEV, Vestec, Czech Republic.
| | - Gunilla H Carlsson
- Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Uppsala, Sweden
| | - Dirk Hasse
- Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Uppsala, Sweden
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18
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Strigolactones, from Plants to Human Health: Achievements and Challenges. Molecules 2021; 26:molecules26154579. [PMID: 34361731 PMCID: PMC8348160 DOI: 10.3390/molecules26154579] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 07/24/2021] [Accepted: 07/27/2021] [Indexed: 12/17/2022] Open
Abstract
Strigolactones (SLs) are a class of sesquiterpenoid plant hormones that play a role in the response of plants to various biotic and abiotic stresses. When released into the rhizosphere, they are perceived by both beneficial symbiotic mycorrhizal fungi and parasitic plants. Due to their multiple roles, SLs are potentially interesting agricultural targets. Indeed, the use of SLs as agrochemicals can favor sustainable agriculture via multiple mechanisms, including shaping root architecture, promoting ideal branching, stimulating nutrient assimilation, controlling parasitic weeds, mitigating drought and enhancing mycorrhization. Moreover, over the last few years, a number of studies have shed light onto the effects exerted by SLs on human cells and on their possible applications in medicine. For example, SLs have been demonstrated to play a key role in the control of pathways related to apoptosis and inflammation. The elucidation of the molecular mechanisms behind their action has inspired further investigations into their effects on human cells and their possible uses as anti-cancer and antimicrobial agents.
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19
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Braguy J, Ramazanova M, Giancola S, Jamil M, Kountche BA, Zarban R, Felemban A, Wang JY, Lin PY, Haider I, Zurbriggen M, Ghanem B, Al-Babili S. SeedQuant: a deep learning-based tool for assessing stimulant and inhibitor activity on root parasitic seeds. PLANT PHYSIOLOGY 2021; 186:1632-1644. [PMID: 33856485 PMCID: PMC8260127 DOI: 10.1093/plphys/kiab173] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 03/25/2021] [Indexed: 05/20/2023]
Abstract
Witchweeds (Striga spp.) and broomrapes (Orobanchaceae and Phelipanche spp.) are root parasitic plants that infest many crops in warm and temperate zones, causing enormous yield losses and endangering global food security. Seeds of these obligate parasites require rhizospheric, host-released stimulants to germinate, which opens up possibilities for controlling them by applying specific germination inhibitors or synthetic stimulants that induce lethal germination in the host's absence. To determine their effect on germination, root exudates or synthetic stimulants/inhibitors are usually applied to parasitic seeds in in vitro bioassays, followed by assessment of germination ratios. Although these protocols are very sensitive, the germination recording process is laborious, representing a challenge for researchers and impeding high-throughput screens. Here, we developed an automatic seed census tool to count and discriminate germinated seeds (GS) from non-GS. We combined deep learning, a powerful data-driven framework that can accelerate the procedure and increase its accuracy, for object detection with computer vision latest development based on the Faster Region-based Convolutional Neural Network algorithm. Our method showed an accuracy of 94% in counting seeds of Striga hermonthica and reduced the required time from approximately 5 min to 5 s per image. Our proposed software, SeedQuant, will be of great help for seed germination bioassays and enable high-throughput screening for germination stimulants/inhibitors. SeedQuant is an open-source software that can be further trained to count different types of seeds for research purposes.
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Affiliation(s)
- Justine Braguy
- Division of Biological and Environmental Science and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
- Institute of Synthetic Biology and CEPLAS, University of Düsseldorf, Düsseldorf 40225, Germany
| | - Merey Ramazanova
- Division of Computer, Electrical and Mathematical Science and Engineering, Image and Video Understanding Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Silvio Giancola
- Division of Computer, Electrical and Mathematical Science and Engineering, Image and Video Understanding Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Muhammad Jamil
- Division of Biological and Environmental Science and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Boubacar A Kountche
- Division of Biological and Environmental Science and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Randa Zarban
- Division of Biological and Environmental Science and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Abrar Felemban
- Division of Biological and Environmental Science and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Jian You Wang
- Division of Biological and Environmental Science and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Pei-Yu Lin
- Division of Biological and Environmental Science and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Imran Haider
- Division of Biological and Environmental Science and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Matias Zurbriggen
- Institute of Synthetic Biology and CEPLAS, University of Düsseldorf, Düsseldorf 40225, Germany
| | - Bernard Ghanem
- Division of Computer, Electrical and Mathematical Science and Engineering, Image and Video Understanding Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Salim Al-Babili
- Division of Biological and Environmental Science and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
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20
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Okazawa A, Samejima H, Kitani S, Sugimoto Y, Ohta D. Germination stimulatory activity of bacterial butenolide hormones from Streptomyces albus J1074 on seeds of the root parasitic weed Orobanche minor. JOURNAL OF PESTICIDE SCIENCE 2021; 46:242-247. [PMID: 34135687 PMCID: PMC8175218 DOI: 10.1584/jpestics.d21-014] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 03/17/2021] [Indexed: 06/12/2023]
Abstract
Damage caused by Orobanchaceae root parasitic weeds is a substantial agricultural problem for global food security. Many studies have been conducted to establish practical methods of control, but efforts are still required for successful management. Seed germination of root parasitic weeds requires host-derived germination stimulants including strigolactones (SLs). Studies on SLs have revealed that a butenolide ring is the essential moiety for SL activity as a germination stimulant. Interestingly, recent studies have revealed that butenolide hormones regulate the biosynthesis of secondary metabolites and mediate communication in actinomycete bacteria. Because of the structural similarity between SLs and the bacterial butenolides, we evaluated the germination stimulatory activity of butenolides isolated from Streptomyces albus J1074 on root parasitic weeds. These butenolides were found to specifically induce seed germination of Orobanche minor. Our findings contribute to understanding the molecular mechanisms of germination stimulant perception and to the development of a method for their biological control.
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Affiliation(s)
- Atsushi Okazawa
- Department of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka 599–8531, Japan
| | - Hiroaki Samejima
- Department of Agrobioscience, Graduate School of Agricultural Sciences, Kobe University, Kobe, Hyogo 657–8501, Japan
| | - Shigeru Kitani
- International Center for Biotechnology, Osaka University, Suita Osaka 565–0871, Japan
| | - Yukihiro Sugimoto
- Department of Agrobioscience, Graduate School of Agricultural Sciences, Kobe University, Kobe, Hyogo 657–8501, Japan
| | - Daisaku Ohta
- Department of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka 599–8531, Japan
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21
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Jamil M, Kountche BA, Al-Babili S. Current progress in Striga management. PLANT PHYSIOLOGY 2021; 185:1339-1352. [PMID: 33793943 PMCID: PMC8133620 DOI: 10.1093/plphys/kiab040] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 01/18/2021] [Indexed: 05/20/2023]
Abstract
The Striga, particularly S. he rmonthica, problem has become a major threat to food security, exacerbating hunger and poverty in many African countries. A number of Striga control strategies have been proposed and tested during the past decade, however, further research efforts are still needed to provide sustainable and effective solutions to the Striga problem. In this paper, we provide an update on the recent progress and the approaches used in Striga management, and highlight emerging opportunities for developing new technologies to control this enigmatic parasite.
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Affiliation(s)
- Muhammad Jamil
- Division of Biological and Environmental Sciences and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Boubacar A Kountche
- Division of Biological and Environmental Sciences and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Salim Al-Babili
- Division of Biological and Environmental Sciences and Engineering, the BioActives Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
- Author for communication:
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22
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Yacoubou A, Zoumarou Wallis N, Menkir A, Zinsou VA, Onzo A, Garcia‐Oliveira AL, Meseka S, Wende M, Gedil M, Agre P. Breeding maize ( Zea mays) for Striga resistance: Past, current and prospects in sub-saharan africa. PLANT BREEDING = ZEITSCHRIFT FUR PFLANZENZUCHTUNG 2021; 140:195-210. [PMID: 34239217 PMCID: PMC8248382 DOI: 10.1111/pbr.12896] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 12/21/2020] [Indexed: 05/21/2023]
Abstract
Striga hermonthica, causes up to 100% yield loss in maize production in Sub-Saharan Africa. Developing Striga-resistant maize cultivars could be a major component of integrated Striga management strategies. This paper presents a comprehensive overview of maize breeding activities related to Striga resistance and its management. Scientific surveys have revealed that conventional breeding strategies have been used more than molecular breeding strategies in maize improvement for Striga resistance. Striga resistance genes are still under study in the International Institute for Tropical Agriculture (IITA) maize breeding programme. There is also a need to discover QTL and molecular markers associated with such genes to improve Striga resistance in maize. Marker Assistance Breeding is expected to increase maize breeding efficiency with complex traits such as resistance towards Striga because of the complex nature of the host-parasite relationship and its intersection with other environmental factors. Conventional alongside molecular tools and technical controls are promising methods to effectively assess Striga in Sub-Saharan Africa.
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Affiliation(s)
- Abdoul‐Madjidou Yacoubou
- Laboratoire de Phytotechnie, d’Amélioration et de Protection des Plantes (LaPAPP)Département des Sciences et Techniques de Production Végétale (STPV)Faculté d’AgronomieUniversité de ParakouParakouBénin
- International Institute of Tropical Agriculture (IITA)Oyo RoadPMB 5320IbadanNigeria
- Institut National des Recherches Agricoles du Bénin01 BP 884CotonouBénin
| | - Nouhoun Zoumarou Wallis
- Laboratoire de Phytotechnie, d’Amélioration et de Protection des Plantes (LaPAPP)Département des Sciences et Techniques de Production Végétale (STPV)Faculté d’AgronomieUniversité de ParakouParakouBénin
| | - Abebe Menkir
- International Institute of Tropical Agriculture (IITA)Oyo RoadPMB 5320IbadanNigeria
| | - Valerien A. Zinsou
- Laboratoire de Phytotechnie, d’Amélioration et de Protection des Plantes (LaPAPP)Département des Sciences et Techniques de Production Végétale (STPV)Faculté d’AgronomieUniversité de ParakouParakouBénin
| | - Alexis Onzo
- Laboratoire de Phytotechnie, d’Amélioration et de Protection des Plantes (LaPAPP)Département des Sciences et Techniques de Production Végétale (STPV)Faculté d’AgronomieUniversité de ParakouParakouBénin
| | | | - Silvestro Meseka
- International Institute of Tropical Agriculture (IITA)Oyo RoadPMB 5320IbadanNigeria
| | - Mengesha Wende
- International Institute of Tropical Agriculture (IITA)Oyo RoadPMB 5320IbadanNigeria
| | - Melaku Gedil
- International Institute of Tropical Agriculture (IITA)Oyo RoadPMB 5320IbadanNigeria
| | - Paterne Agre
- International Institute of Tropical Agriculture (IITA)Oyo RoadPMB 5320IbadanNigeria
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23
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On improving strigolactone mimics for induction of suicidal germination of the root parasitic plant Striga hermonthica. ABIOTECH 2021; 2:1-13. [PMID: 36304477 PMCID: PMC9590581 DOI: 10.1007/s42994-020-00031-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 10/10/2020] [Indexed: 10/23/2022]
Abstract
Strigolactones (SLs) are plant hormones that regulate the branching of plants and seed germination stimulants of root parasitic plants. As root parasites are a great threat to agricultural production, the use of SL agonists could be anticipated to provide an efficient method for regulating root parasites as suicidal germination inducers. A series of phenoxyfuranone-type SL mimics, termed debranones, has been reported to show potent bioactivities, including reduction of the tiller number on rice, and stimulation of seed germination in the root parasite Striga hermonthica. To exert both activities, two substituents on the phenyl ring of the molecules were important but at least a substituent at the 2-position must be an electron-withdrawing group. However, little is known about the effect of the properties of the substituents at the 2-position on bioactivities. Here, we found that different substituents at the 2-position give different preferences for bioactivities. Halogenated debranones were more effective than the others and SL agonist GR24 for inhibiting rice tiller but far less effective in the induction of S. hermonthica germination. Meanwhile, nitrile and methyl derivatives clearly stimulated the germination of S. hermonthica seeds. Although their IC50 values were 100 times higher than that of GR24 in the receptor competitive binding assay, their physiological activities were approximately 1/10 of GR24. These differences could be due to their uptake in plants and/or their physicochemical stability under our experimental conditions. These findings could support the design of more potent and selective SL agonists that could contribute to solving big agricultural issues.
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24
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Johnson JL, Santoro E, Zatout R, Petrovic AG, Cimmino A, Superchi S, Evidente A, Berova ND, Polavarapu PL. Absolute configuration of seco-eudesmanolide inuloxin D from experimental and predicted chiroptical studies of its 4-O-acetyl derivative. Chirality 2021; 33:233-241. [PMID: 33598968 DOI: 10.1002/chir.23301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 02/05/2021] [Accepted: 02/08/2021] [Indexed: 12/12/2022]
Abstract
Sesquitepenoids inuloxins A-D, belonging to different subgroups, were isolated from Dittrichia viscosa and showed potential biocontrol of some parasitic plants as Pelipanche, Orobanche, and Cuscuta species. The absolute configurations of the first three inuloxins A-C were previously determined by using experimental and computational chiroptical spectroscopic methods. The absolute configuration of inuloxin D remains to be established. The bioactive inuloxin E, closely related to inuloxin D, was recently isolated from the same plant organic extract. The same relative configuration of inuloxin D was assigned to inuloxin E by comparison of their NMR spectroscopic data. The absolute configurations of inuloxin D and inuloxin E are suggested in this work by analysis of the experimental and predicted chiroptical properties of the 4-O-acetyl derivative of inuloxin D.
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Affiliation(s)
- Jordan L Johnson
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee, USA
| | - Ernesto Santoro
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee, USA
| | - Roukia Zatout
- Department of chemical Sciences, University of Naples Federico II, Naples, Italy.,Laboratoire de Mycologie, de Biotechnologie et de l'Activité Microbienne (LaMyBAM), Département de Biologie Appliquée, Université des Frères Mentouri, Constantine, Algeria
| | - Ana G Petrovic
- Department of Chemical and Biological Sciences, New York Institute of Technology, New York, New York, USA
| | - Alessio Cimmino
- Department of chemical Sciences, University of Naples Federico II, Naples, Italy
| | | | - Antonio Evidente
- Department of chemical Sciences, University of Naples Federico II, Naples, Italy
| | - Nina D Berova
- Department of Chemistry, Columbia University, New York, New York, USA
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25
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Blanco-Ania D, Zwanenburg B. Synthesis of Analogs of Strigolactones and Evaluation of Their Stability in Solution. Methods Mol Biol 2021; 2309:37-55. [PMID: 34028678 DOI: 10.1007/978-1-0716-1429-7_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Strigolactones (SLs) are new plant hormones that play an important role in the control development of plants. They are germination stimulants for seed of parasitic weeds, are the branching factor of arbuscular mycorrhizal fungi and inhibitors for bud outgrowth and shoot branching. Natural SLs contain an annulated system of three rings (ABC scaffold) connected to a furanone (the D-ring) by an enol ether unit. The natural distribution of strigolactones is low, and their synthesis is long and difficult. Therefore, SL analogs are designed to have the same bioactiphore as natural SLs and an appreciable bioactivity. For the design a model is used based on the natural bioactiphore. Typical SL analogs are GR24, Nijmegen-1, and EM1 (derived from ethyl 2-phenylacetate). The synthesis of these SL analogs is reported together with their stability in aqueous solution.
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Affiliation(s)
- Daniel Blanco-Ania
- Department of Organic Chemistry, Radboud University Nijmegen, Institute for Molecules and Materials, Nijmegen, The Netherlands
| | - Binne Zwanenburg
- Department of Organic Chemistry, Radboud University Nijmegen, Institute for Molecules and Materials, Nijmegen, The Netherlands.
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26
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Pang Z, Zhang X, Ma F, Liu J, Zhang H, Wang J, Wen X, Xi Z. Comparative Studies of Potential Binding Pocket Residues Reveal the Molecular Basis of ShHTL Receptors in the Perception of GR24 in Striga. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:12729-12737. [PMID: 33125848 DOI: 10.1021/acs.jafc.0c04947] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Root parasitic weeds such as Striga spp. have caused significant losses in agriculture production worldwide. The seed germination of the weeds depends on strigolactones (SLs) that target a series of HYPOSENSITIVE TO LIGHT/KARRIKIN INSENSITIVE2 in Striga hermonthica (ShHTL) proteins. In the present study, 60 ShHTL7 mutants were constructed, and the equilibrium dissociation constants for GR24 (a synthetic SL analogue, commonly used as a standard in SL germination studies) against these mutants were measured by surface plasmon resonance. Based on these data, the SL binding pocket residues were distinguished. Of them, some specific residues for ShHTL7 were found, such as T142, T190, and M219. A model showing quite well internal and external predictive abilities was established by the mutation-dependent biomacromolecular quantitative structure-activity relationship method. It provided an expanded understanding for GR24 binding to a series of ShHTL receptors and should help design broad-spectrum agrochemicals with cross interactions with several members of SL receptors.
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Affiliation(s)
- Zhili Pang
- State Key Laboratory of Elemento-Organic Chemistry and Department of Chemical Biology, National Pesticide Engineering Research Center (Tianjin), Nankai University, Tianjin 300071, China
| | - Xu Zhang
- State Key Laboratory of Elemento-Organic Chemistry and Department of Chemical Biology, National Pesticide Engineering Research Center (Tianjin), Nankai University, Tianjin 300071, China
| | - Fulei Ma
- State Key Laboratory of Elemento-Organic Chemistry and Department of Chemical Biology, National Pesticide Engineering Research Center (Tianjin), Nankai University, Tianjin 300071, China
| | - Junliang Liu
- State Key Laboratory of Elemento-Organic Chemistry and Department of Chemical Biology, National Pesticide Engineering Research Center (Tianjin), Nankai University, Tianjin 300071, China
| | - Hang Zhang
- State Key Laboratory of Elemento-Organic Chemistry and Department of Chemical Biology, National Pesticide Engineering Research Center (Tianjin), Nankai University, Tianjin 300071, China
| | - Jing Wang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100871, China
| | - Xin Wen
- State Key Laboratory of Elemento-Organic Chemistry and Department of Chemical Biology, National Pesticide Engineering Research Center (Tianjin), Nankai University, Tianjin 300071, China
| | - Zhen Xi
- State Key Laboratory of Elemento-Organic Chemistry and Department of Chemical Biology, National Pesticide Engineering Research Center (Tianjin), Nankai University, Tianjin 300071, China
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27
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Chesterfield RJ, Vickers CE, Beveridge CA. Translation of Strigolactones from Plant Hormone to Agriculture: Achievements, Future Perspectives, and Challenges. TRENDS IN PLANT SCIENCE 2020; 25:1087-1106. [PMID: 32660772 DOI: 10.1016/j.tplants.2020.06.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 06/04/2020] [Accepted: 06/10/2020] [Indexed: 05/21/2023]
Abstract
Strigolactones (SLs) control plant development, enhance symbioses, and act as germination stimulants for some of the most destructive species of parasitic weeds, making SLs a potential tool to improve crop productivity and resilience. Field trials demonstrate the potential use of SLs as agrochemicals or genetic targets in breeding programs, with applications in improving drought tolerance, increasing yields, and controlling parasitic weeds. However, for effective translation of SLs into agriculture, understanding and exploiting SL diversity and the development of economically viable sources of SL analogs will be critical. Here we review how manipulation of SL signaling can be used when developing new tools and crop varieties to address some critical challenges, such as nutrient acquisition, resource allocation, stress tolerance, and plant-parasite interactions.
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Affiliation(s)
- Rebecca J Chesterfield
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia; Synthetic Biology Future Science Platform, CSIRO, Australia
| | - Claudia E Vickers
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia; Synthetic Biology Future Science Platform, CSIRO, Australia.
| | - Christine A Beveridge
- School of Biological Sciences, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
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28
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Gautier C, Martinez L, Fournet S, Montarry J, Yvin JC, Nguema-Ona E, Guillerm-Erckelboudt AY, Piriou C, Linglin J, Mougel C, Lebreton L. Hatching of Globodera pallida Induced by Root Exudates Is Not Influenced by Soil Microbiota Composition. Front Microbiol 2020; 11:536932. [PMID: 33133028 PMCID: PMC7578397 DOI: 10.3389/fmicb.2020.536932] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 09/16/2020] [Indexed: 01/04/2023] Open
Abstract
Plant-parasitic nematodes are among the most harmful pests of cultivated crops causing important economic losses. The ban of chemical nematicides requires the development of alternative agroecological approaches to protect crops against nematodes. For cyst nematodes, egg hatching is stimulated by host plant root exudates. Inducing "suicide hatching" of nematode second-stage juveniles (J2), using root exudates in the absence of the host plant, may constitute an effective and innovative biocontrol method to control cyst nematodes. However, before considering the development of this approach, understanding the effect of soil biotic component on cyst nematode hatching by root exudates is a major issue. The effectiveness of this approach could be modulated by other soil organisms consuming root exudates for growth as soil microbiota, and this must be evaluated. To do that, four different native agricultural soils were selected based on their physicochemical properties and their microbiota composition were characterized by rDNA metabarcoding. To disentangle the effect of microbiota from that of soil on hatching, four recolonized artificial soils were obtained by inoculating a common sterile soil matrix with the microbiota proceeding from each agricultural soil. Each soil was then inoculated with cysts of the potato cyst nematode, Globodera pallida, and low or high doses of potato root exudates (PREs) were applied. After 40 days, viable J2 remaining in cysts were counted to determine the efficiency of root exudates to stimulate hatching in different soils. Results showed that (i) when physicochemical and microbiota compositions varied among native soils, the hatching rates remained very high albeit small differences were measured and no dose effect was detected and (ii) when only microbiota composition varied among recolonized soils, the hatching rates were also high at the highest dose of PREs, but a strong dose effect was highlighted. This study shows that abiotic and biotic factors may not compromise the development of methods based on suicide hatching of cyst nematodes, using root exudates, molecules inducing J2 hatch, or trap crops.
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Affiliation(s)
- Camille Gautier
- Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE), UMR1349 IGEPP, Institute of Genetic Environment and Plant Protection, Le Rheu, France
- Centre Mondial de l’Innovation-Roullier, Laboratoire de Nutrition Végétale - Pôle Stress Biotique, Saint Malo, France
| | - Lisa Martinez
- Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE), UMR1349 IGEPP, Institute of Genetic Environment and Plant Protection, Le Rheu, France
| | - Sylvain Fournet
- Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE), UMR1349 IGEPP, Institute of Genetic Environment and Plant Protection, Le Rheu, France
| | - Josselin Montarry
- Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE), UMR1349 IGEPP, Institute of Genetic Environment and Plant Protection, Le Rheu, France
| | - Jean-Claude Yvin
- Centre Mondial de l’Innovation-Roullier, Laboratoire de Nutrition Végétale - Pôle Stress Biotique, Saint Malo, France
| | - Eric Nguema-Ona
- Centre Mondial de l’Innovation-Roullier, Laboratoire de Nutrition Végétale - Pôle Stress Biotique, Saint Malo, France
| | - Anne-Yvonne Guillerm-Erckelboudt
- Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE), UMR1349 IGEPP, Institute of Genetic Environment and Plant Protection, Le Rheu, France
| | - Christophe Piriou
- Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE), UMR1349 IGEPP, Institute of Genetic Environment and Plant Protection, Le Rheu, France
| | - Juliette Linglin
- Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE), UMR1349 IGEPP, Institute of Genetic Environment and Plant Protection, Ploudaniel, France
| | - Christophe Mougel
- Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE), UMR1349 IGEPP, Institute of Genetic Environment and Plant Protection, Le Rheu, France
| | - Lionel Lebreton
- Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE), UMR1349 IGEPP, Institute of Genetic Environment and Plant Protection, Le Rheu, France
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29
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Kang Y, Pang Z, Xu N, Chen F, Jin Z, Xu X. Strigolactone Analogues Derived from Dihydroflavonoids as Potent Seed Germinators for the Broomrapes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:11077-11087. [PMID: 32924502 DOI: 10.1021/acs.jafc.9b08044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The broomrapes (Orobanche and Phelipanche spp.) and witchweeds (Striga spp.) are a class of parasitic weeds, which are distributed widely in the tropical, subtropical, and temperate areas of the globe. Since they have completely consistent lifecycles with the host plants, it is difficult to control them selectively through using the conventional herbicides. Inducing suicidal germination of these weed seeds by small molecular signaling agents proved to be a promising strategy for the management of parasitic weeds. As a class of naturally occurring terpenoid metabolites, strigolactones (SLs) show significant biological activities including stimulation germination of weed seeds, inhibition of shoot-branching, and so on. However, the widespread application of these natural SLs is greatly limited by their extremely low natural abundance and complex molecular structures. Design and synthesis of the simplified analogues as natural SLs alternatives provide a viable avenue for the efficient control of these parasitic weeds. We herein disclose the development of a novel class of SLs analogues derived from dihydroflavonoids as potent seed germinators of parasitic weeds. It was shown that one of them displayed a higher potential toward the seed germination of the broomrapes than the positive control GR24. The structure-activity relationship of these SLs analogues was further validated on the basis of the binding affinity experiment to strigolactone receptor protein HTL7 by using a YLG fluorescent probe method.
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Affiliation(s)
- Yunyao Kang
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zhili Pang
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Niuniu Xu
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Fangjie Chen
- College of Forestry, Northwest Agriculture & Forest University, Xianyang 712100, Shanxi Province, China
| | - Zhong Jin
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xiaohua Xu
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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30
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Floková K, Shimels M, Andreo Jimenez B, Bardaro N, Strnad M, Novák O, Bouwmeester HJ. An improved strategy to analyse strigolactones in complex sample matrices using UHPLC-MS/MS. PLANT METHODS 2020; 16:125. [PMID: 32963580 PMCID: PMC7499983 DOI: 10.1186/s13007-020-00669-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 09/08/2020] [Indexed: 05/23/2023]
Abstract
BACKGROUND Strigolactones represent the most recently described group of plant hormones involved in many aspects of plant growth regulation. Simultaneously, root exuded strigolactones mediate rhizosphere signaling towards beneficial arbuscular mycorrhizal fungi, but also attract parasitic plants. The seed germination of parasitic plants induced by host strigolactones leads to serious agricultural problems worldwide. More insight in these signaling molecules is hampered by their extremely low concentrations in complex soil and plant tissue matrices, as well as their instability. So far, the combination of tailored isolation-that would replace current unspecific, time-consuming and labour-intensive processing of large samples-and a highly sensitive method for the simultaneous profiling of a broad spectrum of strigolactones has not been reported. RESULTS Depending on the sample matrix, two different strategies for the rapid extraction of the seven structurally similar strigolactones and highly efficient single-step pre-concentration on polymeric RP SPE sorbent were developed and validated. Compared to conventional methods, controlled temperature during the extraction and the addition of an organic modifier (acetonitrile, acetone) to the extraction solvent helped to tailor strigolactone isolation from low initial amounts of root tissue (150 mg fresh weight, FW) and root exudate (20 ml), which improved both strigolactone stability and sample purity. We have designed an efficient UHPLC separation with sensitive MS/MS detection for simultaneous analysis of seven natural strigolactones including their biosynthetic precursors-carlactone and carlactonoic acid. In combination with the optimized UHPLC-MS/MS method, attomolar detection limits were achieved. The new method allowed successful profiling of seven strigolactones in small exudate and root tissue samples of four different agriculturally important plant species-sorghum, rice, pea and tomato. CONCLUSION The established method provides efficient strigolactone extraction with aqueous mixtures of less nucleophilic organic solvents from small root tissue and root exudate samples, in combination with rapid single-step pre-concentration. This method improves strigolactone stability and eliminates the co-extraction and signal of matrix-associated contaminants during the final UHPLC-MS/MS analysis with an electrospray interface, which dramatically increases the overall sensitivity of the analysis. We show that the method can be applied to a variety of plant species.
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Affiliation(s)
- Kristýna Floková
- Plant Hormone Biology Group, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
- Laboratory of Growth Regulators, Institute of Experimental Botany, The Czech Academy of Sciences, and Faculty of Science, Palacký University, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Mahdere Shimels
- Laboratory of Plant Physiology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
- Department of Microbial Ecology, Netherlands Institute of Ecology, Droevendaalsesteeg 10, 6708 PB Wageningen, The Netherlands
| | - Beatriz Andreo Jimenez
- Laboratory of Plant Physiology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
- Biointeractions and Plant Health, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
| | - Nicoletta Bardaro
- Department of Plant, Soil and Food Science, Section of Genetics and Plant Breeding, University of Bari, Via Amendola 165/A, 70126 Bari, Italy
| | - Miroslav Strnad
- Laboratory of Growth Regulators, Institute of Experimental Botany, The Czech Academy of Sciences, and Faculty of Science, Palacký University, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Ondřej Novák
- Laboratory of Growth Regulators, Institute of Experimental Botany, The Czech Academy of Sciences, and Faculty of Science, Palacký University, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Harro J. Bouwmeester
- Plant Hormone Biology Group, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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31
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Zorrilla JG, Cala A, Rial C, R Mejías FJ, Molinillo JMG, Varela RM, Macías FA. Synthesis of Active Strigolactone Analogues Based on Eudesmane- and Guaiane-Type Sesquiterpene Lactones. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:9636-9645. [PMID: 32794743 DOI: 10.1021/acs.jafc.0c02361] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Strigolactones are natural products that are exuded by plants and stimulate parasitic weed germination. Their use in herbicides is limited since they are produced in small quantities, but the synthesis of bioactive analogues provides an alternative source. In this work, eleven analogues have been synthesized. Among them, nine compounds belong to a novel family named eudesmanestrigolactones. The procedure is short (3-6 steps), the starting materials are isolated on a multigram scale, and global yields are up to 8%, which significantly enhance isolated yields. In bioassay, the compounds germinated high percentages of Phelipanche ramosa, Orobanche cumana, and Orobanche crenata seeds, even at nanogram doses (100 nM). Bioactivity was stereochemistry-dependent, and it was discussed in terms of the presence and geometry of the enol ether, orientation of the butenolide, and unsaturation of ring A. The reported compounds provide a set of readily obtained allelochemicals with potential applications as preventive herbicides.
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Affiliation(s)
- Jesús G Zorrilla
- Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus CEIA3, School of Science, University of Cadiz, C/Republica Saharaui, 7, 11510 Puerto Real, Cádiz, Spain
| | - Antonio Cala
- Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus CEIA3, School of Science, University of Cadiz, C/Republica Saharaui, 7, 11510 Puerto Real, Cádiz, Spain
| | - Carlos Rial
- Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus CEIA3, School of Science, University of Cadiz, C/Republica Saharaui, 7, 11510 Puerto Real, Cádiz, Spain
| | - Francisco J R Mejías
- Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus CEIA3, School of Science, University of Cadiz, C/Republica Saharaui, 7, 11510 Puerto Real, Cádiz, Spain
| | - José M G Molinillo
- Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus CEIA3, School of Science, University of Cadiz, C/Republica Saharaui, 7, 11510 Puerto Real, Cádiz, Spain
| | - Rosa M Varela
- Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus CEIA3, School of Science, University of Cadiz, C/Republica Saharaui, 7, 11510 Puerto Real, Cádiz, Spain
| | - Francisco A Macías
- Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus CEIA3, School of Science, University of Cadiz, C/Republica Saharaui, 7, 11510 Puerto Real, Cádiz, Spain
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Chesterfield RJ, Whitfield JH, Pouvreau B, Cao D, Alexandrov K, Beveridge CA, Vickers CE. Rational Design of Novel Fluorescent Enzyme Biosensors for Direct Detection of Strigolactones. ACS Synth Biol 2020; 9:2107-2118. [PMID: 32786922 DOI: 10.1021/acssynbio.0c00192] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Strigolactones are plant hormones and rhizosphere signaling molecules with key roles in plant development, mycorrhizal fungal symbioses, and plant parasitism. Currently, sensitive, specific, and high-throughput methods of detecting strigolactones are limited. Here, we developed genetically encoded fluorescent strigolactone biosensors based on the strigolactone receptors DAD2 from Petunia hybrida, and HTL7 from Striga hermonthica. The biosensors were constructed via domain insertion of circularly permuted GFP. The biosensors exhibited loss of cpGFP fluorescence in vitro upon treatment with the strigolactones 5-deoxystrigol and orobanchol, or the strigolactone analogue rac-GR24, and the ShHTL7 biosensor also responded to a specific antagonist. To overcome biosensor sensitivity to changes in expression level and protein degradation, an additional strigolactone-insensitive fluorophore, LSSmOrange, was included as an internal normalization control. Other plant hormones and karrikins resulted in no fluorescence change, demonstrating that the biosensors report on compounds that specifically bind the SL receptors. The DAD2 biosensor likewise responded to strigolactones in an in vivo protoplast system, and retained strigolactone hydrolysis activity. These biosensors have applications in high-throughput screening for agrochemical compounds, and may also have utility in understanding strigolactone mediated signaling in plants.
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Affiliation(s)
- Rebecca J. Chesterfield
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
- Synthetic Biology Future Science Platform, CSIRO, Black Mountain, ACT 2601, Australia
| | - Jason H. Whitfield
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
- Synthetic Biology Future Science Platform, CSIRO, Dutton Park, QLD 4001, Australia
| | - Benjamin Pouvreau
- Synthetic Biology Future Science Platform, CSIRO, Black Mountain, ACT 2601, Australia
| | - Da Cao
- School of Biological Sciences, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
| | - Kirill Alexandrov
- Synthetic Biology Future Science Platform, CSIRO, Dutton Park, QLD 4001, Australia
- CSIRO-QUT Synthetic Biology Alliance, ARC Centre of Excellence in Synthetic Biology, Centre for Agriculture and the Bioeconomy, Institute of Health and Biomedical Innovation, Institute for Future Environments, School of Biology and Environmental Science, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Christine A. Beveridge
- School of Biological Sciences, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
| | - Claudia E. Vickers
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
- Synthetic Biology Future Science Platform, CSIRO, Dutton Park, QLD 4001, Australia
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Aliche EB, Screpanti C, De Mesmaeker A, Munnik T, Bouwmeester HJ. Science and application of strigolactones. THE NEW PHYTOLOGIST 2020; 227:1001-1011. [PMID: 32067235 PMCID: PMC7384091 DOI: 10.1111/nph.16489] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 02/11/2020] [Indexed: 05/16/2023]
Abstract
Strigolactones (SLs) represent a class of plant hormones that regulate developmental processes and play a role in the response of plants to various biotic and abiotic stresses. Both in planta hormonal roles and ex planta signalling effects of SLs are potentially interesting agricultural targets. In this review, we explore various aspects of SL function and highlight distinct areas of agriculture that may benefit from the use of synthetic SL analogues, and we identify possible bottlenecks. Our objective is to identify where the contributions of science and stakeholders are still needed to achieve harnessing the benefits of SLs for a sustainable agriculture of the near future.
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Affiliation(s)
- Ernest B. Aliche
- Plant Hormone BiologySwammerdam Institute for Life SciencesUniversity of AmsterdamScience Park 904Amsterdam1098 XHthe Netherlands
| | - Claudio Screpanti
- Chemical ResearchSyngenta Crop Protection AGSchaffhausenstrasse 101CH‐4332SteinSwitzerland
| | - Alain De Mesmaeker
- Chemical ResearchSyngenta Crop Protection AGSchaffhausenstrasse 101CH‐4332SteinSwitzerland
| | - Teun Munnik
- Plant Cell BiologySwammerdam Institute for Life SciencesUniversity of AmsterdamScience Park 904Amsterdam1098 XHthe Netherlands
| | - Harro J. Bouwmeester
- Plant Hormone BiologySwammerdam Institute for Life SciencesUniversity of AmsterdamScience Park 904Amsterdam1098 XHthe Netherlands
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Rial C, Tomé S, Varela RM, Molinillo JMG, Macías FA. Phytochemical Study of Safflower Roots (Carthamus tinctorius) on the Induction of Parasitic Plant Germination and Weed Control. J Chem Ecol 2020; 46:871-880. [DOI: 10.1007/s10886-020-01200-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Revised: 06/21/2020] [Accepted: 07/12/2020] [Indexed: 12/18/2022]
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Abstract
The parasitic plant Striga hermonthica (Delile) Benth. is stimulated to germinate by biomolecules (strigolactones) produced in the roots of host and some non-host plants. Non-hosts induce Striga’s suicidal germination and are therefore used as trap crops. Among trap crops, the Slenderleaf legume in the genus Crotalaria (Crotalaria brevidens (L.) Benth.) and (Crotalaria orchroleuca (G.) Don.) has been popularized in African smallholder farms. However, the Striga germination efficiency of these locally grown Crotalaria varieties (landraces) is unknown. Also unclear is Crotolaria’s extent to inhibiting Striga growth, post germination. Extensive parasite penetration can expose the trap crop to secondary infections and possible phytotoxicity from Striga. We used in vitro germination assays to determine the Striga germination efficiency of 29 Crotalaria landraces. Furthermore, we determined Crotalaria’s ability to inhibit Striga attachment and growth using histological analysis. We found that: i) Crotalaria stimulated germination of Striga seeds at frequencies ranging between 15.5% and 54.5% compared to 74.2% stimulation by the synthetic strigolactone (GR24) used a positive control; ii) Crotalaria blocked Striga entry at multiple levels and did not allow growth beyond the pericycle, effectively blocking vascular connection with the non-host. Hence, Crotalaria is suitable as a trap crop in integrated Striga management.
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Abstract
Ethylene is a gaseous phytohormone and the first of this hormone class to be discovered. It is the simplest olefin gas and is biosynthesized by plants to regulate plant development, growth, and stress responses via a well-studied signaling pathway. One of the earliest reported responses to ethylene is the triple response. This response is common in eudicot seedlings grown in the dark and is characterized by reduced growth of the root and hypocotyl, an exaggerated apical hook, and a thickening of the hypocotyl. This proved a useful assay for genetic screens and enabled the identification of many components of the ethylene-signaling pathway. These components include a family of ethylene receptors in the membrane of the endoplasmic reticulum (ER); a protein kinase, called constitutive triple response 1 (CTR1); an ER-localized transmembrane protein of unknown biochemical activity, called ethylene-insensitive 2 (EIN2); and transcription factors such as EIN3, EIN3-like (EIL), and ethylene response factors (ERFs). These studies led to a linear model, according to which in the absence of ethylene, its cognate receptors signal to CTR1, which inhibits EIN2 and prevents downstream signaling. Ethylene acts as an inverse agonist by inhibiting its receptors, resulting in lower CTR1 activity, which releases EIN2 inhibition. EIN2 alters transcription and translation, leading to most ethylene responses. Although this canonical pathway is the predominant signaling cascade, alternative pathways also affect ethylene responses. This review summarizes our current understanding of ethylene signaling, including these alternative pathways, and discusses how ethylene signaling has been manipulated for agricultural and horticultural applications.
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Affiliation(s)
- Brad M Binder
- Department of Biochemistry and Cellular & Molecular Biology, University of Tennessee, Knoxville, Tennessee, USA
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Miyakawa T, Xu Y, Tanokura M. Molecular basis of strigolactone perception in root-parasitic plants: aiming to control its germination with strigolactone agonists/antagonists. Cell Mol Life Sci 2020; 77:1103-1113. [PMID: 31587093 PMCID: PMC11104851 DOI: 10.1007/s00018-019-03318-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 08/27/2019] [Accepted: 09/23/2019] [Indexed: 10/25/2022]
Abstract
The genus Striga, also called "witchweed", is a member of the family Orobanchaceae, which is a major family of root-parasitic plants. Striga can lead to the formation of seed stocks in the soil and to explosive expansion with enormous seed production and stability once the crops they parasitize are cultivated. Understanding the molecular mechanism underlying the communication between Striga and their host plants through natural seed germination stimulants, "strigolactones (SLs)", is required to develop the technology for Striga control. This review outlines recent findings on the SL perception mechanism, which have been accumulated in Striga hermonthica by the similarity of the protein components that regulate SL signaling in nonparasitic model plants, including Arabidopsis and rice. HTL/KAI2 homologs were identified as SL receptors in the process of Striga seed germination. Recently, this molecular basis has further promoted the development of various types of SL agonists/antagonists as seed germination stimulants or inhibitors. Such chemical compounds are also useful to elucidate the dynamic behavior of SL receptors and the regulation of SL signaling.
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Affiliation(s)
- Takuya Miyakawa
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Yuqun Xu
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Masaru Tanokura
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan.
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Jamil M, Kountche BA, Wang JY, Haider I, Jia KP, Takahashi I, Ota T, Asami T, Al-Babili S. A New Series of Carlactonoic Acid Based Strigolactone Analogs for Fundamental and Applied Research. FRONTIERS IN PLANT SCIENCE 2020; 11:434. [PMID: 32373143 PMCID: PMC7179673 DOI: 10.3389/fpls.2020.00434] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 03/24/2020] [Indexed: 05/02/2023]
Abstract
Strigolactones (SLs) are a group of carotenoid derived plant hormones that play a key role in establishing plant architecture and adapting it to environmental changes, and are involved in plants response to biotic and abiotic stress. SLs are also released into the soil to serve as a chemical signal attracting beneficial mycorrhizal fungi. However, this signal also induces seed germination in root parasitic weeds that represent a major global threat for agriculture. This wide spectrum of biological functions has made SL research one of the most important current topics in fundamental and applied plant science. The availability of SLs is crucial for investigating SL biology as well as for agricultural application. However, natural SLs are produced in very low amounts, and their organic synthesis is quite difficult, which creates a need for efficient and easy-to-synthesize analogs and mimics. Recently, we have generated a set of SL analogs, Methyl Phenlactonoates (MPs), which resemble the non-canonical SL carlactonoic acid. In this paper, we describe the development and characterization of a new series of easy-to-synthesize MPs. The new analogs were assessed with respect to regulation of shoot branching, impact on leaf senescence, and induction of seed germination in different root parasitic plants species. Some of the new analogs showed higher efficiency in inhibiting shoot branching as well as in triggering parasitic seed germination, compared to the commonly used GR24. MP16 was the most outstanding analog showing high activity in different SL biological functions. In summary, our new analogs series contains very promising candidates for different applications, which include the usage in studies for understanding different aspects of SL biology as well as large scale field application for combating root parasitic weeds, such as Striga hermonthica that devastates cereal yields in sub-Saharan Africa.
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Affiliation(s)
- Muhammad Jamil
- The BioActives Lab, Center for Desert Agriculture, Biological and Environment Science and Engineering (BESE), King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Boubacar A. Kountche
- The BioActives Lab, Center for Desert Agriculture, Biological and Environment Science and Engineering (BESE), King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Jian You Wang
- The BioActives Lab, Center for Desert Agriculture, Biological and Environment Science and Engineering (BESE), King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Imran Haider
- The BioActives Lab, Center for Desert Agriculture, Biological and Environment Science and Engineering (BESE), King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Kun-Peng Jia
- The BioActives Lab, Center for Desert Agriculture, Biological and Environment Science and Engineering (BESE), King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Ikuo Takahashi
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Tsuyoshi Ota
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Tadao Asami
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Salim Al-Babili
- The BioActives Lab, Center for Desert Agriculture, Biological and Environment Science and Engineering (BESE), King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
- *Correspondence: Salim Al-Babili,
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Blanco‐Ania D, Mateman JJ, Hýlová A, Spíchal L, Debie LM, Zwanenburg B. Hybrid-type strigolactone analogues derived from auxins. PEST MANAGEMENT SCIENCE 2019; 75:3113-3121. [PMID: 31317630 PMCID: PMC6852101 DOI: 10.1002/ps.5553] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 06/19/2019] [Accepted: 06/28/2019] [Indexed: 05/27/2023]
Abstract
BACKGROUND Strigolactones (SLs) have a vast number of ecological implications because of the broad spectrum of their biological activities. Unfortunately, the limited availability of SLs restricts their applicability for the benefit of humanity and renders synthesis the only option for their production. However, the structural complexity of SLs impedes their economical synthesis, which is unfeasible on a large scale. Synthesis of SL analogues and mimics with a simpler structure, but with retention of bioactivity, is the solution to this problem. RESULTS Here, we present eight new hybrid-type SL analogues derived from auxin, synthesized via coupling of auxin ester [ethyl 2-(1H-indol-3-yl)acetate] and of ethyl 2-phenylacetate with four D-rings (mono-, two di- and trimethylated). The new hybrid-type SL analogues were bioassayed to assess the germination activity of seeds of the parasitic weeds Striga hermonthica, Orobanche minor and Phelipanche ramosa using the classical method of counting germinated seeds and a colorimetric method. The bioassays revealed that analogues with a natural monomethylated D-ring had appreciable to good activity towards the three species and were the most active derivatives. By contrast, derivatives with the trimethylated D-ring showed no activity. The dimethylated derivatives (2,4-dimethyl and 3,4-dimethyl) were slightly active, especially towards P. ramosa. CONCLUSIONS New hybrid-type analogues derived from auxins have been prepared. These analogues may be attractive as potential suicidal germination agents for parasitic weed control because of their ease of preparation and relevant bioactivity. © 2019 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Daniel Blanco‐Ania
- Institute for Molecules and Materials, Cluster of Organic ChemistryRadboud UniversityNijmegenthe Netherlands
| | - Jurgen J Mateman
- Institute for Molecules and Materials, Cluster of Organic ChemistryRadboud UniversityNijmegenthe Netherlands
| | - Adéla Hýlová
- Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Chemical Biology and GeneticsPalacký UniversityOlomoucCzech Republic
| | - Lukáš Spíchal
- Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Chemical Biology and GeneticsPalacký UniversityOlomoucCzech Republic
| | - Luc M Debie
- Institute for Molecules and Materials, Cluster of Organic ChemistryRadboud UniversityNijmegenthe Netherlands
| | - Binne Zwanenburg
- Institute for Molecules and Materials, Cluster of Organic ChemistryRadboud UniversityNijmegenthe Netherlands
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40
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Masteling R, Lombard L, de Boer W, Raaijmakers JM, Dini-Andreote F. Harnessing the microbiome to control plant parasitic weeds. Curr Opin Microbiol 2019; 49:26-33. [PMID: 31654911 PMCID: PMC6906922 DOI: 10.1016/j.mib.2019.09.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 09/04/2019] [Accepted: 09/09/2019] [Indexed: 12/11/2022]
Abstract
Plant microbiomes have an unexplored potential to control root parasitic weeds. Understanding the mechanisms by which microbes can control parasitic weeds is largely elusive. Members of the root microbiome can interfere with host-parasite chemical communication. Direct and indirect modes of action can work synergistically in microbe-mediated weed control.
Microbiomes can significantly expand the genomic potential of plants, contributing to nutrient acquisition, plant growth promotion and tolerance to (a)biotic stresses. Among biotic stressors, root parasitic weeds (RPWs), mainly of the genera Orobanche, Phelipanche and Striga, are major yield-limiting factors of a wide range of staple crops, particularly in developing countries. Here, we provide a conceptual synthesis of putative mechanisms by which soil and plant microbiomes could be harnessed to control RPWs. These mechanisms are partitioned in direct and indirect modes of action and discussed in the context of past and present studies on microbe-mediated suppression of RPWs. Specific emphasis is given to the large but yet unexplored potential of root-associated microorganisms to interfere with the chemical signalling cascade between the host plant and the RPWs. We further provide concepts and ideas for future research directions and prospective designs of novel control strategies.
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Affiliation(s)
- Raul Masteling
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands; Institute of Biology, Leiden University, Leiden, The Netherlands.
| | - Lorenzo Lombard
- Westerdijk Fungal Biodiversity Institute, Utrecht, The Netherlands
| | - Wietse de Boer
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands; Chair Group Soil Biology, Wageningen University and Research (WUR), Wageningen, The Netherlands
| | - Jos M Raaijmakers
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands; Institute of Biology, Leiden University, Leiden, The Netherlands.
| | - Francisco Dini-Andreote
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands; Department of Plant Science, The Pennsylvania State University, University Park, PA, USA; Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, USA
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Inuloxin E, a New Seco-Eudesmanolide Isolated from Dittrichia viscosa, Stimulating Orobanche cumana Seed Germination. Molecules 2019; 24:molecules24193479. [PMID: 31557920 PMCID: PMC6803869 DOI: 10.3390/molecules24193479] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 09/23/2019] [Accepted: 09/24/2019] [Indexed: 12/16/2022] Open
Abstract
A new sesquiterpenoid belonging to the subgroup seco-eudesmanolides and named inuloxin E was isolated from Dittrichia viscosa, together with the already known sesquiterpenoids inuloxins A–D and α-costic acid. Inuloxin E was characterized by spectroscopic data (essentially NMR and ESI MS) as 3-methylene-6-(1-methyl-4-oxo-pentyl)-3a,4,7,7a-tetrahydro-3H-benzofuran-2-one. Its relative configuration was determined by comparison with the closely related inuloxin D and chemical conversion of inuloxin E into inuloxin D and by the observed significant correlation in the NOESY spectrum. Both inuloxins D and E induced germination of the parasitic weed Orobanche cumana, but were inactive on the seeds of Orobanche minor and Phelipanche ramosa. The germination activity of some hemisynthetic esters of inuloxin D was also investigated.
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Macías FA, Mejías FJ, Molinillo JM. Recent advances in allelopathy for weed control: from knowledge to applications. PEST MANAGEMENT SCIENCE 2019; 75:2413-2436. [PMID: 30684299 DOI: 10.1002/ps.5355] [Citation(s) in RCA: 92] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 01/10/2019] [Accepted: 01/19/2019] [Indexed: 05/27/2023]
Abstract
Allelopathy is the biological phenomenon of chemical interactions between living organisms in the ecosystem, and must be taken into account in addressing pest and weed problems in future sustainable agriculture. Allelopathy is a multidisciplinary science, but in some cases, aspects of its chemistry are overlooked, despite the need for a deep knowledge of the chemical structural characteristics of allelochemicals to facilitate the design of new herbicides. This review is focused on the most important advances in allelopathy, paying particular attention to the design and development of phenolic compounds, terpenoids and alkaloids as herbicides. The isolation of allelochemicals is mainly addressed, but other aspects such as the analysis and activities of derivatives or analogs are also covered. Furthermore, the use of allelopathy in the fight against parasitic plants is included. The past 12 years have been a prolific period for publications on allelopathy. This critical review discusses future research areas in this field and the state of the art is analyzed from the chemist's perspective. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Francisco A Macías
- Allelopathy Group, Department of Organic Chemistry, School of Sciences, Institute of Biomolecules (INBIO), University of Cadiz, Cádiz, Spain
| | - Francisco Jr Mejías
- Allelopathy Group, Department of Organic Chemistry, School of Sciences, Institute of Biomolecules (INBIO), University of Cadiz, Cádiz, Spain
| | - José Mg Molinillo
- Allelopathy Group, Department of Organic Chemistry, School of Sciences, Institute of Biomolecules (INBIO), University of Cadiz, Cádiz, Spain
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Prandi C, Occhiato EG. From synthetic control to natural products: a focus on N-heterocycles. PEST MANAGEMENT SCIENCE 2019; 75:2385-2402. [PMID: 30624033 DOI: 10.1002/ps.5322] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 01/04/2019] [Accepted: 01/04/2019] [Indexed: 06/09/2023]
Abstract
Natural products containing a N-heterocycle motif are widespread in nature and medicinal plants, in particular, have proved to be a source of almost unlimited N-derived structures with high molecular diversity. Because of their intrinsic potential for use in both biomedical and agricultural applications, there is a general need for new compounds and for the synthesis of 'natural-inspired' analogues. Importantly, transition of a natural product from discovery to a 'market lead' is associated with an increasingly challenging demand for more of the compound, which cannot be met by isolation from natural plant sources, often due to low extraction yields and uneven availability of the plant source itself. Synthesis remains the most reliable approach to provide valuable products for the market. In this review, a comprehensive overview of our contribution to synthetic access to N-derived natural products is given. Major strengths of the proposed methodologies are discussed critically. © 2019 Society of Chemical Industry.
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Affiliation(s)
| | - Ernesto G Occhiato
- Department of Chemistry 'U. Schiff', Università degli Studi di Firenze, Sesto Fiorentino, Italy
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44
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Hýlová A, Pospíšil T, Spíchal L, Mateman JJ, Blanco-Ania D, Zwanenburg B. New hybrid type strigolactone mimics derived from plant growth regulator auxin. N Biotechnol 2019; 48:76-82. [PMID: 30077756 DOI: 10.1016/j.nbt.2018.08.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 07/30/2018] [Accepted: 08/01/2018] [Indexed: 11/26/2022]
Abstract
Strigolactones (SLs) constitute a new class of plant hormones of increasing importance in plant science. The structure of natural SLs is too complex for ready access by synthesis. Therefore, much attention is being given to design of SL analogues and mimics with a simpler structure but with retention of bioactivity. Here new hybrid type SL mimics have been designed derived from auxins, the common plant growth regulators. Auxins were simply coupled with the butenolide D-ring using bromo (or chloro) butenolide. D-rings having an extra methyl group at the vicinal C-3' carbon atom, or at the C-2' carbon atom, or at both have also been studied. The new hybrid type SL mimics were bioassayed for germination activity of seeds of the parasitic weeds S. hermonthica, O. minor and P. ramosa using the classical method of counting germinated seeds and a colorimetric method. For comparison SL mimics derived from phenyl acetic acid were also investigated. The bioassays revealed that mimics with a normal D-ring had appreciable to good activity, those with an extra methyl group at C-2' were also appreciably active, whereas those with a methyl group in the vicinal C-3' position were inactive (S. hermonthica) or only slightly active. The new hybrid type mimics may be attractive as potential suicidal germination agents in agronomic applications.
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Affiliation(s)
- Adéla Hýlová
- Palacký University, Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Chemical Biology and Genetics, Šlechtitelů 241/27, CZ-783 71 Olomouc, Czech Republic
| | - Tomáš Pospíšil
- Palacký University, Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Chemical Biology and Genetics, Šlechtitelů 241/27, CZ-783 71 Olomouc, Czech Republic.
| | - Lukáš Spíchal
- Palacký University, Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Chemical Biology and Genetics, Šlechtitelů 241/27, CZ-783 71 Olomouc, Czech Republic
| | - Jurgen J Mateman
- Radboud University, Institute for Molecules and Materials, Cluster of Organic Chemistry, Heyendaalsweg 135, 6525AJ Nijmegen, The Netherlands
| | - Daniel Blanco-Ania
- Radboud University, Institute for Molecules and Materials, Cluster of Organic Chemistry, Heyendaalsweg 135, 6525AJ Nijmegen, The Netherlands
| | - Binne Zwanenburg
- Palacký University, Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Chemical Biology and Genetics, Šlechtitelů 241/27, CZ-783 71 Olomouc, Czech Republic; Radboud University, Institute for Molecules and Materials, Cluster of Organic Chemistry, Heyendaalsweg 135, 6525AJ Nijmegen, The Netherlands
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Rial C, Varela RM, Molinillo JMG, López-Ráez JA, Macías FA. A new UHPLC-MS/MS method for the direct determination of strigolactones in root exudates and extracts. PHYTOCHEMICAL ANALYSIS : PCA 2019; 30:110-116. [PMID: 30280444 DOI: 10.1002/pca.2796] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 09/02/2018] [Accepted: 09/03/2018] [Indexed: 06/08/2023]
Abstract
INTRODUCTION Strigolactones (SLs) are the most representative germination stimulants for seeds of root parasitic plants, and they show activity even at concentrations below 10-10 M. The low amounts of stimulants produced by the host and their rapid degradability make it crucial to develop analytical methods with very low limits of quantification. OBJECTIVE To develop a sensitive and validated analytical method for the simultaneous quantification of seven SLs [7-oxoorobanchyl acetate (1), solanacol (2), orobanchol (4), strigol (5), fabacyl acetate (6), orobanchyl acetate (7), and 5-deoxystrigol (8)]. METHODS SLs were analysed using ultra-high performance liquid chromatography coupled to tandem mass spectrometry (UHPLC-MS/MS), with (±)-GR24 (3) employed as internal standard (IS). Validation was based on selectivity, linearity, precision of the peak areas (repeatability and intermediate precision), detection and quantification limits, and stability. RESULTS A simple, rapid and reliable UHPLC-MS/MS method has been validated for the routine analysis of seven SLs and has been successfully applied to quantify them in exudates and extracts from tomato roots (Solanum lycopersicum). The limits of quantifications range from 0.05 μg/L for 5-deoxystrigol to 0.96 μg/L for solanacol. CONCLUSION The method provides a useful tool for research in all the fields related to SLs, both for studies related to their function as hormones, and signalling molecules in the rhizosphere, without sample preparation required for extracts and root exudates in less than 11 minutes.
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Affiliation(s)
- Carlos Rial
- Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus de Excelencia Internacional (ceiA3), School of Science, University of Cadiz, Cadiz, Spain
| | - Rosa M Varela
- Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus de Excelencia Internacional (ceiA3), School of Science, University of Cadiz, Cadiz, Spain
| | - José M G Molinillo
- Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus de Excelencia Internacional (ceiA3), School of Science, University of Cadiz, Cadiz, Spain
| | - Juan A López-Ráez
- Soil Microbiology and Symbiotic Systems, Estación Experimental del Zaidín (CSIC), Granada, Spain
| | - Francisco A Macías
- Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus de Excelencia Internacional (ceiA3), School of Science, University of Cadiz, Cadiz, Spain
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Jamil M, Kountche B, Haider I, Wang J, Aldossary F, Zarban R, Jia KP, Yonli D, Shahul Hameed U, Takahashi I, Ota T, Arold S, Asami T, Al-Babili S. Methylation at the C-3' in D-Ring of Strigolactone Analogs Reduces Biological Activity in Root Parasitic Plants and Rice. FRONTIERS IN PLANT SCIENCE 2019; 10:353. [PMID: 31001294 PMCID: PMC6455008 DOI: 10.3389/fpls.2019.00353] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 03/07/2019] [Indexed: 05/04/2023]
Abstract
Strigolactones (SLs) regulate plant development and induce seed germination in obligate root parasitic weeds, e.g. Striga spp. Because organic synthesis of natural SLs is laborious, there is a large need for easy-to-synthesize and efficient analogs. Here, we investigated the effect of a structural modification of the D-ring, a conserved structural element in SLs. We synthesized and investigated the activity of two analogs, MP13 and MP26, which differ from previously published AR8 and AR36 only in the absence of methylation at C-3'. The de-methylated MP13 and MP26 were much more efficient in regulating plant development and inducing Striga seed germination, compared with AR8. Hydrolysis assays performed with purified Striga SL receptor and docking of AR8 and MP13 to the corresponding active site confirmed and explained the higher activity. Field trials performed in a naturally Striga-infested African farmer's field unraveled MP13 as a promising candidate for combating Striga by inducing germination in host's absence. Our findings demonstrate that methylation of the C-3' in D-ring in SL analogs has a negative impact on their activity and identify MP13 and, particularly, MP26 as potent SL analogs with simple structures, which can be employed to control Striga, a major threat to global food security.
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Affiliation(s)
- Muhammad Jamil
- The BioActives Lab, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Boubacar A. Kountche
- The BioActives Lab, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Imran Haider
- The BioActives Lab, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Jian You Wang
- The BioActives Lab, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Faisal Aldossary
- The BioActives Lab, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Randa A. Zarban
- The BioActives Lab, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Kun-Peng Jia
- The BioActives Lab, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Djibril Yonli
- Institute of Environment and Agricultural Research (INERA), Ouagadougou, Burkina Faso
| | - Umar F. Shahul Hameed
- Computational Bioscience Research Center, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Ikuo Takahashi
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Tsuyoshi Ota
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Stefan T. Arold
- Computational Bioscience Research Center, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Tadao Asami
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Salim Al-Babili
- The BioActives Lab, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
- *Correspondence: Salim Al-Babili,
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Dvorakova M, Hylova A, Soudek P, Retzer K, Spichal L, Vanek T. Resorcinol-Type Strigolactone Mimics as Potent Germinators of the Parasitic Plants Striga hermonthica and Phelipanche ramosa. JOURNAL OF NATURAL PRODUCTS 2018; 81:2321-2328. [PMID: 30362743 DOI: 10.1021/acs.jnatprod.8b00160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Strigolactones are a particular class of plant metabolites with diverse biological functions starting from the stimulation of parasitic seed germination to phytohormonal activity. The expansion of parasitic weeds in the fields of developing countries is threatening the food supply and calls for simple procedures to combat these weeds. Strigolactone analogues represent a promising approach for such control through suicidal germination, i.e., parasitic seed germination without the presence of the host causing parasite death. In the present work, the synthesis of resorcinol-type strigolactone mimics related to debranones is reported. These compounds were highly stable even at alkaline pH levels and able to induce seed germination of parasitic plants Striga hermonthica and Phelipanche ramosa at low concentrations, EC50 ≈ 2 × 10-7 M ( Striga) and EC50 ≈ 2 × 10-9 M ( Phelipanche). On the other hand, the mimics had no significant effect on root architecture of Arabidopsis plants, suggesting a selective activity for parasitic seed germination, making them a primary target as suicidal germinators.
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Affiliation(s)
- Marcela Dvorakova
- Institute of Experimental Botany, Czech Academy of Sciences , v.v.i., Rozvojova 263 , 16502 , Prague 6 , Czech Republic
| | - Adela Hylova
- Centre of the Region Hana for Biotechnological and Agricultural Research, Department of Chemical Biology and Genetics, Faculty of Science , Palacky University , Slechtitelu 241/27 , 783 71 , Olomouc , Czech Republic
| | - Petr Soudek
- Institute of Experimental Botany, Czech Academy of Sciences , v.v.i., Rozvojova 263 , 16502 , Prague 6 , Czech Republic
| | - Katarzyna Retzer
- Institute of Experimental Botany, Czech Academy of Sciences , v.v.i., Rozvojova 263 , 16502 , Prague 6 , Czech Republic
| | - Lukas Spichal
- Centre of the Region Hana for Biotechnological and Agricultural Research, Department of Chemical Biology and Genetics, Faculty of Science , Palacky University , Slechtitelu 241/27 , 783 71 , Olomouc , Czech Republic
| | - Tomas Vanek
- Institute of Experimental Botany, Czech Academy of Sciences , v.v.i., Rozvojova 263 , 16502 , Prague 6 , Czech Republic
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Kountche BA, Novero M, Jamil M, Asami T, Bonfante P, Al-Babili S. Effect of the strigolactone analogs methyl phenlactonoates on spore germination and root colonization of arbuscular mycorrhizal fungi. Heliyon 2018; 4:e00936. [PMID: 30519652 PMCID: PMC6260433 DOI: 10.1016/j.heliyon.2018.e00936] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Revised: 10/23/2018] [Accepted: 11/12/2018] [Indexed: 11/28/2022] Open
Abstract
Strigolactones (SLs), a novel class of plant hormones, are key regulator of plant architecture and mediator of biotic interactions in the rhizosphere. Root-released SLs initiate the establishment of arbuscular mycorrhizal (AM) symbiosis by inducing spore germination and hyphal branching in AM fungi (AMF). However, these compounds also trigger the germination of root parasitic weeds, paving the way for deleterious infestation. Availability of SLs is required for investigating of their functions and also for application in agriculture. However, natural SLs are difficult to synthesize due to their complex structure and cannot be isolated at large scale, as they are released at very low concentrations. Therefore, there is a need for synthetic SL analogs. Recently, we reported on the development of simple SL analogs, methyl phenlactonoates (MPs), which show high SL activity in plants. Here, we investigate the effect of MP1, MP3 and the widely used SL-analog GR24 on AMF spore germination and host root colonization. Our results show that MP1 and MP3 inhibit AMF spore germination, but promote the intra-radical root colonization, both more efficiently than GR24. These results indicate that field application of MP1 and MP3 does not have negative impact on mycorrhizal fungi. In conclusion, our data together with the previously reported simple synthesis, high activity in regulating plant architecture and inducing Striga seed germination, demonstrate the utility of MP1 and MP3 as for field application in combating root parasitic weeds by inducing germination in host's absence.
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Affiliation(s)
- Boubacar A Kountche
- King Abdullah University of Science and Technology (KAUST), BESE Division, The BioActives Lab, Thuwal, 23955-6900, Saudi Arabia
| | - Mara Novero
- University of Turin, Life Sciences and Systems Biology Department, Italy
| | - Muhammad Jamil
- King Abdullah University of Science and Technology (KAUST), BESE Division, The BioActives Lab, Thuwal, 23955-6900, Saudi Arabia
| | - Tadao Asami
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-8657, Japan
| | - Paola Bonfante
- University of Turin, Life Sciences and Systems Biology Department, Italy
| | - Salim Al-Babili
- King Abdullah University of Science and Technology (KAUST), BESE Division, The BioActives Lab, Thuwal, 23955-6900, Saudi Arabia
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Mostofa MG, Li W, Nguyen KH, Fujita M, Tran LSP. Strigolactones in plant adaptation to abiotic stresses: An emerging avenue of plant research. PLANT, CELL & ENVIRONMENT 2018; 41:2227-2243. [PMID: 29869792 DOI: 10.1111/pce.13364] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 05/11/2018] [Accepted: 05/30/2018] [Indexed: 05/19/2023]
Abstract
Phytohormones play central roles in boosting plant tolerance to environmental stresses, which negatively affect plant productivity and threaten future food security. Strigolactones (SLs), a class of carotenoid-derived phytohormones, were initially discovered as an "ecological signal" for parasitic seed germination and establishment of symbiotic relationship between plants and beneficial microbes. Subsequent characterizations have described their functional roles in various developmental processes, including root development, shoot branching, reproductive development, and leaf senescence. SLs have recently drawn much attention due to their essential roles in the regulation of various physiological and molecular processes during the adaptation of plants to abiotic stresses. Reports suggest that the production of SLs in plants is strictly regulated and dependent on the type of stresses that plants confront at various stages of development. Recently, evidence for crosstalk between SLs and other phytohormones, such as abscisic acid, in responses to abiotic stresses suggests that SLs actively participate within regulatory networks of plant stress adaptation that are governed by phytohormones. Moreover, the prospective roles of SLs in the management of plant growth and development under adverse environmental conditions have been suggested. In this review, we provide a comprehensive discussion pertaining to SL-mediated plant responses and adaptation to abiotic stresses.
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Affiliation(s)
- Mohammad Golam Mostofa
- Department of Biochemistry and Molecular Biology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
| | - Weiqiang Li
- Stress Adaptation Research Unit, RIKEN Center for Sustainable Resource Science, Yokohama, Japan
| | - Kien Huu Nguyen
- Stress Adaptation Research Unit, RIKEN Center for Sustainable Resource Science, Yokohama, Japan
| | - Masayuki Fujita
- Laboratory of Plant Stress Responses, Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki, Japan
| | - Lam-Son Phan Tran
- Plant Stress Research Group & Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam; Stress Adaptation Research Unit, RIKEN Center for Sustainable Resource Science, Yokohama, Japan
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50
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Shahul Hameed U, Haider I, Jamil M, Kountche BA, Guo X, Zarban RA, Kim D, Al-Babili S, Arold ST. Structural basis for specific inhibition of the highly sensitive ShHTL7 receptor. EMBO Rep 2018; 19:embr.201745619. [PMID: 30021834 PMCID: PMC6123649 DOI: 10.15252/embr.201745619] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 06/19/2018] [Accepted: 06/20/2018] [Indexed: 11/09/2022] Open
Abstract
Striga hermonthica is a root parasitic plant that infests cereals, decimating yields, particularly in sub‐Saharan Africa. For germination, Striga seeds require host‐released strigolactones that are perceived by the family of HYPOSENSITIVE to LIGHT (ShHTL) receptors. Inhibiting seed germination would thus be a promising approach for combating Striga. However, there are currently no strigolactone antagonists that specifically block ShHTLs and do not bind to DWARF14, the homologous strigolactone receptor of the host. Here, we show that the octyl phenol ethoxylate Triton X‐100 inhibits S. hermonthica seed germination without affecting host plants. High‐resolution X‐ray structures reveal that Triton X‐100 specifically plugs the catalytic pocket of ShHTL7. ShHTL7‐specific inhibition by Triton X‐100 demonstrates the dominant role of this particular ShHTL receptor for Striga germination. Our structural analysis provides a rationale for the broad specificity and high sensitivity of ShHTL7, and reveals that strigolactones trigger structural changes in ShHTL7 that are required for downstream signaling. Our findings identify Triton and the related 2‐[4‐(2,4,4‐trimethylpentan‐2‐yl)phenoxy]acetic acid as promising lead compounds for the rational design of efficient Striga‐specific herbicides.
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Affiliation(s)
- Umar Shahul Hameed
- Division of Biological and Environmental Sciences and Engineering, Computational Bioscience Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Imran Haider
- Division of Biological and Environmental Sciences and Engineering, The Bioactives Lab, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Muhammad Jamil
- Division of Biological and Environmental Sciences and Engineering, The Bioactives Lab, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Boubacar A Kountche
- Division of Biological and Environmental Sciences and Engineering, The Bioactives Lab, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Xianrong Guo
- Core Labs, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Randa A Zarban
- Division of Biological and Environmental Sciences and Engineering, The Bioactives Lab, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Dongjin Kim
- Division of Biological and Environmental Sciences and Engineering, The Bioactives Lab, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Salim Al-Babili
- Division of Biological and Environmental Sciences and Engineering, The Bioactives Lab, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Stefan T Arold
- Division of Biological and Environmental Sciences and Engineering, Computational Bioscience Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
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