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Terensan S, Fernando HNS, Silva JN, Perera SACN, Kottearachchi NS, Weerasena OVDSJ. Morphological and Molecular Analysis of Fungal Species Associated with Blast and Brown Spot Diseases of Oryza sativa. PLANT DISEASE 2022; 106:1617-1625. [PMID: 34931899 DOI: 10.1094/pdis-04-21-0864-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Fungal diseases blast and brown spot in rice cause severe yield losses worldwide. Blast is caused by Magnaporthe oryzae, and Bipolaris oryzae is reported as the main causal organism of brown spot. Both diseases cause leaf lesions that are difficult differentiate until the later stages. Early detection and differentiation of the lesions would help the adoption of disease management strategies specific to the pathogens and prevent reductions in the quality and quantity of rice yields. This study was conducted in the Northern Province of Sri Lanka over five consecutive rice cultivating seasons to characterize the causal fungi of rice blast and brown spot diseases by morphological and molecular means and to develop a visual guide to differentiate the two diseases. Disease incidence was recorded in 114 fields from 2017 to 2019, and fungal isolates associated with the lesions of both diseases were cultured and subjected to morphological and molecular characterization. Competitive growth interactions between M. oryzae and the more common individual fungal isolates of the brown spot lesions were evaluated. Fungal metagenomic analysis was conducted for the fungal species isolated from brown spot lesions. A suppression of blast accompanied by an increased incidence of brown spot disease was observed during the study period. M. oryzae was confirmed to be the causal organism of the blast, and >20 species of fungi were identified to be associated with brown spot lesions through morphological and molecular studies and metagenomic analyses. Fungal internal transcribed spacer region sequencing revealed genetic variation in the highly conserved region of DNA sequences of blast and brown spot fungal isolates. B. oryzae, Curvularia, and Microdochium species were commonly isolated from brown spot lesions. In vitro competitive growth interactions between the fungal isolates revealed growth suppression of M. oryzae by the fungal isolates associated with brown spot lesions. Similarly, it can be speculated that the abundance and severity of blast in the field may have an influence on brown spot-associated fungi. A simple visual guide was developed to differentiate blast and brown spot lesions. The findings would be highly useful in the timely management of these major fungal diseases affecting rice.
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Affiliation(s)
- Suvanthini Terensan
- Institute of Biochemistry Molecular Biology and Biotechnology, University of Colombo, Colombo 0070, Sri Lanka
| | | | - J Nilanthi Silva
- Regional Rice Research and Development Center, Bombuwala 12024, Sri Lanka
| | - S A Chandrika N Perera
- Department of Agricultural Biology, Faculty of Agriculture, University of Peradeniya, Peradeniya 20400, Sri Lanka
| | - Nisha S Kottearachchi
- Department of Biotechnology, Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, Gonawila 60170, Sri Lanka
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Zeb A, Liu W, Meng L, Lian J, Wang Q, Lian Y, Chen C, Wu J. Effects of polyester microfibers (PMFs) and cadmium on lettuce (Lactuca sativa) and the rhizospheric microbial communities: A study involving physio-biochemical properties and metabolomic profiles. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127405. [PMID: 34629197 DOI: 10.1016/j.jhazmat.2021.127405] [Citation(s) in RCA: 56] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/28/2021] [Accepted: 09/29/2021] [Indexed: 05/06/2023]
Abstract
Microfibers (MFs) and cadmium (Cd) are widely distributed in soil ecosystems, posing a potential threat to soil biota. To explore potential risks of single MFs and in combination with Cd (co-PMFs/Cd) to soil environment, we systematically investigated the effects of PMFs and co-PMFs/Cd treatments on physio-biochemical performance and metabolomic profile of lettuce (Lactuca sativa), as well as the rhizospheric bacterial communities. Our results showed that both PMFs and co-PMFs/Cd treatments adversely disturbed the plant shoot length, photosynthetic, and chlorophyll content. Co-PMFs/Cd specifically increased the activities of antioxidant enzymes. The metabolites in lettuce leaf were significantly altered by PMFs and co-PMFs/Cd treatments. A significant reduction in the relative abundance of amino acids sugar and sugar alcohols indicated the altered nitrogen and carbohydrates related metabolic pathways. Additionally, PMFs and co-PMFs/Cd treatments altered the structure of rhizospheric bacterial communities and caused significant changes in some key beneficial/functional bacteria involved in the C, and N cycles. The present study provides a novel insight into the potential effects of PMFs on plant and rhizosphere bacterial communities and highlights that PMFs can threaten the terrestrial ecosystem and should be further explored in future research.
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Affiliation(s)
- Aurang Zeb
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education (MOE)/Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Weitao Liu
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education (MOE)/Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
| | - Lingzuo Meng
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education (MOE)/Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; College of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China
| | - Jiapan Lian
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education (MOE)/Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Key Laboratory of Environmental Remediation and Ecosystem Health, Ministry of Education (MOE), College of Environmental and Resources Sciences, Zhejiang University, Hangzhou 310058, China
| | - Qi Wang
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education (MOE)/Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Yuhang Lian
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education (MOE)/Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Cuihong Chen
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education (MOE)/Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Jiani Wu
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education (MOE)/Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
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Benzoic Acid and Its Hydroxylated Derivatives Suppress Early Blight of Tomato ( Alternaria solani) via the Induction of Salicylic Acid Biosynthesis and Enzymatic and Nonenzymatic Antioxidant Defense Machinery. J Fungi (Basel) 2021; 7:jof7080663. [PMID: 34436201 PMCID: PMC8400885 DOI: 10.3390/jof7080663] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 07/30/2021] [Accepted: 08/14/2021] [Indexed: 01/24/2023] Open
Abstract
Tomato early blight, caused by Alternaria solani, is a destructive foliar fungal disease. Herein, the potential defensive roles of benzoic acid (BA) and two of its hydroxylated derivatives, ρ-hydroxybenzoic acid (HBA), and protocatechuic acid (PCA) against A. solani were investigated. All tested compounds showed strong dose-dependent fungistatic activity against A. solani and significantly reduced the disease development. Benzoic acid, and its hydroxylated derivatives, enhanced vegetative growth and yield traits. Moreover, BA and its derivatives induce the activation of enzymatic (POX, PPO, CAT, SlAPXs, and SlSODs) and non-enzymatic (phenolics, flavonoids, and carotenoids) antioxidant defense machinery to maintain reactive oxygen species (ROS) homeostasis within infected leaves. Additionally, BA and its hydroxylated derivatives induce the accumulation of salicylic acid (SA) and its biosynthetic genes including isochorismate synthase (SlICS), aldehyde oxidases (SlAO1 and SlAO2), and phenylalanine ammonia-lyases (SlPAL1, SlPAL2, SlPAL3, SlPAL5, and SlPAL6). Higher SA levels were associated with upregulation of pathogenesis-related proteins (SlPR-1, SlPR1a2, SlPRB1-2, SlPR4, SlPR5, SlPR6), nonexpressor of pathogenesis-related protein 1 (SlNPR1), and salicylic acid-binding protein (SlSABP2). These findings outline the potential application of BA and its hydroxylated derivatives as a sustainable alternative control strategy for early blight disease and also deciphering the physiological and biochemical mechanisms behind their protective role.
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Wang W, Yu Z, Meng J, Zhou P, Luo T, Zhang J, Wu J, Lou Y. Rice phenolamindes reduce the survival of female adults of the white-backed planthopper Sogatella furcifera. Sci Rep 2020; 10:5778. [PMID: 32238850 PMCID: PMC7113316 DOI: 10.1038/s41598-020-62752-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 03/19/2020] [Indexed: 11/10/2022] Open
Abstract
In response to infestation by herbivores, rice plants rapidly biosynthesize defense compounds by activating a series of defense-related pathways. However, which defensive compounds in rice are effective against herbivores remains largely unknown. We found that the infestation of white-backed planthopper (WBPH) Sogatella furcifera gravid females significantly increased levels of jasmonic acid (JA), jasmonoyl-isoleucine (JA-Ile) and H2O2, and reduced the level of ethylene in rice; levels of 11 of the tested 12 phenolamides (PAs) were subsequently enhanced. In contrast, WBPH nymph infestation had no effect on levels of JA, JA-Ile, ethylene and H2O2 in rice, and enhanced levels of only 2 of 12 PAs. Moreover, infestation by brown planthopper Nilaparvata lugens gravid females also affected the production of these PAs differently. Bioassays revealed that 4 PAs - N-feruloylputrescine, N-feruloyltyramine, feruloylagmatine and N1,N10-diferuloylspermidine - were toxic to newly emerged WBPH female adults. Our results suggest that WBPH- or BPH-induced biosynthesis of PAs in rice seems to be shaped primarily by the specific profile of defense-related signals elicited by the herbivore and that PAs play a role in conferring the resistance to WBPH on rice.
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Affiliation(s)
- Wanwan Wang
- Department of Chemistry, Zhejiang University, Hangzhou, 310058, China
- State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Zhuoxian Yu
- State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Jinpeng Meng
- Department of Chemistry, Zhejiang University, Hangzhou, 310058, China
| | - Pengyong Zhou
- State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Ting Luo
- State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Jin Zhang
- State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Jun Wu
- Department of Chemistry, Zhejiang University, Hangzhou, 310058, China.
| | - Yonggen Lou
- State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, 310058, China.
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Phytochemical Compounds of Branches from P. halepensis Oily Liquid Extract and S. terebinthifolius Essential Oil and Their Potential Antifungal Activity. Processes (Basel) 2020. [DOI: 10.3390/pr8030330] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
In the present study, the antifungal activity of wood treated with Pinus halepensis branch n-hexane oily liquid extract (OLE) and Schinus terebinthifolius branch essential oil (EO) was evaluated against the growth of four phytopathogenic fungi—Bipolaris oryzae, Fusarium oxysporum, Fusarium solani, and Rhizoctonia solani. Air-dried wood samples of Pinus roxburghii were autoclaved, and each wood received 100 µL of the concentrated oils from P. halepensis and S. terebinthifolius. The main compounds identified in S. terebinthifolius branch EO were terpinen-4-ol (18.25%), cis-β-terpineol (15.60%), γ-terpinene (12.46%), sabinene (9.83%), α-terpinene (8.56%), and 4-thujanol (6.71%), while the main compounds in P. halepensis branch HeO were 2-undecenal (22.25%), 4-hydroxy-10-methyl-3,4,7,8,9,10-hexahydro-2H-oxecin-2-one (8.43%), (Z)-2-decenal (6.88%), nonanal (5.85%), (2E)-2-decenal (4.65%), (E,E)-2,4-decadienal (4.41%), arachidonic acid methyl ester (4.36%), and 2-(7-heptadecynyloxy)tetrahydro-2H-pyran (4.22%). P. halepensis OLE at a concentration of 3% showed the highest inhibition percentage of fungal growth (IPFG) of B. oryzae, followed by S. terebinthifolius EO at 3% and 2%, with IPFG values of 80%, 74.44%, and 71.66%, respectively. At a concentration of 3%, branch oils from S. terebinthifolius and P. halepensis were found to have the highest IPFG values with 45.55% and 40.55%, respectively, against F. oxysporum growth. Moderate to weak activity was found against F. solani when S. terebinthifolius EO and P. halepensis OLE were applied to wood. EO and OLE-treated wood samples at 3% produced inhibitions of 54.44% and 41.11%, respectively, against R. solani.
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Sharma M, Chahal KK, Kaur R, Singh R, Kataria D. Antifungal potential and structure activity relationship of carrot seed constituents. J Food Biochem 2019; 43:e12971. [PMID: 31489671 DOI: 10.1111/jfbc.12971] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Revised: 05/24/2019] [Accepted: 06/10/2019] [Indexed: 11/29/2022]
Abstract
The aim of this study was to evaluate in vitro antifungal potential of carrot seed extracts, its essential oil, different fractions, isolated compounds, and their derivatives against three phytopathogenic rice fungi (Fusarium moniliforme, Bipolaris oryzae, and Rhizoctonia solani) using poisoned food technique. Carrot seed essential oil was extracted using hydrodistillation method and extracts were prepared using different solvents viz. dichloromethane, hexane, and methanol. The pure compounds daucene, carotol, and daucol were isolated using column chromatography and derivatized using different reagents. The study demonstrated that antifungal potential of all tested compounds varied in a dose dependent manner. Structure activity relationship of isolated and derivatized compounds showed that polar moieties possessed more antifungal potential as compared to non-polar moieties. The results suggested that carrot seed methanol extract and carotol possessed strong antifungal potential as compared to other components tested. PRACTICAL APPLICATIONS: Phytopathogenic fungi are the major problems causing harmful damage to the rice crop. Only available control of these diseases is synthetic fungicides but their repeated use led to serious environmental issues, residual toxicity, and development of resistance. Therefore, it's better to find some natural alternatives. The current study was conducted to evaluate in vitro antifungal potential of carrot seed essential oil, its constituents and extracts against phytopathogenic fungi of rice. The methanol extract and carotol possessed highest antifungal potential which might be due to their polar nature. This information may add a new dimensions to biological activity of these natural molecules mainly in the field of agriculture as fungal diseases are found to be associated with major losses in agriculture. Hence these compounds can act as natural antifungal agents against rice fungi.
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Affiliation(s)
- Mukta Sharma
- Department of Chemistry, Punjab Agricultural University, Ludhiana, India
| | | | - Ramandeep Kaur
- Department of Chemistry, Punjab Agricultural University, Ludhiana, India
| | - Ravinder Singh
- Department of Chemistry, Punjab Agricultural University, Ludhiana, India
| | - Dalvir Kataria
- Department of Chemistry, Punjab Agricultural University, Ludhiana, India
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Boonpa K, Tantong S, Weerawanich K, Panpetch P, Pringsulaka O, Roytrakul S, Sirikantaramas S. In Silico Analyses of Rice Thionin Genes and the Antimicrobial Activity of OsTHION15 Against Phytopathogens. PHYTOPATHOLOGY 2019; 109:27-35. [PMID: 30028233 DOI: 10.1094/phyto-06-17-0217-r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Thionins are a family of antimicrobial peptides. We performed in silico expression analyses of the 44 rice (Oryza sativa) thionins (OsTHIONs). Modulated expression levels of OsTHIONs under different treatments suggest their involvement in many processes, including biotic, abiotic, and nutritional stress responses, and in hormone signaling. OsTHION15 (LOC_Os06g32600) was selected for further characterization based on several in silico analyses. OsTHION15 in O. sativa subsp. indica 'KDML 105' was expressed in all of the tissues and organs examined, including germinating seed, leaves, and roots of seedlings and mature plants, and inflorescences. To investigate the antimicrobial activity of OsTHION15, we produced a recombinant peptide in Escherichia coli Rosetta-gami (DE3). The recombinant OsTHION15 exhibited inhibitory activities toward rice-pathogenic bacteria such as Xanthomonas oryzae pv. oryzae and Pectobacterium carotovorum pv. atroseptica, with minimum inhibitory concentrations of 112.6 and 14.1 µg ml-1, respectively. A significant hyphal growth inhibition was also observed toward Fusarium oxysporum f. sp. cubense and Helminthosporium oryzae. In addition, we demonstrated the in planta antibacterial activity of this peptide in Nicotiana benthamiana against X. campestris pv. glycines. These activities suggest the possible application of OsTHION15 in plant disease control.
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Affiliation(s)
- Krissana Boonpa
- First author: Biotechnology Program, and second, third, fourth, and seventh authors: Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; fifth author: Department of Microbiology, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand; sixth author: Genome Technology Research Unit, National Center for Genetic Engineering and Biotechnology, Klong Luang, Pathumthani, 12120, Thailand; and seventh author: Natural Product Biotechnology Research Unit, Chulalongkorn University
| | - Suparuk Tantong
- First author: Biotechnology Program, and second, third, fourth, and seventh authors: Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; fifth author: Department of Microbiology, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand; sixth author: Genome Technology Research Unit, National Center for Genetic Engineering and Biotechnology, Klong Luang, Pathumthani, 12120, Thailand; and seventh author: Natural Product Biotechnology Research Unit, Chulalongkorn University
| | - Kamonwan Weerawanich
- First author: Biotechnology Program, and second, third, fourth, and seventh authors: Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; fifth author: Department of Microbiology, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand; sixth author: Genome Technology Research Unit, National Center for Genetic Engineering and Biotechnology, Klong Luang, Pathumthani, 12120, Thailand; and seventh author: Natural Product Biotechnology Research Unit, Chulalongkorn University
| | - Pawinee Panpetch
- First author: Biotechnology Program, and second, third, fourth, and seventh authors: Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; fifth author: Department of Microbiology, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand; sixth author: Genome Technology Research Unit, National Center for Genetic Engineering and Biotechnology, Klong Luang, Pathumthani, 12120, Thailand; and seventh author: Natural Product Biotechnology Research Unit, Chulalongkorn University
| | - Onanong Pringsulaka
- First author: Biotechnology Program, and second, third, fourth, and seventh authors: Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; fifth author: Department of Microbiology, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand; sixth author: Genome Technology Research Unit, National Center for Genetic Engineering and Biotechnology, Klong Luang, Pathumthani, 12120, Thailand; and seventh author: Natural Product Biotechnology Research Unit, Chulalongkorn University
| | - Sittiruk Roytrakul
- First author: Biotechnology Program, and second, third, fourth, and seventh authors: Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; fifth author: Department of Microbiology, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand; sixth author: Genome Technology Research Unit, National Center for Genetic Engineering and Biotechnology, Klong Luang, Pathumthani, 12120, Thailand; and seventh author: Natural Product Biotechnology Research Unit, Chulalongkorn University
| | - Supaart Sirikantaramas
- First author: Biotechnology Program, and second, third, fourth, and seventh authors: Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; fifth author: Department of Microbiology, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand; sixth author: Genome Technology Research Unit, National Center for Genetic Engineering and Biotechnology, Klong Luang, Pathumthani, 12120, Thailand; and seventh author: Natural Product Biotechnology Research Unit, Chulalongkorn University
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Surendran A, Siddiqui Y, Saud H, Ali N, Manickam S. Inhibition and kinetic studies of lignin degrading enzymes ofGanoderma boninenseby naturally occurring phenolic compounds. J Appl Microbiol 2018; 125:876-887. [DOI: 10.1111/jam.13922] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 04/29/2018] [Accepted: 05/15/2018] [Indexed: 11/30/2022]
Affiliation(s)
- A. Surendran
- The Laboratory of Climate-Smart Food Crop Production; Institute of Tropical Agriculture and Food Security; University of Putra Malaysia; Serdang Malaysia
| | - Y. Siddiqui
- The Laboratory of Plant Science and Technology; Institute of Plantation Studies; University of Putra Malaysia; Serdang Malaysia
| | - H.M. Saud
- Department of Agriculture Technology; Faculty of Agriculture; University of Putra Malaysia; Serdang Selangor Malaysia
| | - N.S. Ali
- Department of Plant Protection; Faculty of Agriculture; University of Putra Malaysia; Serdang Selangor Malaysia
| | - S. Manickam
- Department of Chemical and Environmental Engineering; University of Nottingham Malaysia Campus; Semenyih Selangor Malaysia
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Chen J, Li K, Le XC, Zhu L. Metabolomic analysis of two rice (Oryza sativa) varieties exposed to 2, 2', 4, 4'-tetrabromodiphenyl ether. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 237:308-317. [PMID: 29499574 DOI: 10.1016/j.envpol.2018.02.027] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 02/07/2018] [Accepted: 02/08/2018] [Indexed: 06/08/2023]
Abstract
Polybrominated diphenyl ethers (PBDEs) are toxic chemicals widely distributed in the environment, but few studies are available on their potential toxicity to rice at metabolic level. Therefore we exposed ten rice (Oryza sativa) varieties to 2,2',4,4'-tetrabromodiphenyl ether (BDE-47), a predominant congener of PBDEs, in hydroponic solutions with different concentrations. Two varieties that showed different biological effects to BDE-47, YY-9 and LJ-7, were screened as sensitive and tolerant varieties according to changes of morphological and physiological indicators. Metabolic research was then conducted using gas chromatography-mass spectrometry combined with diverse analyses. Results showed that LJ-7 was more active in metabolite profiles and adopted more effective antioxidant defense machinery to protect itself against oxidative damages induced by BDE-47 than YY-9. For LJ-7, the contents of 13 amino acids and 24 organic acids, especially l-glutamic acid, beta-alanine, glycolic acid and glyceric acid were up-regulated significantly which contributed to scavenging reactive oxygen species. In the treatment of 500 μg/L BDE-47, the contents of these four metabolites increased by 33.6-, 19.3-, 10.6- and 10.2-fold, respectively. The levels of most saccharides (such as d-glucose, lactulose, maltose, sucrose and d-cellobiose) also increased by 1.7-12.4 fold which promoted saccharide-related biosynthesis metabolism. Elevation of tricarboxylic acid cycle and glyoxylate and dicarboxylate metabolism enhanced energy-producing processes. Besides, the contents of secondary metabolites, chiefly polyols and glycosides increased significantly to act on defending oxidative stress induced by BDE-47. In contrast, the levels of most metabolites decreased significantly for YY-9, especially those of 13 amino acids (by 0.9%-67.1%) and 19 organic acids (by 7.8%-70.0%). The positive metabolic responses implied LJ-7 was tolerant to BDE-47, while the down-regulation of most metabolites indicated the susceptible nature of YY-9. Since metabolic change might affect the yield and quality of rice, this study can provide useful reference for rice cultivation in PBDEs-polluted areas.
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Affiliation(s)
- Jie Chen
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang, 310058, China
| | - Kelun Li
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang, 310058, China
| | - X Chris Le
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, T6G 2G3, Canada
| | - Lizhong Zhu
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang, 310058, China.
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Surendran A, Siddiqui Y, Ali NS, Manickam S. Inhibition and kinetic studies of cellulose- and hemicellulose-degrading enzymes of Ganoderma boninense by naturally occurring phenolic compounds. J Appl Microbiol 2018; 124:1544-1555. [PMID: 29405525 DOI: 10.1111/jam.13717] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 01/01/2018] [Accepted: 01/25/2018] [Indexed: 11/28/2022]
Abstract
AIM Ganoderma sp, the causal pathogen of the basal stem rot (BSR) disease of oil palm, secretes extracellular hydrolytic enzymes. These play an important role in the pathogenesis of BSR by nourishing the pathogen through the digestion of cellulose and hemicellulose of the host tissue. Active suppression of hydrolytic enzymes secreted by Ganoderma boninense by various naturally occurring phenolic compounds and estimation of their efficacy on pathogen suppression is focused in this study. METHODS AND RESULTS Ten naturally occurring phenolic compounds were assessed for their inhibitory effect on the hydrolytic enzymes of G. boninense. The enzyme kinetics (Vmax and Km ) and the stability of the hydrolytic enzymes were also characterized. The selected compounds had shown inhibitory effect at various concentrations. Two types of inhibitions namely uncompetitive and noncompetitive were observed in the presence of phenolic compounds. Among all the phenolic compounds tested, benzoic acid was the most effective compound suppressive to the growth and production of hydrolytic enzymes secreted by G. boninense. The phenolic compounds as inhibitory agents can be a better replacement for the metal ions which are known as conventional inhibitors till date. The three hydrolytic enzymes were stable in a wide range of pH and temperature. CONCLUSION These findings highlight the efficacy of the applications of phenolic compounds to control Ganoderma. SIGNIFICANCE AND IMPACT OF THE STUDY The study has proved a replacement for chemical controls of G. boninense with naturally occurring phenolic compounds.
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Affiliation(s)
- A Surendran
- Institute of Tropical Agriculture and food Security, The Laboratory of Climate-Smart Food Crop Production, University Putra Malaysia, Serdang, Malaysia
| | - Y Siddiqui
- Institute of Tropical Agriculture and food Security, The Laboratory of Climate-Smart Food Crop Production, University Putra Malaysia, Serdang, Malaysia
| | - N S Ali
- Department of Plant Protection, Faculty of Agriculture, University Putra Malaysia, Serdang, Selangor, Malaysia
| | - S Manickam
- Department of Chemical and Environmental Engineering, University of Nottingham Malaysia Campus, Semenyih, Selangor, Malaysia
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Alves GH, Paraginski RT, Lamas NDS, Hoffmann JF, Vanier NL, de Oliveira M. Effects of Organic and Conventional Cropping Systems on Technological Properties and Phenolic Compounds of Freshly Harvested and Stored Rice. J Food Sci 2017; 82:2276-2285. [PMID: 28876469 DOI: 10.1111/1750-3841.13802] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 05/28/2017] [Accepted: 06/09/2017] [Indexed: 11/29/2022]
Abstract
This study compared the physicochemical and technological properties of the IRGA 410 rice cultivar, obtained from organic and conventional cropping systems, and showed its susceptibility to changes during storage at 0, 6, and 12 mo. The rice conventional cropping system exhibited greater protein, lipids, and ash levels, and a head rice yield. However, organic rice presented greater total carbohydrates, soluble protein, amylose content, 33% greater free phenolics, and phenolic acids, but exhibited a greater percentage of stained grains during the storage period. The free phenolic content of cooked rice was lower than the free phenolic content of the raw rice. By Liquid chromatography with mass spectrometer (LC-MS) were identified p-coumaric and ferulic acids in both fractions (free and bound). The content of p-coumaric acid and ferulic acid in bound fraction was higher in organic brown rice than in conventional brown rice. At 6 and 12 mo of storage, the main fungi found were Aspergillus sp. and Penicillium sp. Prior to storage, the Bipolaris sp. fungi was identified only in organic rice. For conventional rice, the infestation level by Aspergillus sp. increased from 3% to 70% at the 6th mo of storage. In addition to the advantage of organic rice being free of agrochemicals, this study revealed that natural plant defense compounds could be produced when the rice was subjected to more biotic and abiotic stresses. However, some disadvantages were observed, such as lower protein content and a greater percentage of soluble protein, which favored the breaking of rice in processing, and a greater percentage of grain stained before and during storage. PRACTICAL APPLICATION The organic and conventional cropping systems affect the physicochemical and technological properties of rice grains, which is one of the main cereals grown and consumed in the world. This study shows the advantages and disadvantages of the cropping system in grain properties that are in the interest of both consumers and processing industries.
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Affiliation(s)
- Gabriela Hörnke Alves
- Dept. of Agroindustrial Science and Technology, Federal Univ. of Pelotas, 96010-900, Pelotas, RS, Brazil
| | - Ricardo Tadeu Paraginski
- Dept. of Agroindustrial Science and Technology, Federal Univ. of Pelotas, 96010-900, Pelotas, RS, Brazil
| | - Nelisa de Souza Lamas
- Dept. of Agroindustrial Science and Technology, Federal Univ. of Pelotas, 96010-900, Pelotas, RS, Brazil
| | - Jessica Fernanda Hoffmann
- Dept. of Agroindustrial Science and Technology, Federal Univ. of Pelotas, 96010-900, Pelotas, RS, Brazil
| | - Nathan Levien Vanier
- Dept. of Agroindustrial Science and Technology, Federal Univ. of Pelotas, 96010-900, Pelotas, RS, Brazil
| | - Maurício de Oliveira
- Dept. of Agroindustrial Science and Technology, Federal Univ. of Pelotas, 96010-900, Pelotas, RS, Brazil
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Tantong S, Pringsulaka O, Weerawanich K, Meeprasert A, Rungrotmongkol T, Sarnthima R, Roytrakul S, Sirikantaramas S. Two novel antimicrobial defensins from rice identified by gene coexpression network analyses. Peptides 2016; 84:7-16. [PMID: 27527801 DOI: 10.1016/j.peptides.2016.07.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Revised: 07/22/2016] [Accepted: 07/23/2016] [Indexed: 11/26/2022]
Abstract
Defensins form an antimicrobial peptides (AMP) family, and have been widely studied in various plants because of their considerable inhibitory functions. However, their roles in rice (Oryza sativa L.) have not been characterized, even though rice is one of the most important staple crops that is susceptible to damaging infections. Additionally, a previous study identified 598 rice genes encoding cysteine-rich peptides, suggesting there are several uncharacterized AMPs in rice. We performed in silico gene expression and coexpression network analyses of all genes encoding defensin and defensin-like peptides, and determined that OsDEF7 and OsDEF8 are coexpressed with pathogen-responsive genes. Recombinant OsDEF7 and OsDEF8 could form homodimers. They inhibited the growth of the bacteria Xanthomonas oryzae pv. oryzae, X. oryzae pv. oryzicola, and Erwinia carotovora subsp. atroseptica with minimum inhibitory concentration (MIC) ranging from 0.6 to 63μg/mL. However, these OsDEFs are weakly active against the phytopathogenic fungi Helminthosporium oryzae and Fusarium oxysporum f.sp. cubense. This study describes a useful method for identifying potential plant AMPs with biological activities.
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Affiliation(s)
- Supaluk Tantong
- Biotechnology Program, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Onanong Pringsulaka
- Department of Biology, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand.
| | - Kamonwan Weerawanich
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Arthitaya Meeprasert
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Thanyada Rungrotmongkol
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Rakrudee Sarnthima
- Department of Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham 44150, Thailand.
| | - Sittiruk Roytrakul
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, 12120, Thailand.
| | - Supaart Sirikantaramas
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; Omics Sciences and Bioinformatics Center, Chulalongkorn University, Bangkok 10330, Thailand.
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14
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Zhao L, Huang Y, Hu J, Zhou H, Adeleye AS, Keller AA. (1)H NMR and GC-MS Based Metabolomics Reveal Defense and Detoxification Mechanism of Cucumber Plant under Nano-Cu Stress. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:2000-10. [PMID: 26751164 DOI: 10.1021/acs.est.5b05011] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Because copper nanoparticles are being increasingly used in agriculture as pesticides, it is important to assess their potential implications for agriculture. Concerns have been raised about the bioaccumulation of nano-Cu and their toxicity to crop plants. Here, the response of cucumber plants in hydroponic culture at early development stages to two concentrations of nano-Cu (10 and 20 mg/L) was evaluated by proton nuclear magnetic resonance spectroscopy ((1)H NMR) and gas chromatography-mass spectrometry (GC-MS) based metabolomics. Changes in mineral nutrient metabolism induced by nano-Cu were determined by inductively coupled plasma-mass spectrometry (ICP-MS). Results showed that nano-Cu at both concentrations interferes with the uptake of a number of micro- and macro-nutrients, such as Na, P, S, Mo, Zn, and Fe. Metabolomics data revealed that nano-Cu at both levels triggered significant metabolic changes in cucumber leaves and root exudates. The root exudate metabolic changes revealed an active defense mechanism against nano-Cu stress: up-regulation of amino acids to sequester/exclude Cu/nano-Cu; down-regulation of citric acid to reduce the mobilization of Cu ions; ascorbic acid up-regulation to combat reactive oxygen species; and up-regulation of phenolic compounds to improve antioxidant system. Thus, we demonstrate that nontargeted (1)H NMR and GC-MS based metabolomics can successfully identify physiological responses induced by nanoparticles. Root exudates metabolomics revealed important detoxification mechanisms.
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Affiliation(s)
- Lijuan Zhao
- Bren School of Environmental Science and Management, University of California , Santa Barbara, California 93106-5131, United States
- University of California , Center for Environmental Implications of Nanotechnology, Santa Barbara, California 93106, United States
| | - Yuxiong Huang
- Bren School of Environmental Science and Management, University of California , Santa Barbara, California 93106-5131, United States
- University of California , Center for Environmental Implications of Nanotechnology, Santa Barbara, California 93106, United States
| | - Jerry Hu
- Materials Research Laboratory, University of California , Santa Barbara, California 93106-5050, United States
| | - Hongjun Zhou
- Neuroscience Research Institute and Molecular, Cellular and Developmental Biology, University of California Santa Barbara , Santa Barbara, California 93106, United States
| | - Adeyemi S Adeleye
- Bren School of Environmental Science and Management, University of California , Santa Barbara, California 93106-5131, United States
- University of California , Center for Environmental Implications of Nanotechnology, Santa Barbara, California 93106, United States
| | - Arturo A Keller
- Bren School of Environmental Science and Management, University of California , Santa Barbara, California 93106-5131, United States
- University of California , Center for Environmental Implications of Nanotechnology, Santa Barbara, California 93106, United States
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15
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Tadych M, Vorsa N, Wang Y, Bergen MS, Johnson-Cicalese J, Polashock JJ, White JF. Interactions between cranberries and fungi: the proposed function of organic acids in virulence suppression of fruit rot fungi. Front Microbiol 2015; 6:835. [PMID: 26322038 PMCID: PMC4536381 DOI: 10.3389/fmicb.2015.00835] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 07/29/2015] [Indexed: 11/13/2022] Open
Abstract
Cranberry fruit are a rich source of bioactive compounds that may function as constitutive or inducible barriers against rot-inducing fungi. The content and composition of these compounds change as the season progresses. Several necrotrophic fungi cause cranberry fruit rot disease complex. These fungi remain mostly asymptomatic until the fruit begins to mature in late August. Temporal fluctuations and quantitative differences in selected organic acid profiles between fruit of six cranberry genotypes during the growing season were observed. The concentration of benzoic acid in fruit increased while quinic acid decreased throughout fruit development. In general, more rot-resistant genotypes (RR) showed higher levels of benzoic acid early in fruit development and more gradual decline in quinic acid levels than that observed in the more rot-susceptible genotypes. We evaluated antifungal activities of selected cranberry constituents and found that most bioactive compounds either had no effects or stimulated growth or reactive oxygen species (ROS) secretion of four tested cranberry fruit rot fungi, while benzoic acid and quinic acid reduced growth and suppressed secretion of ROS by these fungi. We propose that variation in the levels of ROS suppressive compounds, such as benzoic and quinic acids, may influence virulence by the fruit rot fungi. Selection for crops that maintain high levels of virulence suppressive compounds could yield new disease resistant varieties. This could represent a new strategy for control of disease caused by necrotrophic pathogens that exhibit a latent or endophytic phase.
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Affiliation(s)
- Mariusz Tadych
- Department of Plant Biology and Pathology, Rutgers UniversityNew Brunswick, NJ, USA
| | - Nicholi Vorsa
- Philip E. Marucci Center for Blueberry and Cranberry Research and Extension, Rutgers UniversityChatsworth, NJ, USA
| | - Yifei Wang
- Department of Plant Biology and Pathology, Rutgers UniversityNew Brunswick, NJ, USA
| | - Marshall S. Bergen
- Department of Plant Biology and Pathology, Rutgers UniversityNew Brunswick, NJ, USA
| | - Jennifer Johnson-Cicalese
- Philip E. Marucci Center for Blueberry and Cranberry Research and Extension, Rutgers UniversityChatsworth, NJ, USA
| | - James J. Polashock
- Genetic Improvement of Fruits and Vegetables Laboratory, United States Department of Agriculture-Agriculture Research Service, Philip E. Marucci Center for Blueberry and Cranberry Research and ExtensionChatsworth, NJ, USA
| | - James F. White
- Department of Plant Biology and Pathology, Rutgers UniversityNew Brunswick, NJ, USA
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Cetin D, Hacımuftuoglu A, Tatar A, Turkez H, Togar B. The in vitro protective effect of salicylic acid against paclitaxel and cisplatin-induced neurotoxicity. Cytotechnology 2015. [PMID: 26199062 DOI: 10.1007/s10616-015-9896-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Paclitaxel (PAC) and cisplatin (CIS) are two established chemotherapeutic drugs used in combination for the treatment of various solid tumors. However, the usage of PAC and CIS are limited because of the incidence of their moderate or severe neurotoxic side effects. In this study, we aimed to assess the protective role of salicylic acid (SA) against neurotoxicity caused by PAC and CIS. For this purpose, newborn Sprague Dawley rats were decapitated in sterile atmosphere and primary cortex neuron cultures were established. On the 10th day SA was added into culture plates. PAC and CIS were added on the 12th day. The cytotoxicity was determined by using the MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay. Oxidative alterations were assessed using total antioxidant capacity and total oxidative stress assays in rat primary neuron cell cultures. It was shown that both concentrations of PAC and CIS treatments caused neurotoxicity. Although SA decreased the neurotoxicity by CIS and PAC, it was more effective against the toxicity caused by CIS rather than the toxicity caused by PAC. In conclusion it was clearly revealed that SA decreased the neurotoxic effect of CIS and PAC in vitro.
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Affiliation(s)
- Damla Cetin
- Department of Medical Pharmacology, Faculty of Medicine, Kafkas University, Kars, Turkey
| | - Ahmet Hacımuftuoglu
- Department of Medical Pharmacology, Faculty of Medicine, Atatürk University, Erzurum, Turkey.
| | - Abdulgani Tatar
- Department of Medical Genetics, Faculty of Medicine, Atatürk University, Erzurum, Turkey
| | - Hasan Turkez
- Department of Molecular Biology and Genetics, Faculty of Sciences, Erzurum Technical University, Erzurum, Turkey.,Department of Pharmacy, University "G. d'Annunzio" Chieti-Pescara, Chieti, Italy
| | - Basak Togar
- Department of Biology, Faculty of Science, Atatürk University, Erzurum, Turkey
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17
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Van Bockhaven J, Spíchal L, Novák O, Strnad M, Asano T, Kikuchi S, Höfte M, De Vleesschauwer D. Silicon induces resistance to the brown spot fungus Cochliobolus miyabeanus by preventing the pathogen from hijacking the rice ethylene pathway. THE NEW PHYTOLOGIST 2015; 206:761-73. [PMID: 25625327 DOI: 10.1111/nph.13270] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Accepted: 12/04/2014] [Indexed: 05/04/2023]
Abstract
Although numerous studies have shown the ability of silicon (Si) to mitigate a wide variety of abiotic and biotic stresses, relatively little is known about the underlying mechanism(s). Here, we have investigated the role of hormone defense pathways in Si-induced resistance to the rice brown spot fungus Cochliobolus miyabeanus. To delineate the involvement of multiple hormone pathways, a multidisciplinary approach was pursued, combining exogenous hormone applications, pharmacological inhibitor experiments, time-resolved hormone measurements, and bioassays with hormone-deficient and/or -insensitive mutant lines. Contrary to other types of induced resistance, we found Si-induced brown spot resistance to function independently of the classic immune hormones salicylic acid and jasmonic acid. Our data also rule out a major role of the abscisic acid (ABA) and cytokinin pathways, but suggest that Si mounts resistance to C. miyabeanus by preventing the fungus from hijacking the rice ethylene (ET) machinery. Interestingly, rather than suppressing rice ET signaling per se, Si probably interferes with the production and/or action of fungal ET. Together our findings favor a scenario whereby Si induces brown spot resistance by disarming fungal ET and argue that impairment of pathogen virulence factors is a core resistance mechanism underpinning Si-induced plant immunity.
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Affiliation(s)
- Jonas Van Bockhaven
- Laboratory of Phytopathology, Faculty of Bioscience Engineering, Ghent University, B-9000, Ghent, Belgium
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18
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Boiko I, Kobyletska М, Terek О. The role of sugars in salicylate-induced adaptation of plants to cadmium ions. UKRAINIAN BOTANICAL JOURNAL 2013. [DOI: 10.15407/ukrbotj70.01.103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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19
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Brechenmacher L, Lei Z, Libault M, Findley S, Sugawara M, Sadowsky MJ, Sumner LW, Stacey G. Soybean metabolites regulated in root hairs in response to the symbiotic bacterium Bradyrhizobium japonicum. PLANT PHYSIOLOGY 2010; 153:1808-22. [PMID: 20534735 PMCID: PMC2923908 DOI: 10.1104/pp.110.157800] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2010] [Accepted: 06/08/2010] [Indexed: 05/18/2023]
Abstract
Nodulation of soybean (Glycine max) root hairs by the nitrogen-fixing symbiotic bacterium Bradyrhizobium japonicum is a complex process coordinated by the mutual exchange of diffusible signal molecules. A metabolomic study was performed to identify small molecules produced in roots and root hairs during the rhizobial infection process. Metabolites extracted from roots and root hairs mock inoculated or inoculated with B. japonicum were analyzed by gas chromatography-mass spectrometry and ultraperformance liquid chromatography-quadrupole time of flight-mass spectrometry. These combined approaches identified 2,610 metabolites in root hairs. Of these, 166 were significantly regulated in response to B. japonicum inoculation, including various (iso)flavonoids, amino acids, fatty acids, carboxylic acids, and various carbohydrates. Trehalose was among the most strongly induced metabolites produced following inoculation. Subsequent metabolomic analyses of root hairs inoculated with a B. japonicum mutant defective in the trehalose synthase, trehalose 6-phosphate synthase, and maltooligosyltrehalose synthase genes showed that the trehalose detected in the inoculated root hairs was primarily of bacterial origin. Since trehalose is generally considered an osmoprotectant, these data suggest that B. japonicum likely experiences osmotic stress during the infection process, either on the root hair surface or within the infection thread.
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Affiliation(s)
| | | | | | | | | | | | | | - Gary Stacey
- National Center for Soybean Biotechnology, Division of Plant Sciences (L.B., M.L., S.F., G.S.), and Center for Sustainable Energy, Division of Biochemistry (G.S.), University of Missouri, Columbia, Missouri 65211; Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73401 (Z.L., L.W.S.); Department of Soil, Water, and Climate (M.S., M.J.S.) and Microbial and Plant Genomics Institute, BioTechnology Institute (M.J.S.), University of Minnesota, St. Paul, Minnesota 55108
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