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Huang L, Fu Y, Liu Y, Chen Y, Wang T, Wang M, Lin X, Feng Y. Global insights into endophytic bacterial communities of terrestrial plants: Exploring the potential applications of endophytic microbiota in sustainable agriculture. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 927:172231. [PMID: 38608902 DOI: 10.1016/j.scitotenv.2024.172231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 04/01/2024] [Accepted: 04/03/2024] [Indexed: 04/14/2024]
Abstract
Endophytic microorganisms are indispensable symbionts during plant growth and development and often serve functions such as growth promotion and stress resistance in plants. Therefore, an increasing number of researchers have applied endophytes for multifaceted phytoremediation (e.g., organic pollutants and heavy metals) in recent years. With the availability of next-generation sequencing technologies, an increasing number of studies have shifted the focus from culturable bacteria to total communities. However, information on the composition, structure, and function of bacterial endophytic communities is still not widely synthesized. To explore the general patterns of variation in bacterial communities between plant niches, we reanalyzed data from 1499 samples in 30 individual studies from different continents and provided comprehensive insights. A group of bacterial genera were commonly found in most plant roots and shoots. Our analysis revealed distinct variations in the diversity, composition, structure, and function of endophytic bacterial communities between plant roots and shoots. These variations underscore the sophisticated mechanisms by which plants engage with their endophytic microbiota, optimizing these interactions to bolster growth, health, and resilience against stress. Highlighting the strategic role of endophytic bacteria in promoting sustainable agricultural practices and environmental stewardship, our study not only offers global insights into the endophytic bacterial communities of terrestrial plants but also underscores the untapped potential of these communities as invaluable resources for future research.
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Affiliation(s)
- Lukuan Huang
- Key Laboratory of Environment Remediation and Ecological Health of Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yingyi Fu
- Key Laboratory of Environment Remediation and Ecological Health of Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yaru Liu
- Key Laboratory of Environment Remediation and Ecological Health of Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yijie Chen
- IDEO Play Lab, CA 91006, United States of America
| | - Tingzhang Wang
- Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou 310012, China
| | - Meixia Wang
- Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou 310012, China
| | - Xianyong Lin
- Key Laboratory of Environment Remediation and Ecological Health of Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Ying Feng
- Key Laboratory of Environment Remediation and Ecological Health of Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
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Guha T, Mandal Biswas S. Recent progress in the role of seed endophytic bacteria as plant growth-promoting microorganisms and biocontrol agents. World J Microbiol Biotechnol 2024; 40:218. [PMID: 38806849 DOI: 10.1007/s11274-024-04031-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Accepted: 05/21/2024] [Indexed: 05/30/2024]
Abstract
The importance of microorganisms residing within the host plant for their growth and health is increasingly acknowledged, yet the significance of microbes associated with seeds, particularly seed endophytic bacteria, remains underestimated. Seeds harbor a wide range of bacteria that can boost the growth and resilience of their host plants against environmental challenges. These endophytic associations also offer advantages for germination and seedling establishment, as seed endophytic bacteria are present during the initial stages of plant growth and development. Furthermore, plants can selectively choose bacteria possessing beneficial traits, which are subsequently transmitted through seeds to confer benefits to future generations. Interestingly, even with the ongoing discovery of endophytes in seeds through high-throughput sequencing methods, certain endophytes remain challenging to isolate and culture from seeds, despite their high abundance. These challenges pose difficulties in studying seed endophytes, making many of their effects on plants unclear. In this article, a framework for understanding the assembly and function of seed endophytes, including their sources and colonization processes was outlined in detail and available research on bacterial endophytes discovered within the seeds of various plant species has also been explored. Thus, this current review aims to provide valuable insights into the mechanism of underlying seed endophytic bacteria-host plant interactions and offers significant recommendations for utilizing the seed endophytic bacteria in sustainable agriculture as plant growth promoters and enhancers of environmental stress tolerance.
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Affiliation(s)
- Titir Guha
- Agricultural & Ecological Research Unit, Biological Sciences Division, Indian Statistical Institute, 203, Barrackpore Trunk Road, Kolkata, 700 108, India
| | - Suparna Mandal Biswas
- Agricultural & Ecological Research Unit, Biological Sciences Division, Indian Statistical Institute, 203, Barrackpore Trunk Road, Kolkata, 700 108, India.
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Khan AL. Silicon: A valuable soil element for improving plant growth and CO 2 sequestration. J Adv Res 2024:S2090-1232(24)00217-0. [PMID: 38806098 DOI: 10.1016/j.jare.2024.05.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 05/21/2024] [Accepted: 05/23/2024] [Indexed: 05/30/2024] Open
Abstract
BACKGROUND Silicon (Si), the second most abundant and quasi-essential soil element, is locked as a recalcitrant silicate mineral in the Earth's crust. The physical abundance of silicates can play an essential role in increasing plant productivity. Plants store Si as biogenic silica (phytoliths), which is mobilized through a chemical weathering process in the soil. AIM OF REVIEW Although Si is a critical element for plant growth, there is still a considerable need to understand its dissolution, uptake, and translocation in agroecosystems. Here, we show recent progress in understanding the interactome of Si, CO2, the microbiome, and soil chemistry, which can sustainably govern silicate dissolution and cycling in agriculture. KEY SCIENTIFIC CONCEPTS OF THIS REVIEW Si cycling is directly related to carbon cycling, and the resulting climate stability can be enhanced by negative feedback between atmospheric CO2 and the silicate uptake process. Improved Si mobilization in the rhizosphere by the presence of reactive elements (for example, Ca, Na, Al, Zn, and Fe) and Si uptake through genetic transporters in plants are crucial to achieving the dual objectives of (i) enhancing crop productivity and (ii) abiotic stress tolerance. Furthermore, the microbiome is a symbiotic partner of plants. Bacterial and fungal microbiomes can solubilize silicate minerals through intriguingly complex bioweathering mechanisms by producing beneficial metabolites and enzymes. However, the interaction of Si with CO2 and the microbiome's function in mobilization have been understudied. This review shows that enhancing our understanding of Si, CO2, the microbiome, and soil chemistry can help in sustainable crop production during climatic stress events.
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Affiliation(s)
- Abdul Latif Khan
- Department of Engineering Technology, University of Houston, Houston, TX, USA.
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Luo DL, Huang SY, Ma CY, Zhang XY, Sun K, Zhang W, Dai CC. Seed-borne bacterial synthetic community resists seed pathogenic fungi and promotes plant growth. J Appl Microbiol 2024; 135:lxae073. [PMID: 38520150 DOI: 10.1093/jambio/lxae073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 02/21/2024] [Accepted: 03/21/2024] [Indexed: 03/25/2024]
Abstract
AIMS In this study, the control effects of synthetic microbial communities composed of peanut seed bacteria against seed aflatoxin contamination caused by Aspergillus flavus and root rot by Fusarium oxysporum were evaluated. METHODS AND RESULTS Potentially conserved microbial synthetic communities (C), growth-promoting synthetic communities (S), and combined synthetic communities (CS) of peanut seeds were constructed after 16S rRNA Illumina sequencing, strain isolation, and measurement of plant growth promotion indicators. Three synthetic communities showed resistance to root rot and CS had the best effect after inoculating into peanut seedlings. This was achieved by increased defense enzyme activity and activated salicylic acid (SA)-related, systematically induced resistance in peanuts. In addition, CS also inhibited the reproduction of A. flavus on peanut seeds and the production of aflatoxin. These effects are related to bacterial degradation of toxins and destruction of mycelia. CONCLUSIONS Inoculation with a synthetic community composed of seed bacteria can help host peanuts resist the invasion of seeds by A. flavus and seedlings by F. oxysporum and promote the growth of peanut seedlings.
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Affiliation(s)
- De-Lin Luo
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology and Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu 210023, China
| | - Shi-Yi Huang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology and Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu 210023, China
| | - Chen-Yu Ma
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology and Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu 210023, China
| | - Xiang-Yu Zhang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology and Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu 210023, China
| | - Kai Sun
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology and Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu 210023, China
| | - Wei Zhang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology and Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu 210023, China
| | - Chuan-Chao Dai
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology and Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu 210023, China
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Bhattacharya E, Hazra A, Dutta M, Bose R, Dutta A, Dandapat M, Guha T, Mandal Biswas S. Novel report of Acinetobacter johnsonii as an indole-producing seed endophyte in Tamarindus indica L. Arch Microbiol 2024; 206:144. [PMID: 38460008 DOI: 10.1007/s00203-024-03865-0] [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: 10/31/2023] [Revised: 01/23/2024] [Accepted: 01/23/2024] [Indexed: 03/11/2024]
Abstract
Plant-microbe associations have been regarded as an exciting topic of research due to their potential as environment friendly alternatives for stimulating crop growth and development. Seeds of Tamarindus indica L. have been chosen for the present study as seed endophytes prefer larger or nutritive cotyledon and hard seed coats for their colonization. The main objectives of our study were to isolate and identify the seed endophytes, their bioefficacy, and responsible chemical compounds. In a dose-dependent experiment, tamarind seed exudates (TSE) showed plant growth-promoting properties on Oryza sativa (53-81%), Daucus carota (10-31%), and Raphanus sativa (21-42%). Identification of the bacterial load in TSE through 16S rRNA sequencing revealed the existence of two bacterial species, Acinetobacter johnsonii and Niallia nealsonii. This is the first report of these two bacteria as seed endophytes of Tamarindus indica L. HRLC-MS analysis of TSE confirmed the presence of indole derivatives, primarily indole-3-lactic acid (ILA). The quantitative phytochemical estimation of bacterial culture filtrates revealed that indole-like substances were present in the extracts only in A. johnsonii at a concentration of 0.005 mg/ml of indole acetic acid equivalent. Experimental results suggested that the stimulatory activity of TSE was caused by the presence of A. johnsonii, a potential plant growth-promoting bacteria that produced indole-like compounds. This study suggests tamarind seed exudates with its endophytic microbiota as a potent plant growth-promoting agent that may find use as a cheap and sustainable source of metabolites useful in the agro-industries.
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Affiliation(s)
- Ekta Bhattacharya
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata, 700108, India.
| | - Anjan Hazra
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata, 700108, India
| | - Madhurima Dutta
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata, 700108, India
| | - Rahul Bose
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata, 700108, India
| | - Anisha Dutta
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata, 700108, India
| | - Moumita Dandapat
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata, 700108, India
| | - Titir Guha
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata, 700108, India
| | - Suparna Mandal Biswas
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata, 700108, India.
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Dumigan CR, Deyholos MK. Soil and seed both influence bacterial diversity in the microbiome of the Cannabis sativa seedling endosphere. FRONTIERS IN PLANT SCIENCE 2024; 15:1326294. [PMID: 38450399 PMCID: PMC10914941 DOI: 10.3389/fpls.2024.1326294] [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: 10/23/2023] [Accepted: 02/02/2024] [Indexed: 03/08/2024]
Abstract
Introduction Phytobiomes have a significant impact on plant health. The microbiome of Cannabis sativa is particularly interesting both because of renewed interest in this crop and because it is commercially propagated in two different ways (i.e. clonally and by seed). Angiosperms obtain a founding population of seed-borne endophytes from their seed-bearing parent. This study examines the influence of both seed and soil-derived bacteria on the endospheres of cannabis seedlings of both hemp- and drug-types. Methods A multi-factorial metagenomic study was conducted with three cannabis genotypes and two soil sources, which were tested both before and after autoclave sterilization. Seedlings were grown on soil, then rinsed and surface-sterilized, and 16S rDNA amplicons from seedling endophytes were sequenced, taxonomically classified, and used to estimate alpha- and beta-diversity in Qiime2. The statistical significance of differences in seedling microbiomes across treatments was tested, and PiCRUST2 was used to infer the functional relevance of these differences. Results Soil was found to have a profound effect on the alpha-diversity, beta-diversity, relative abundance, and functional genes of endophytic bacteria in germinating cannabis seedlings. Additionally, there was a significant effect of cannabis genotype on beta diversity, especially when genotypes were grown in sterilized soil. Gammaproteobacteria and Bacilli were the two most abundant taxa and were found in all genotypes and soil types, including sterilized soil. Discussion The results indicated that a component of cannabis seedling endosphere microbiomes is seed-derived and conserved across the environments tested. Functional prediction of seedling endophytes using piCRUST suggested a number of important functions of seed-borne endophytes in cannabis including nutrient and amino acid cycling, hormone regulation, and as precursors to antibiotics. This study suggested both seed and soil play a critical role in shaping the microbiome of germinating cannabis seedlings.
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Affiliation(s)
| | - Michael K. Deyholos
- Department of Biology, Faculty of Science, University of British Columbia, Kelowna, BC, Canada
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Zhong L, Niu B, Xiang D, Wu Q, Peng L, Zou L, Zhao J. Endophytic fungi in buckwheat seeds: exploring links with flavonoid accumulation. Front Microbiol 2024; 15:1353763. [PMID: 38444811 PMCID: PMC10912284 DOI: 10.3389/fmicb.2024.1353763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 02/02/2024] [Indexed: 03/07/2024] Open
Abstract
Buckwheat is a famous edible and medicinal coarse cereal which contain abundant of bioactive flavonoids, such as rutin. In this study, the composition and diversity of endophytic fungi in eight different buckwheat seeds were analyzed by high-throughput sequencing of ITS rDNA. Results showed that, the fungal sequences reads were allocated to 272 OTUs, of them, 49 OTUs were shared in eight buckwheat seeds. These endophytic fungi could be classified into 6 phyla, 19 classes, 41 orders, 79 families, 119 genera, and 191 species. At genus level, Alternaria sp. was the domain fungal endophyte. Besides, fungal endophytes belonged to the genera of Epicocum, Cladosporium, Botrytis, Filbobasidium, Stemphylium, and Vishniacozyma were highly abundant in buckwheat seeds. The total flavonoids and rutin contents in tartary buckwheat cultivars (CQ, XQ, CH, K2) were much higher than those in common buckwheat cultivars (HT, T2, T4, T8). For tartary buckwheat cultivars, the total flavonoids and rutin contents were ranging from 2.6% to 3.3% and 0.9% to 1.3%, respectively. Accordingly, the tartary buckwheat samples displayed stronger antioxidant activity than the common buckwheat. Spearman correlation heat map analysis was successfully found that certain fungal species from the genera of Alternaria, Botryosphaeria, Colletorichum and Diymella exhibited significant positive correlation with flavonoids contents. Results of this study preliminary revealed the fungi-plant interaction relationship at secondary metabolite level, and could provide novel strategy for increasing the flavonoids accumulation of buckwheat seeds, as well as improving their quality.
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Affiliation(s)
- Lingyun Zhong
- College of Preclinical Medicine, Chengdu University, Chengdu, China
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Chengdu, China
| | - Bei Niu
- College of Preclinical Medicine, Chengdu University, Chengdu, China
| | - Dabing Xiang
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Chengdu, China
| | - Qi Wu
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Chengdu, China
| | - Lianxin Peng
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Chengdu, China
| | - Liang Zou
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Chengdu, China
| | - Jianglin Zhao
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Chengdu, China
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Yang J, Xie J, Chen H, Zhu S, Hou X, Zhang Z. Diversity and Biological Characteristics of Seed-Borne Bacteria of Achnatherum splendens. Microorganisms 2024; 12:339. [PMID: 38399743 PMCID: PMC10892246 DOI: 10.3390/microorganisms12020339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 01/29/2024] [Accepted: 02/01/2024] [Indexed: 02/25/2024] Open
Abstract
As a high-quality plant resource for ecological restoration, Achnatherum splendens has strong adaptability and wide distribution. It is a constructive species of alkaline grassland in Northwest China. The close relationship between seed-borne bacteria and seeds causes a specific co-evolutionary effect which can enhance the tolerance of plants under various stresses. In this study, 272 bacterial isolates were isolated from the seeds of Achnatherum splendens in 6 different provinces of China. In total, 41 dominant strains were identified, and their motility, biofilm formation ability and antibiotic resistance were analyzed. The results showed that the bacteria of Achnatherum splendens belonged to 3 phyla and 14 genera, of which Firmicutes was the dominant phylum and Bacillus was the dominant genus. The motility and biofilm formation ability of the isolated strains were studied. It was found that there were six strains with a moving diameter greater than 8 cm. There were 16 strains with strong biofilm formation ability, among which Bacillus with biofilm formation ability was the most common, accounting for 37.5%. The analysis of antibiotic resistance showed that sulfonamides had stronger antibacterial ability to strains. Correlation analysis showed that the resistance of strains to aminoglycosides (kanamycin, amikacin, and gentamicin) was significantly positively correlated with their biofilm formation ability. This study provides fungal resources for improving the tolerance of plants under different stresses. In addition, this is the first report on the biological characteristics of bacteria in Achnatherum splendens.
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Affiliation(s)
| | | | | | | | | | - Zhenfen Zhang
- Key Laboratory of Grassland Ecosystem, Ministry of Education, Pratacultural College, Gansu Agricultural University, Lanzhou 730070, China; (J.Y.); (J.X.); (H.C.); (S.Z.); (X.H.)
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Kumar A, Solanki MK, Wang Z, Solanki AC, Singh VK, Divvela PK. Revealing the seed microbiome: Navigating sequencing tools, microbial assembly, and functions to amplify plant fitness. Microbiol Res 2024; 279:127549. [PMID: 38056172 DOI: 10.1016/j.micres.2023.127549] [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: 09/03/2023] [Revised: 11/10/2023] [Accepted: 11/12/2023] [Indexed: 12/08/2023]
Abstract
Microbial communities within seeds play a vital role in transmitting themselves to the next generation of plants. These microorganisms significantly impact seed vigor and early seedling growth, for successful crop establishment. Previous studies reported on seed-associated microbial communities and their influence on processes like dormancy release, germination, and disease protection. Modern sequencing and conventional methods reveal microbial community structures and environmental impacts, these information helps in microbial selection and manipulation. These studies form the foundation for using seed microbiomes to enhance crop resilience and productivity. While existing research has primarily focused on characterizing microbiota in dried mature seeds, a significant gap exists in understanding how these microbial communities assemble during seed development. The review also discusses applying seed-associated microorganisms to improve crops in the context of climate change. However, limited knowledge is available about the microbial assembly pattern on seeds, and their impact on plant growth. The review provides insight into microbial composition, functions, and significance for plant health, particularly regarding growth promotion and pest control.
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Affiliation(s)
- Ajay Kumar
- Amity Institute of Biotechnology, Amity University, Sector-125, Noida, Uttar Pradesh 201313, India
| | - Manoj Kumar Solanki
- Department of Life Sciences and Biological Sciences, IES University, Bhopal, Madhya Pradesh, India; Plant Cytogenetics and Molecular Biology Group, Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Katowice, Poland.
| | - Zhen Wang
- Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology, Agricultural College, Yulin Normal University, Yulin 537000, China
| | - Anjali Chandrol Solanki
- Department of Agriculture, Mansarover Global University, Bhopal, Madhya Pradesh 462042, India
| | - Vipin Kumar Singh
- Department of Botany, K.S. Saket P.G. College, Ayodhya 224123, Uttar Pradesh, India
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Shi T, Shi M, Ye Y, Yue Y, Wang L, Yang X. Floral Volatile Organic Compounds Change the Composition and Function of the Endophytic Fungal Community in the Flowers of Osmanthus fragrans. Int J Mol Sci 2024; 25:857. [PMID: 38255929 PMCID: PMC10815108 DOI: 10.3390/ijms25020857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 12/27/2023] [Accepted: 01/05/2024] [Indexed: 01/24/2024] Open
Abstract
Endophytic fungi in flowers influence plant health and reproduction. However, whether floral volatile organic compounds (VOCs) affect the composition and function of the endophytic fungal community remains unclear. Here, gas chromatography-mass spectrometry (GC-MS) and high-throughput sequencing were used to explore the relationship between floral VOCs and the endophytic fungal community during different flower development stages in Osmanthus fragrans 'Rixiang Gui'. The results showed that the composition of the endophytic fungal community and floral VOCs shifted along with flowering development. The highest and lowest α diversity of the endophytic fungal community occurred in the flower fading stage and full blooming stage, respectively. The dominant fungi, including Dothideomycetes (class), Pleosporales (order), and Neocladophialophora, Alternaria, and Setophoma (genera), were enriched in the flower fading stage and decreased in the full blooming stage, demonstrating the enrichment of the Pathotroph, Saprotroph, and Pathotroph-Saprotroph functions in the flower fading stage and their depletion in the full blooming stage. However, the total VOC and terpene contents were highest in the full blooming stage and lowest in the flower fading stage, which was opposite to the α diversity of the endophytic fungal community and the dominant fungi during flowering development. Linalool, dihydro-β-ionone, and trans-linalool oxide(furan) were key factors affecting the endophytic fungal community composition. Furthermore, dihydro-β-ionone played an extremely important role in inhibiting endophytic fungi in the full blooming stage. Based on the above results, it is believed that VOCs, especially terpenes, changed the endophytic fungal community composition in the flowers of O. fragrans 'Rixiang Gui'. These findings improve the understanding of the interaction between endophytic fungi and VOCs in flowers and provide new insight into the mechanism of flower development.
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Affiliation(s)
- Tingting Shi
- Key Laboratory of Landscape Architecture, Jiangsu Province, College of Landscape Architecture, Nanjing Forestry University, Nanjing 210037, China; (T.S.); (Y.Y.); (Y.Y.); (L.W.)
| | - Man Shi
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
| | - Yunfang Ye
- Key Laboratory of Landscape Architecture, Jiangsu Province, College of Landscape Architecture, Nanjing Forestry University, Nanjing 210037, China; (T.S.); (Y.Y.); (Y.Y.); (L.W.)
| | - Yuanzheng Yue
- Key Laboratory of Landscape Architecture, Jiangsu Province, College of Landscape Architecture, Nanjing Forestry University, Nanjing 210037, China; (T.S.); (Y.Y.); (Y.Y.); (L.W.)
| | - Lianggui Wang
- Key Laboratory of Landscape Architecture, Jiangsu Province, College of Landscape Architecture, Nanjing Forestry University, Nanjing 210037, China; (T.S.); (Y.Y.); (Y.Y.); (L.W.)
| | - Xiulian Yang
- Key Laboratory of Landscape Architecture, Jiangsu Province, College of Landscape Architecture, Nanjing Forestry University, Nanjing 210037, China; (T.S.); (Y.Y.); (Y.Y.); (L.W.)
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11
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Sanhueza T, Hernández I, Sagredo-Sáez C, Villanueva-Guerrero A, Alvarado R, Mujica MI, Fuentes-Quiroz A, Menendez E, Jorquera-Fontena E, Valadares RBDS, Herrera H. Juvenile Plant-Microbe Interactions Modulate the Adaptation and Response of Forest Seedlings to Rapid Climate Change. PLANTS (BASEL, SWITZERLAND) 2024; 13:175. [PMID: 38256729 PMCID: PMC10819047 DOI: 10.3390/plants13020175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 10/02/2023] [Accepted: 10/13/2023] [Indexed: 01/24/2024]
Abstract
The negative impacts of climate change on native forest ecosystems have created challenging conditions for the sustainability of natural forest regeneration. These challenges arise primarily from abiotic stresses that affect the early stages of forest tree development. While there is extensive evidence on the diversity of juvenile microbial symbioses in agricultural and fruit crops, there is a notable lack of reports on native forest plants. This review aims to summarize the critical studies conducted on the diversity of juvenile plant-microbe interactions in forest plants and to highlight the main benefits of beneficial microorganisms in overcoming environmental stresses such as drought, high and low temperatures, metal(loid) toxicity, nutrient deficiency, and salinity. The reviewed studies have consistently demonstrated the positive effects of juvenile plant-microbiota interactions and have highlighted the potential beneficial attributes to improve plantlet development. In addition, this review discusses the beneficial attributes of managing juvenile plant-microbiota symbiosis in the context of native forest restoration, including its impact on plant responses to phytopathogens, promotion of nutrient uptake, facilitation of seedling adaptation, resource exchange through shared hyphal networks, stimulation of native soil microbial communities, and modulation of gene and protein expression to enhance adaptation to adverse environmental conditions.
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Affiliation(s)
- Tedy Sanhueza
- Laboratorio de Silvicultura, Departamento de Ciencias Forestales, Facultad de Ciencias Agropecuarias y Medioambiente, Universidad de La Frontera, Temuco 4811230, Chile; (T.S.); (C.S.-S.); (A.V.-G.); (R.A.); (A.F.-Q.)
| | - Ionel Hernández
- Plant Physiology and Biochemistry Department, National Institute of Agricultural Science, Carretera a Tapaste Km 3 y ½, San José de las Lajas 32700, Mayabeque, Cuba;
| | - Cristiane Sagredo-Sáez
- Laboratorio de Silvicultura, Departamento de Ciencias Forestales, Facultad de Ciencias Agropecuarias y Medioambiente, Universidad de La Frontera, Temuco 4811230, Chile; (T.S.); (C.S.-S.); (A.V.-G.); (R.A.); (A.F.-Q.)
| | - Angela Villanueva-Guerrero
- Laboratorio de Silvicultura, Departamento de Ciencias Forestales, Facultad de Ciencias Agropecuarias y Medioambiente, Universidad de La Frontera, Temuco 4811230, Chile; (T.S.); (C.S.-S.); (A.V.-G.); (R.A.); (A.F.-Q.)
| | - Roxana Alvarado
- Laboratorio de Silvicultura, Departamento de Ciencias Forestales, Facultad de Ciencias Agropecuarias y Medioambiente, Universidad de La Frontera, Temuco 4811230, Chile; (T.S.); (C.S.-S.); (A.V.-G.); (R.A.); (A.F.-Q.)
| | - Maria Isabel Mujica
- Instituto de Ciencias Ambientales y Evolutivas, Universidad Austral de Chile, Valdivia 5110566, Chile;
| | - Alejandra Fuentes-Quiroz
- Laboratorio de Silvicultura, Departamento de Ciencias Forestales, Facultad de Ciencias Agropecuarias y Medioambiente, Universidad de La Frontera, Temuco 4811230, Chile; (T.S.); (C.S.-S.); (A.V.-G.); (R.A.); (A.F.-Q.)
| | - Esther Menendez
- Departamento de Microbiología y Genética, Instituto de Investigación en Agrobiotecnología (CIALE), Universidad de Salamanca, 37008 Salamanca, Spain;
| | - Emilio Jorquera-Fontena
- Departamento de Ciencias Agropecuarias y Acuícolas, Facultad de Recursos Naturales, Universidad Catolica de Temuco, Temuco P.O. Box 15-D, Chile;
| | | | - Héctor Herrera
- Laboratorio de Silvicultura, Departamento de Ciencias Forestales, Facultad de Ciencias Agropecuarias y Medioambiente, Universidad de La Frontera, Temuco 4811230, Chile; (T.S.); (C.S.-S.); (A.V.-G.); (R.A.); (A.F.-Q.)
- Laboratorio de Ecosistemas y Bosques, Departamento de Ciencias Forestales, Facultad de Ciencias Agropecuarias y Medioambiente, Universidad de La Frontera, Temuco 4811230, Chile
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12
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Song J, Wang D, Han D, Zhang DD, Li R, Kong ZQ, Dai XF, Subbarao KV, Chen JY. Characterization of the Endophytic Bacillus subtilis KRS015 Strain for Its Biocontrol Efficacy Against Verticillium dahliae. PHYTOPATHOLOGY 2024; 114:61-72. [PMID: 37530500 DOI: 10.1094/phyto-04-23-0142-r] [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: 08/03/2023]
Abstract
Endophytes play important roles in promoting plant growth and controlling plant diseases. Verticillium wilt is a vascular wilt disease caused by Verticillium dahliae, a widely distributed soilborne pathogen that causes significant economic losses on cotton each year. In this study, an endophyte KRS015, isolated from the seed of the Verticillium wilt-resistant Gossypium hirsutum 'Zhongzhimian No. 2', was identified as Bacillus subtilis by morphological, phylogenetic, physiological, and biochemical analyses. The volatile organic compounds (VOCs) produced by KRS015 or its cell-free fermentation extract had significant antagonistic effects on various pathogenic fungi, including V. dahliae. KRS015 reduced Verticillium wilt index and colonization of V. dahliae in treated cotton seedlings significantly; the disease reduction rate was ∼62%. KRS015 also promoted plant growth, potentially mediated by the growth-related cotton genes GhACL5 and GhCPD-3. The cell-free fermentation extract of KRS015 triggered a hypersensitivity response, including reactive oxygen species (ROS) and expression of resistance-related plant genes. VOCs from KRS015 also inhibited germination of conidia and the mycelial growth of V. dahliae, and were mediated by growth and development-related genes such as VdHapX, VdMcm1, Vdpf, and Vel1. These results suggest that KRS015 is a potential agent for controlling Verticillium wilt and promoting growth of cotton.
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Affiliation(s)
- Jian Song
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Dan Wang
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Dongfei Han
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Dan-Dan Zhang
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Western Agricultural Research Center, Chinese Academy of Agricultural Sciences, Changji 831100, China
| | - Ran Li
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Western Agricultural Research Center, Chinese Academy of Agricultural Sciences, Changji 831100, China
| | - Zhi-Qiang Kong
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Western Agricultural Research Center, Chinese Academy of Agricultural Sciences, Changji 831100, China
| | - Xiao-Feng Dai
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Western Agricultural Research Center, Chinese Academy of Agricultural Sciences, Changji 831100, China
| | - Krishna V Subbarao
- Department of Plant Pathology, University of California, Davis, c/o U.S. Agricultural Research Station, Salinas, CA 93905
| | - Jie-Yin Chen
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Western Agricultural Research Center, Chinese Academy of Agricultural Sciences, Changji 831100, China
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13
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Zeng Q, Zhao Y, Shen W, Han D, Yang M. Seed-to-Seed: Plant Core Vertically Transmitted Microbiota. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:19255-19264. [PMID: 38044571 DOI: 10.1021/acs.jafc.3c07092] [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: 12/05/2023]
Abstract
The plant core microbiota transmitted by seeds have been demonstrated to exist in seeds and adult plants of several crops for multiple generations. They are closely related to plants and are relatively conserved throughout evolution, domestication, and breeding. These microbiota play a vital role in the early stages of plant growth. However, information about their colonization routes, transmission pathways, and final fate remains fragmentary. This review delves into the concept of these microbiota, their colonization sources, transmission pathways, and how they change throughout plant evolution, domestication, and breeding, as well as their effects on plants, based on relevant literature. Finally, the significant potential of incorporating the practical application of seed-transmitted microbiota into plant microbial breeding is emphasized.
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Affiliation(s)
- Quan Zeng
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yang Zhao
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Wei Shen
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Dejun Han
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Mingming Yang
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
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14
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Ważny R, Jędrzejczyk RJ, Domka A, Pliszko A, Kosowicz W, Githae D, Rozpądek P. How does metal soil pollution change the plant mycobiome? Environ Microbiol 2023; 25:2913-2930. [PMID: 37127295 DOI: 10.1111/1462-2920.16392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 04/10/2023] [Indexed: 05/03/2023]
Abstract
Microorganisms play a key role in plant adaptation to the environment. The aim of this study was to evaluate the effect of toxic metals present in the soil on the biodiversity of plant-related, endophytic mycobiota. The mycobiome of plants and soil from a Zn-Pb heap and a metal-free ruderal area were compared via Illumina sequencing of the ITS1 rDNA. The biodiversity of plants and fungi inhabiting mine dump substrate was lower than that of the metal free site. In the endosphere of Arabidopsis arenosa from the mine dump the number of endophytic fungal taxa was comparable to that in the reference population, but the community structure significantly differed. Agaricomycetes was the most notably limited class of fungi. The results of plant mycobiota evaluation from the field study were verified in terms of the role of toxic metals in plant endophytic fungi community assembly in a reconstruction experiment. The results presented in this study indicate that metal toxicity affects the structure of the plant mycobiota not by changing the pool of microorganisms available in the soil from which the fungal symbionts are recruited but most likely by altering plant and fungi behaviour and the organisms' preferences towards associating in symbiotic relationships.
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Affiliation(s)
- Rafał Ważny
- Małopolska Centre of Biotechnology, Jagiellonian University in Kraków, Kraków, Poland
| | - Roman J Jędrzejczyk
- Małopolska Centre of Biotechnology, Jagiellonian University in Kraków, Kraków, Poland
| | - Agnieszka Domka
- Małopolska Centre of Biotechnology, Jagiellonian University in Kraków, Kraków, Poland
- W. Szafer Institute of Botany Polish Academy of Sciences, Kraków, Poland
| | - Artur Pliszko
- Institute of Botany, Jagiellonian University in Kraków, Kraków, Poland
| | - Weronika Kosowicz
- Małopolska Centre of Biotechnology, Jagiellonian University in Kraków, Kraków, Poland
- Doctoral School of Exact and Natural Sciences, Jagiellonian University in Kraków, Kraków, Poland
| | - Dedan Githae
- Małopolska Centre of Biotechnology, Jagiellonian University in Kraków, Kraków, Poland
- Doctoral School of Exact and Natural Sciences, Jagiellonian University in Kraków, Kraków, Poland
| | - Piotr Rozpądek
- Małopolska Centre of Biotechnology, Jagiellonian University in Kraków, Kraków, Poland
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15
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Pandey P, Tripathi A, Dwivedi S, Lal K, Jhang T. Deciphering the mechanisms, hormonal signaling, and potential applications of endophytic microbes to mediate stress tolerance in medicinal plants. FRONTIERS IN PLANT SCIENCE 2023; 14:1250020. [PMID: 38034581 PMCID: PMC10684941 DOI: 10.3389/fpls.2023.1250020] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 10/30/2023] [Indexed: 12/02/2023]
Abstract
The global healthcare market in the post-pandemic era emphasizes a constant pursuit of therapeutic, adaptogenic, and immune booster drugs. Medicinal plants are the only natural resource to meet this by supplying an array of bioactive secondary metabolites in an economic, greener and sustainable manner. Driven by the thrust in demand for natural immunity imparting nutraceutical and life-saving plant-derived drugs, the acreage for commercial cultivation of medicinal plants has dramatically increased in recent years. Limited resources of land and water, low productivity, poor soil fertility coupled with climate change, and biotic (bacteria, fungi, insects, viruses, nematodes) and abiotic (temperature, drought, salinity, waterlogging, and metal toxicity) stress necessitate medicinal plant productivity enhancement through sustainable strategies. Plants evolved intricate physiological (membrane integrity, organelle structural changes, osmotic adjustments, cell and tissue survival, reclamation, increased root-shoot ratio, antibiosis, hypersensitivity, etc.), biochemical (phytohormones synthesis, proline, protein levels, antioxidant enzymes accumulation, ion exclusion, generation of heat-shock proteins, synthesis of allelochemicals. etc.), and cellular (sensing of stress signals, signaling pathways, modulating expression of stress-responsive genes and proteins, etc.) mechanisms to combat stresses. Endophytes, colonizing in different plant tissues, synthesize novel bioactive compounds that medicinal plants can harness to mitigate environmental cues, thus making the agroecosystems self-sufficient toward green and sustainable approaches. Medicinal plants with a host set of metabolites and endophytes with another set of secondary metabolites interact in a highly complex manner involving adaptive mechanisms, including appropriate cellular responses triggered by stimuli received from the sensors situated on the cytoplasm and transmitting signals to the transcriptional machinery in the nucleus to withstand a stressful environment effectively. Signaling pathways serve as a crucial nexus for sensing stress and establishing plants' proper molecular and cellular responses. However, the underlying mechanisms and critical signaling pathways triggered by endophytic microbes are meager. This review comprehends the diversity of endophytes in medicinal plants and endophyte-mediated plant-microbe interactions for biotic and abiotic stress tolerance in medicinal plants by understanding complex adaptive physiological mechanisms and signaling cascades involving defined molecular and cellular responses. Leveraging this knowledge, researchers can design specific microbial formulations that optimize plant health, increase nutrient uptake, boost crop yields, and support a resilient, sustainable agricultural system.
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Affiliation(s)
- Praveen Pandey
- Microbial Technology Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
- Division of Plant Breeding and Genetic Resource Conservation, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Arpita Tripathi
- Microbial Technology Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
- Faculty of Education, Teerthanker Mahaveer University, Moradabad, India
| | - Shweta Dwivedi
- Division of Plant Breeding and Genetic Resource Conservation, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Kanhaiya Lal
- Division of Plant Breeding and Genetic Resource Conservation, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Tripta Jhang
- Division of Plant Breeding and Genetic Resource Conservation, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
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16
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Juby S, Krishnankutty RE, Kochupurakkal J. Drought-Alleviating Effects of Endophytic Bacteria Isolated from Xerophytic Plants on Capsicum annuum L. Seedlings. Curr Microbiol 2023; 80:403. [PMID: 37930407 DOI: 10.1007/s00284-023-03494-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 09/24/2023] [Indexed: 11/07/2023]
Abstract
In the current study, 51 endophytic bacteria were isolated from 5 different xerophytic plants. Their drought tolerance properties were screened in vitro, and from these, four endophytes with tolerance up to - 1.5 MPa water potential were further selected and identified as Acinetobacter sp. Eo3, Pseudomonas sp. Ni5, Bacillus safensis Ni7, and Stenotrophomonas sp. C3. Due to biosafety concern, Acinetobacter sp. Eo3 and Pseudomonas sp. Ni5 were excluded from further investigation, while B. safensis Ni7 and Stenotrophomonas sp. C3 were subjected to detailed study. The drought tolerance properties of these endophytes were evaluated in vivo using Capsicum annuum L. by analysing the growth parameters (leaf number, root number, shoot length, and plant fresh weight) as well as physiological and biochemical parameters (stomatal index, relative water content, chlorophyll content, and carbohydrate accumulation) of bacteria-treated and control seedlings. Here, treatment with B. safensis Ni7 and Stenotrophomonas sp. C3 was found to result in statistically significant enhancement (P ≤ 0.001) of the measured parameters of plants when compared with the control groups. In the case of fresh weight itself, Ni7 and C3 treatment was found to result in values of 157.76 and 142.8 mg, respectively, and was statistically significant enhancement as the same for nutrient broth and distilled water control were 73.3 mg and 70.5 mg only. Additionally, the endophyte-treated seedlings displayed significant improvement in other growth parameters even under induced drought stress. These findings highlight the potential of xerophytic-derived bacterial endophytes to have significant role in mitigating the drought stress effects in plants with the promises for field application.
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Affiliation(s)
- Silju Juby
- School of Biosciences, Mahatma Gandhi University, PD Hills (PO), Kottayam, Kerala, 686 560, India
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17
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Wang YL, Zhang HB. Assembly and Function of Seed Endophytes in Response to Environmental Stress. J Microbiol Biotechnol 2023; 33:1119-1129. [PMID: 37311706 PMCID: PMC10580892 DOI: 10.4014/jmb.2303.03004] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 05/04/2023] [Accepted: 05/17/2023] [Indexed: 06/15/2023]
Abstract
Seeds are colonized by diverse microorganisms that can improve the growth and stress resistance of host plants. Although understanding the mechanisms of plant endophyte-host plant interactions is increasing, much of this knowledge does not come from seed endophytes, particularly under environmental stress that the plant host grows to face, including biotic (e.g., pathogens, herbivores and insects) and abiotic factors (e.g., drought, heavy metals and salt). In this article, we first provided a framework for the assembly and function of seed endophytes and discussed the sources and assembly process of seed endophytes. Following that, we reviewed the impact of environmental factors on the assembly of seed endophytes. Lastly, we explored recent advances in the growth promotion and stress resistance enhancement of plants, functioning by seed endophytes under various biotic and abiotic stressors.
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Affiliation(s)
- Yong-Lan Wang
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming 650091, P.R. China
| | - Han-Bo Zhang
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming 650091, P.R. China
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18
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Hernández I, Taulé C, Pérez-Pérez R, Battistoni F, Fabiano E, Villanueva-Guerrero A, Nápoles MC, Herrera H. Endophytic Seed-Associated Bacteria as Plant Growth Promoters of Cuban Rice ( Oryza sativa L.). Microorganisms 2023; 11:2317. [PMID: 37764161 PMCID: PMC10537011 DOI: 10.3390/microorganisms11092317] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 08/19/2023] [Accepted: 08/24/2023] [Indexed: 09/29/2023] Open
Abstract
Cuban rice cultivars INCA LP-5 and INCA LP-7 are widely distributed in Cuba and Caribbean countries. Although there are studies about rhizospheric bacteria associated with these cultivars, there are no reports about their seed-associated bacteria. This study aimed to isolate endophytic bacteria from rice seeds and select those with the greatest plant growth-promoting traits. A total of nineteen bacterial strains from the genera Pantoea, Bacillus, Paenibacillus, and Pseudomonas were isolated from the husk and endosperm of rice seeds. The strains Pantoea sp. S5-1, Pseudomonas sp. S5-38, and Pseudomonas sp. S7-1 were classified as the most promissory to increase rice growth as they demonstrated the presence of multiple plant growth-promoting traits such as the production of auxins, phosphate, and potassium solubilization, the production of siderophores, and the inhibition of the phytopathogen Pyricularia oryzae. The inoculation of strains of Pantoea sp. and Pseudomonas spp. in rice improves the height, root length, fresh weight, and dry weight of the shoot and root after 21 days post-inoculation in hydroponic assays. This study constitutes the first report on Cuban rice cultivars about the presence of endophytes in seeds and their potential to promote seedling growth. Pantoea sp. S5-1, Pseudomonas sp. S5-38, and Pseudomonas sp. S7-1 were selected as the more promising strains for the development of bio-stimulators or bio-inoculants for Cuban rice crops.
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Affiliation(s)
- Ionel Hernández
- National Institute of Agricultural Science, Plant Physiology and Biochemistry Department, Carretera a Tapaste Km 3 y ½, San José de las Lajas 32700, Mayabeque, Cuba; (R.P.-P.); (M.C.N.)
| | - Cecilia Taulé
- Biological Research Institute Clemente Estable, Microbial Biochemistry and Genomics Department, Avenida Italia 3318, Montevideo 11600, Uruguay; (C.T.); (F.B.); (E.F.)
| | - Reneé Pérez-Pérez
- National Institute of Agricultural Science, Plant Physiology and Biochemistry Department, Carretera a Tapaste Km 3 y ½, San José de las Lajas 32700, Mayabeque, Cuba; (R.P.-P.); (M.C.N.)
| | - Federico Battistoni
- Biological Research Institute Clemente Estable, Microbial Biochemistry and Genomics Department, Avenida Italia 3318, Montevideo 11600, Uruguay; (C.T.); (F.B.); (E.F.)
| | - Elena Fabiano
- Biological Research Institute Clemente Estable, Microbial Biochemistry and Genomics Department, Avenida Italia 3318, Montevideo 11600, Uruguay; (C.T.); (F.B.); (E.F.)
| | - Angela Villanueva-Guerrero
- Laboratorio de Silvicultura, Departamento de Ciencias Forestales, Facultad de Ciencias Agropecuarias y Medioambiente, Universidad de La Frontera, Temuco 4811230, Chile;
- Programa de Magister en Manejo de Recursos Naturales, Facultad de Ciencias Agropecuarias y Medioambiente, Universidad de La Frontera, Temuco 4811230, Chile
| | - María Caridad Nápoles
- National Institute of Agricultural Science, Plant Physiology and Biochemistry Department, Carretera a Tapaste Km 3 y ½, San José de las Lajas 32700, Mayabeque, Cuba; (R.P.-P.); (M.C.N.)
| | - Héctor Herrera
- Laboratorio de Silvicultura, Departamento de Ciencias Forestales, Facultad de Ciencias Agropecuarias y Medioambiente, Universidad de La Frontera, Temuco 4811230, Chile;
- Laboratorio de Ecosistemas y Bosques, Departamento de Ciencias Forestales, Facultad de Ciencias Agropecuarias y Medioambiente, Universidad de La Frontera, Temuco 4811230, Chile
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19
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Wallace JG. Maize seed endophytes. MOLECULAR PLANT PATHOLOGY 2023; 24:801-810. [PMID: 36416063 DOI: 10.1111/mpp.13278] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/29/2022] [Accepted: 10/20/2022] [Indexed: 06/11/2023]
Abstract
Maize is a vital global crop, and each seed (kernel) hosts an ecosystem of microbes living inside it. However, we know very little about these endophytes and what their role is in plant production and physiology. In this Microreview, I summarize the major questions around maize seed endophytes, including what organisms are present, how they get there, whether and how they transmit across generations, and how they and the plant affect each other. Although several studies touch on each of these areas, ultimately there are far more questions than answers. Future priorities for research on maize seed endophytes should include understanding what adaptations allow microbes to be seed endophytes, how the host genetics and the environment affect these communities, and how maize seed endophytes ultimately contribute to the next generation of plants.
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Affiliation(s)
- Jason G Wallace
- Department of Crop & Soil Science, University of Georgia, Athens, Georgia, USA
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20
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Philpott M, Liew ECY, van der Merwe MM, Mertin A, French K. The Influence of Cone Age and Urbanisation on the Diversity and Community Composition of Culturable Seed Fungal Endophytes within Native Australian Banksia ericifolia L.f. subsp. ericifolia. J Fungi (Basel) 2023; 9:706. [PMID: 37504695 PMCID: PMC10381327 DOI: 10.3390/jof9070706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 06/25/2023] [Accepted: 06/26/2023] [Indexed: 07/29/2023] Open
Abstract
Seed fungal endophytes play a crucial role in assisting the overall health and success of their host plant; however, little is known about the factors that influence the diversity and composition of these endophytes, particularly with respect to how they change over time and within urban environments. Using culturing techniques, morphological analyses, and Sanger sequencing, we identified the culturable seed fungal endophytes of Banksia ericifolia at two urban and two natural sites in Sydney, New South Wales, Australia. A total of 27 Operational Taxonomic Units were obtained from 1200 seeds. Older cones were found to contain, on average, more colonised endophytes than younger cones. Species richness was also significantly influenced by cone age, with older cones being more speciose. Between urban and natural sites, the overall community composition did not change, although species richness and diversity were greatest at urban sites. Understanding how these endophytes vary in time and space may help provide an insight into the transmission pathways used and the potential role they play within the development and survival of the seed. This knowledge may also be crucial for restoration purposes, especially regarding the need to consider endophyte viability in ex situ seed collection and storage in seed-banking practices.
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Affiliation(s)
- Merize Philpott
- Centre for Sustainable Ecosystems Solutions, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Edward C Y Liew
- Research Centre for Ecosystem Resilience, The Royal Botanic Gardens and Domain Trust, Mrs Macquaries Rd, Sydney, NSW 2000, Australia
| | - Marlien M van der Merwe
- Research Centre for Ecosystem Resilience, The Royal Botanic Gardens and Domain Trust, Mrs Macquaries Rd, Sydney, NSW 2000, Australia
| | - Allison Mertin
- Research Centre for Ecosystem Resilience, The Royal Botanic Gardens and Domain Trust, Mrs Macquaries Rd, Sydney, NSW 2000, Australia
| | - Kristine French
- Centre for Sustainable Ecosystems Solutions, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
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21
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Górzyńska K, Olejniczak P, Węgrzyn E. The fungus Clonostachys epichloë alters the influence of the Epichloë endophyte on seed germination and the biomass of Puccinellia distans grass. Front Microbiol 2023; 14:1146061. [PMID: 37434716 PMCID: PMC10330949 DOI: 10.3389/fmicb.2023.1146061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 06/08/2023] [Indexed: 07/13/2023] Open
Abstract
The fungal grass endophyte Epichloë typhina (Pers.) Tul. & C. Tul. (Ascomycota: Clavicipitaceae) grows intercellulary in aerial plant parts and reproduces asexually by invading host seeds. In this phase, it enhances seed production and germination, which accelerates its vertical spread. This relationship may be distorted by other seed-born fungi, whose spread is not so directly dependent on the success of the grass. Recently, the fungus Clonostachys epichloë Schroers has been observed on Puccinellia distans (Jacq.) Parl seeds originating from grass clumps infested with stromata, sexual structures of Epichloë typhina that are formed in spring on some host culms, preventing flower and seed development ('choke disease'). C. epichloë shows mycoparasitic activity toward Epichloë stromata by reducing the production of ascospores, which are responsible for horizontal transmission of the fungus. The aim of this study was to investigate the effect of seed-borne C. epichloë on seed germination, as well as the size and weight of P. distans seedlings and to examine whether C. epichloë alters the influence of Epichloë in the early developmental stages of P. distans. The results showed that if C. epichloë acts on seeds together with E. typhina endophytes, the seeds were negatively affected due to the elimination of the positive effect of the latter in terms of both seed germination rate and seedling length. At the same time, C. epichloë increased the proportion of E. typhina-untreated germinated seeds. Additionally, only the joint action of the two fungi, E. typhina and C. epichloë, effectively stimulated seedling dry mass; the presence of E. typhina alone was not sufficient to noticeably affect seedling size. Based on the increasing commonality of C. epichloë on Epichloë stromata, as well as its potential to be used in biocontrol of 'choke disease', we should take a closer look at this fungus, not only in terms of its mycoparasitic ability, but also in terms of its cumulative impact on the whole Epichloë-grass system.
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Affiliation(s)
- Karolina Górzyńska
- Department of Systematic and Environmental Botany, Adam Mickiewicz University, Poznań, Poland
| | - Paweł Olejniczak
- Institute of Nature Conservation, Polish Academy of Sciences, Kraków, Poland
| | - Ewa Węgrzyn
- Department of Systematic and Environmental Botany, Adam Mickiewicz University, Poznań, Poland
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22
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Newcombe G, Marlin M, Barge E, Heitmann S, Ridout M, Busby PE. Plant Seeds Commonly Host Bacillus spp., Potential Antagonists of Phytopathogens. MICROBIAL ECOLOGY 2023; 85:1356-1366. [PMID: 35552795 DOI: 10.1007/s00248-022-02024-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 04/25/2022] [Indexed: 05/10/2023]
Abstract
In agriculture, horticulture and plantation forestry, Bacillus species are the most commonly applied antagonists and biopesticides, targeting plant pathogens and insect pests, respectively. Bacillus isolates are also used as bacterial plant biostimulants, or BPBs. Such useful isolates of Bacillus are typically sourced from soil. Here, we show that Bacillus - and other antagonistic microbes - can be sourced from a broad range of plant seeds. We found that culturable Bacillus isolates are common in the seeds of 98 plant species representing 39 families (i.e., 87% of the commonly cultured bacteria belonged to Bacillales). We also found that 83% of the commonly cultured fungi from the seeds of the 98 plant species belonged to just three orders of fungi-Pleosporales, Hypocreales and Eurotiales-that are also associated with antagonism. Furthermore, we confirmed antagonism potential in agaro with seed isolates of Bacillus from Pinus monticola as a representative case. Eight isolates each of seed Bacillus, seed fungi, and foliar fungi, all from P. monticola, were paired in a total of 384 possible pair-wise interactions (with seed and foliar fungi as the targets). Seed Bacillus spp. were the strongest antagonists of the seed and foliar fungi, with a mean interaction strength 2.8 times greater than seed fungi (all either Eurotiales or Hypocreales) and 3.2 times greater than needle fungi. Overall, our study demonstrates that seeds host a taxonomically narrow group of culturable, antagonistic bacteria and fungi.
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Affiliation(s)
- George Newcombe
- Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, ID, 83844-1133, USA
| | - Maria Marlin
- Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, ID, 83844-1133, USA
| | - Edward Barge
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, 97331, USA
| | - Sabrina Heitmann
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, 97331, USA
| | - Mary Ridout
- University of Idaho Extension Washington County, College of Agriculture and Life Sciences, Weiser, ID, 83672, USA
| | - Posy E Busby
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, 97331, USA.
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23
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Jalal A, Oliveira CEDS, Rosa PAL, Galindo FS, Teixeira Filho MCM. Beneficial Microorganisms Improve Agricultural Sustainability under Climatic Extremes. Life (Basel) 2023; 13:life13051102. [PMID: 37240747 DOI: 10.3390/life13051102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Revised: 04/08/2023] [Accepted: 04/24/2023] [Indexed: 05/28/2023] Open
Abstract
The challenging alterations in climate in the last decades have had direct and indirect influences on biotic and abiotic stresses that have led to devastating implications on agricultural crop production and food security. Extreme environmental conditions, such as abiotic stresses, offer great opportunities to study the influence of different microorganisms in plant development and agricultural productivity. The focus of this review is to highlight the mechanisms of plant growth-promoting microorganisms (especially bacteria and fungi) adapted to environmental induced stresses such as drought, salinity, heavy metals, flooding, extreme temperatures, and intense light. The present state of knowledge focuses on the potential, prospective, and biotechnological approaches of plant growth-promoting bacteria and fungi to improve plant nutrition, physio-biochemical attributes, and the fitness of plants under environmental stresses. The current review focuses on the importance of the microbial community in improving sustainable crop production under changing climatic scenarios.
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Affiliation(s)
- Arshad Jalal
- Department of Plant Health, Rural Engineering and Soils, Faculty of Engineering, São Paulo State University (UNESP), Av. Brasil 56-Centro, Ilha Solteira 15385-000, SP, Brazil
| | - Carlos Eduardo da Silva Oliveira
- Department of Plant Health, Rural Engineering and Soils, Faculty of Engineering, São Paulo State University (UNESP), Av. Brasil 56-Centro, Ilha Solteira 15385-000, SP, Brazil
| | - Poliana Aparecida Leonel Rosa
- Department of Plant Health, Rural Engineering and Soils, Faculty of Engineering, São Paulo State University (UNESP), Av. Brasil 56-Centro, Ilha Solteira 15385-000, SP, Brazil
| | - Fernando Shintate Galindo
- Faculty of Agricultural Sciences and Technology, São Paulo State University (UNESP), Campus of Dracena, Sao Paulo 17900-000, SP, Brazil
| | - Marcelo Carvalho Minhoto Teixeira Filho
- Department of Plant Health, Rural Engineering and Soils, Faculty of Engineering, São Paulo State University (UNESP), Av. Brasil 56-Centro, Ilha Solteira 15385-000, SP, Brazil
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24
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War AF, Bashir I, Reshi ZA, Kardol P, Rashid I. Insights into the seed microbiome and its ecological significance in plant life. Microbiol Res 2023; 269:127318. [PMID: 36753851 DOI: 10.1016/j.micres.2023.127318] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 12/12/2022] [Accepted: 02/01/2023] [Indexed: 02/05/2023]
Abstract
In recent years, the microbiome has attracted much attention because of the multiple roles and functions that microbes play in plants, animals, and human beings. Seed-associated microbes are of particular interest in being the initial microbial inoculum that affects the critical early life stages of a plant. The seed-microbe interactions are also known to improve nutrient acquisition, resilience against pathogens, and resistance against abiotic stresses. Despite these diverse roles, the seed microbiome has received little attention in plant ecology. Thus, we review the current knowledge on seed microbial diversity, community structure, and functions obtained through culture-dependent and culture-independent approaches. Furthermore, we present a comprehensive synthesis of the ecological literature on seed-microbe interactions to better understand the impact of these interactions on plant health and productivity. We suggest that future research should focus on the role of the seed microbiome in the establishment, colonization and spread of plant species in their native and non-native ranges as it may provide new insights into conservation biology and invasion ecology.
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Affiliation(s)
- Aadil Farooq War
- Department of Botany, University of Kashmir, Srinagar 190006, Jammu and Kashmir, India.
| | - Iqra Bashir
- Department of Botany, University of Kashmir, Srinagar 190006, Jammu and Kashmir, India
| | - Zafar A Reshi
- Department of Botany, University of Kashmir, Srinagar 190006, Jammu and Kashmir, India
| | - Paul Kardol
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, S 901 83 Umeå, Sweden
| | - Irfan Rashid
- Department of Botany, University of Kashmir, Srinagar 190006, Jammu and Kashmir, India
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25
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Abdelfattah A, Tack AJM, Lobato C, Wassermann B, Berg G. From seed to seed: the role of microbial inheritance in the assembly of the plant microbiome. Trends Microbiol 2023; 31:346-355. [PMID: 36481186 DOI: 10.1016/j.tim.2022.10.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 10/21/2022] [Accepted: 10/21/2022] [Indexed: 12/10/2022]
Abstract
Despite evidence that the microbiome extends host genetic and phenotypic traits, information on how the microbiome is transmitted and maintained across generations remains fragmented. For seed-bearing plants, seeds harbor a distinct microbiome and play a unique role by linking one generation to the next. Studies on microbial inheritance, a process we suggest including both vertical transmission and the subsequent migration of seed microorganisms to the new plant, thus become essential for our understanding of host evolutionary potential and host-microbiome coevolution. We propose dividing the inheritance process into three stages: (i) plant to seed, (ii) seed dormancy, and (iii) seed to seedling. We discuss the factors affecting the assembly of the microbiome during the three stages, highlight future research directions, and emphasize the implications of microbial inheritance for fundamental science and society.
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Affiliation(s)
- Ahmed Abdelfattah
- Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Max-Eyth Allee 100, 14469 Potsdam, Germany; Department of Ecology, Environment and Plant Sciences, Stockholm University, Svante Arrhenius väg 20A, Stockholm, SE-106 91, Sweden; Institute of Environmental Biotechnology, Graz University of Technology, Petersgasse 12, Graz 8010, Austria.
| | - Ayco J M Tack
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Svante Arrhenius väg 20A, Stockholm, SE-106 91, Sweden
| | - Carolina Lobato
- Institute of Environmental Biotechnology, Graz University of Technology, Petersgasse 12, Graz 8010, Austria
| | - Birgit Wassermann
- Institute of Environmental Biotechnology, Graz University of Technology, Petersgasse 12, Graz 8010, Austria
| | - Gabriele Berg
- Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Max-Eyth Allee 100, 14469 Potsdam, Germany; Institute of Environmental Biotechnology, Graz University of Technology, Petersgasse 12, Graz 8010, Austria; Institute for Biochemistry and Biology, University of Potsdam, 14476 Potsdam OT Golm, Germany
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26
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Ren Z, Chen AJ, Zong Q, Du Z, Guo Q, Liu T, Chen W, Gao L. Microbiome Signature of Endophytes in Wheat Seed Response to Wheat Dwarf Bunt Caused by Tilletia controversa Kühn. Microbiol Spectr 2023; 11:e0039022. [PMID: 36625645 PMCID: PMC9927297 DOI: 10.1128/spectrum.00390-22] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 11/20/2022] [Indexed: 01/11/2023] Open
Abstract
Wheat dwarf bunt leads to the replacement of seeds with fungal galls containing millions of teliospores of the pathogen Tilletia controversa Kühn. As one of the most devastating internationally quarantined wheat diseases, wheat dwarf bunt spreads to cause distant outbreaks by seeds containing teliospores. In this study, based on a combination of amplicon sequencing and isolation approaches, we analyzed the seed microbiome signatures of endophytes between resistant and susceptible cultivars after infection with T. controversa. Among 310 bacterial species obtained only by amplicon sequencing and 51 species obtained only by isolation, we found 14 overlapping species by both methods; we detected 128 fungal species only by amplicon sequencing, 56 only by isolation, and 5 species by both methods. The results indicated that resistant uninfected cultivars hosted endophytic communities that were much more stable and beneficial to plant health than those in susceptible infected cultivars. The susceptible group showed higher diversity than the resistant group, the infected group showed more diversity than the uninfected group, and the microbial communities in seeds were related to infection or resistance to the pathogen. Some antagonistic microbes significantly suppressed the germination rate of the pathogen's teliospores, providing clues for future studies aimed at developing strategies against wheat dwarf bunt. Collectively, this research advances the understanding of the microbial assembly of wheat seeds upon exposure to fungal pathogen (T. controversa) infection. IMPORTANCE This is the first study on the microbiome signature of endophytes in wheat seed response to wheat dwarf bunt caused by Tilletia controversa Kühn. Some antagonistic microbes suppressed the germination of teliospores of the pathogen significantly, which will provide clues for future studies against wheat dwarf bunt. Collectively, this research first advances the understanding of the microbial assembly of wheat seed upon exposure to the fungal pathogen (T. controversa) infection.
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Affiliation(s)
- Zhaoyu Ren
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
| | - Amanda Juan Chen
- Microbiome Research Center, Moon (Guangzhou) Biotech Ltd., Guangzhou, People’s Republic of China
| | - Qianqian Zong
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
- Xinjiang Agricultural University, Urumqi, Xinjiang, People’s Republic of China
| | - Zhenzhen Du
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
| | - Qingyuan Guo
- Xinjiang Agricultural University, Urumqi, Xinjiang, People’s Republic of China
| | - Taiguo Liu
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
| | - Wanquan Chen
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
| | - Li Gao
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, People’s Republic of China
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Surovy MZ, Islam T, von Tiedemann A. Role of seed infection for the near and far distance dissemination of wheat blast caused by Magnaporthe oryzae pathotype Triticum. Front Microbiol 2023; 14:1040605. [PMID: 36819053 PMCID: PMC9929367 DOI: 10.3389/fmicb.2023.1040605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Accepted: 01/09/2023] [Indexed: 02/04/2023] Open
Abstract
Magnaporthe oryzae pathotype Triticum (MoT) is a devastating fungal phytopathogen causing wheat blast disease which threatens wheat production particularly in warmer climate zones. Effective disease control is hampered by the limited knowledge on the life cycle, epidemiology, and pathogenicity of MoT. Since MoT mainly infects and colonizes the inflorescences of wheat, infection, invasion routes and colonization of MoT on wheat ears and in wheat seeds were investigated in order to assess potential seed transmission pathways. MoT was spray inoculated on two wheat cultivars (Sumai 3, susceptible and Milan, resistant) at three ear maturity stages [full ear emergence, growth stage (GS) 59; mid flowering, GS 65; and end of flowering, GS 69]. Incidence of MoT on Sumai 3 seeds was 100% and 20-25% on Milan. MoT sporulation rate on Sumai 3 contaminated seeds was more than 15 times higher than on Milan. Repeated washes of seed samples for removing paraffin fixation hampers seed microscopy. To overcome the damage of seed samples, we used hand-sectioned seed samples instead of paraffin-fixed microtome samples to facilitate microscopy. The colonization of MoT within various seed tissues was followed by light and confocal laser scanning microscopy (CLSM). Invasion of MoT in seeds predominantly occurred in the caryopsis germ region, but entry via other seed parts was also observed, confirming the potential of intense colonization of MoT in wheat grains. Fungal spread in wheat plants growing from MoT infected seeds was monitored through plating, microscopic and molecular techniques. Under greenhouse conditions, no spread of MoT from infected seeds to seedlings later than GS 21 or to ears was detected, neither in Milan nor in Sumai 3. We therefore conclude, that MoT may not systemically contaminate inflorescences and seeds in neither susceptible nor resistant wheat cultivars. However, initial blast symptoms, only found on seedlings of Sumai 3 but not Milan, resulted in the formation of new conidia, which may serve as inoculum source for plant-to-plant dissemination by airborne infection of plant stands in the field (short distance spread). Ultimately the inoculum may infect young inflorescences in the field and contaminate seeds. Our findings again stress the risk of long-distance dissemination of wheat blast across continents through MoT-contaminated seeds. This underlines the importance of mandatory use of healthy seeds in strategies to control any further spread of wheat blast.
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Affiliation(s)
- Musrat Zahan Surovy
- Division of Plant Pathology and Crop Protection, Department of Crop Sciences, Georg-August-Universität Göttingen, Göttingen, Germany,Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh,*Correspondence: Musrat Zahan Surovy, ✉
| | - Tofazzal Islam
- Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
| | - Andreas von Tiedemann
- Division of Plant Pathology and Crop Protection, Department of Crop Sciences, Georg-August-Universität Göttingen, Göttingen, Germany,Andreas von Tiedemann, ✉
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28
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Azar N, Liarzi O, Zavitan M, Samara M, Nasser A, Ezra D. Endophytic Penicillium species secretes mycophenolic acid that inhibits the growth of phytopathogenic fungi. Microb Biotechnol 2023. [PMID: 36700385 PMCID: PMC10364310 DOI: 10.1111/1751-7915.14203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 11/28/2022] [Accepted: 12/13/2022] [Indexed: 01/27/2023] Open
Abstract
The worldwide demand for reduced and restricted use of pesticides in agriculture due to serious environmental effects, health risks and the development of pathogen resistance calls for the discovery of new bioactive compounds. In the medical field, antibiotic-resistant microorganisms have become a major threat to man, increasing mortality. Endophytes are endosymbiotic microorganisms that inhabit plant tissues without causing any visible damage to their host. Many endophytes secrete secondary metabolites with biological activity against a broad range of pathogens, making them potential candidates for novel drugs and alternative pesticides of natural origin. We isolated endophytes from wild plants in Israel, focusing on endophytes that secrete secondary metabolites with biological activity. We isolated 302 different endophytes from 30 different wild plants; 70 of them exhibited biological activity against phytopathogens. One biologically active fungal endophyte from the genus Penicillium, isolated from a squill (Urginea maritima) leaf, was further examined. Chloroform-based extraction of its growth medium was similarly active against phytopathogens. High-performance liquid chromatography separation followed by gas chromatography/mass spectrometry analysis revealed a single compound-mycophenolic acid-as the main contributor to the biological activity of the organic extract.
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Affiliation(s)
- Neri Azar
- Department of Plant Pathology and Weed Research, ARO - the Volcani Center, Rishon LeZion, Israel
| | - Orna Liarzi
- Department of Plant Pathology and Weed Research, ARO - the Volcani Center, Rishon LeZion, Israel
| | - Maor Zavitan
- Department of Plant Pathology and Weed Research, ARO - the Volcani Center, Rishon LeZion, Israel
| | - Mohamed Samara
- Institute of Soils, Water and Environmental Sciences, ARO - the Volcani Center, Rishon LeZion, Israel
| | - Ahmed Nasser
- Institute of Soils, Water and Environmental Sciences, ARO - the Volcani Center, Rishon LeZion, Israel
| | - David Ezra
- Department of Plant Pathology and Weed Research, ARO - the Volcani Center, Rishon LeZion, Israel
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Seeds of Stevia rebaudiana Bertoni as a Source of Plant Growth-Promoting Endophytic Bacteria with the Potential to Synthesize Rebaudioside A. Int J Mol Sci 2023; 24:ijms24032174. [PMID: 36768498 PMCID: PMC9917351 DOI: 10.3390/ijms24032174] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/12/2023] [Accepted: 01/18/2023] [Indexed: 01/25/2023] Open
Abstract
In this study, a new strain of Pantoea vagans, SRS89, was isolated from surface-sterilized stevia seeds. The isolate was evaluated using morphological, molecular, and biochemical methods. The bacterium was 1.5 μm long, yellowish in color, and classified as Gram-negative. Whole genome sequencing of our strain revealed the presence of a 4,610,019 bp chromosome, and genome annotation resulted in the detection of 4283 genes encoding 4204 putative coding sequences. Phylogenic analysis classified the genome of our strain close to the MP7 and LMG 24199 strains of P. vagans. Functional analysis showed that the highest number of genes within the analyzed bacterium genome were involved in transcription, amino acid transport and metabolism, and carbohydrate transport and metabolism. We also identified genes for enzymes involved in the biosynthesis of carotenoids and terpenoids. Furthermore, we showed the presence of growth regulators, with the highest amount noted for gibberellic acid A3, indole-3-acetic acid, and benzoic acid. However, the most promising property of this strain is its ability to synthesize rebaudioside A; the estimated amount quantified using reversed-phase (RP)-HPLC was 4.39 mg/g of the dry weight of the bacteria culture. The isolated endophytic bacterium may be an interesting new approach to the production of this valuable metabolite.
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Wolfgang A, Temme N, Tilcher R, Berg G. Understanding the sugar beet holobiont for sustainable agriculture. Front Microbiol 2023; 14:1151052. [PMID: 37138624 PMCID: PMC10149816 DOI: 10.3389/fmicb.2023.1151052] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 03/31/2023] [Indexed: 05/05/2023] Open
Abstract
The importance of crop-associated microbiomes for the health and field performance of plants has been demonstrated in the last decades. Sugar beet is the most important source of sucrose in temperate climates, and-as a root crop-yield heavily depends on genetics as well as on the soil and rhizosphere microbiomes. Bacteria, fungi, and archaea are found in all organs and life stages of the plant, and research on sugar beet microbiomes contributed to our understanding of the plant microbiome in general, especially of microbiome-based control strategies against phytopathogens. Attempts to make sugar beet cultivation more sustainable are increasing, raising the interest in biocontrol of plant pathogens and pests, biofertilization and -stimulation as well as microbiome-assisted breeding. This review first summarizes already achieved results on sugar beet-associated microbiomes and their unique traits, correlating to their physical, chemical, and biological peculiarities. Temporal and spatial microbiome dynamics during sugar beet ontogenesis are discussed, emphasizing the rhizosphere formation and highlighting knowledge gaps. Secondly, potential or already tested biocontrol agents and application strategies are discussed, providing an overview of how microbiome-based sugar beet farming could be performed in the future. Thus, this review is intended as a reference and baseline for further sugar beet-microbiome research, aiming to promote investigations in rhizosphere modulation-based biocontrol options.
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Affiliation(s)
- Adrian Wolfgang
- Institute of Environmental Biotechnology, Graz University of Technology, Graz, Austria
| | - Nora Temme
- KWS SAAT SE & Co. KGaA, Einbeck, Germany
| | | | - Gabriele Berg
- Institute of Environmental Biotechnology, Graz University of Technology, Graz, Austria
- Microbiome Biotechnology Department, Leibniz-Institute for Agricultural Engineering and Bioeconomy (ATB), Potsdam, Germany
- Institute for Biochemistry and Biology, University of Potsdam, Potsdam, Germany
- *Correspondence: Gabriele Berg
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31
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Niza-Costa M, Rodríguez-dos Santos AS, Rebelo-Romão I, Ferrer MV, Sequero López C, Vílchez JI. Geographically Disperse, Culturable Seed-Associated Microbiota in Forage Plants of Alfalfa ( Medicago sativa L.) and Pitch Clover ( Bituminaria bituminosa L.): Characterization of Beneficial Inherited Strains as Plant Stress-Tolerance Enhancers. BIOLOGY 2022; 11:biology11121838. [PMID: 36552347 PMCID: PMC9775229 DOI: 10.3390/biology11121838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 12/13/2022] [Accepted: 12/13/2022] [Indexed: 12/24/2022]
Abstract
Agricultural production is being affected by increasingly harsh conditions caused by climate change. The vast majority of crops suffer growth and yield declines due to a lack of water or intense heat. Hence, commercial legume crops suffer intense losses of production (20-80%). This situation is even more noticeable in plants used as fodder for animals, such as alfalfa and pitch trefoil, since their productivity is linked not only to the number of seeds produced, but also to the vegetative growth of the plant itself. Thus, we decided to study the microbiota associated with their seeds in different locations on the Iberian Peninsula, with the aim of identifying culturable bacteria strains that have adapted to harsh environments and that can be used as biotreatments to improve plant growth and resistance to stress. As potentially inherited microbiota, they may also represent a treatment with medium- and long-term adaptative effects. Hence, isolated strains showed no clear relationship with their geographical sampling location, but had about 50% internal similarity with their model plants. Moreover, out of the 51 strains isolated, about 80% were capable of producing biofilms; around 50% produced mid/high concentrations of auxins and grew notably in ACC medium; only 15% were characterized as xerotolerant, while more than 75% were able to sporulate; and finally, 65% produced siderophores and more than 40% produced compounds to solubilize phosphates. Thus, Paenibacillus amylolyticus BB B2-A, Paenibacillus xylanexedens MS M1-C, Paenibacillus pabuli BB Oeiras A, Stenotrophomonas maltophilia MS M1-B and Enterobacter hormaechei BB B2-C strains were tested as plant bioinoculants in lentil plants (Lens culinaris Medik.), showing promising results as future treatments to improve plant growth under stressful conditions.
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Affiliation(s)
- Marla Niza-Costa
- iPlantMicro Lab, Instituto de Tecnologia Química e Biológica (ITQB)-NOVA, Oeiras, 2784-501 Lisboa, Portugal
| | | | - Inês Rebelo-Romão
- iPlantMicro Lab, Instituto de Tecnologia Química e Biológica (ITQB)-NOVA, Oeiras, 2784-501 Lisboa, Portugal
| | - María Victoria Ferrer
- iPlantMicro Lab, Instituto de Tecnologia Química e Biológica (ITQB)-NOVA, Oeiras, 2784-501 Lisboa, Portugal
| | - Cristina Sequero López
- GeoBioTec, Department of Earth Sciences, NOVA School of Sciences and Technology, Universidade NOVA de Lisboa (Campus de Caparica), 1070-312 Caparica, Portugal
| | - Juan Ignacio Vílchez
- iPlantMicro Lab, Instituto de Tecnologia Química e Biológica (ITQB)-NOVA, Oeiras, 2784-501 Lisboa, Portugal
- Correspondence:
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Ryabova OV, Gagarina AA. Actinomycetes as the Basis of Probiotics for Plants. APPL BIOCHEM MICRO+ 2022. [DOI: 10.1134/s0003683822070055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Lin Q, Xu Z, Li M, Wang Y, Li L. Spatial differences in Casuarina equisetifolia L. endophyte community structure. ANN MICROBIOL 2022. [DOI: 10.1186/s13213-022-01685-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Purpose
Casuarina equisetifolia, a fast-growing, abundant tree species on the southeastern coast of China, plays an important role in protecting the coastal environment, but the ecological processes that govern microbiome assembly and within-plant microorganism transmission are poorly known.
Methods
In this paper, we used ITS and 16S amplification techniques to study the diversity of fungal and bacterial endophytes in critical plant parts of this species: seeds, branchlets, and roots. Additionally, we examined the litter of this species to understand the process of branchlets from birth to litter.
Result
We uncovered a non-random distribution of endophyte diversity in which branchlets had the greatest and seeds had the lowest endophytic fungal diversity. In contrast, litter endophytic bacteria had the highest diversity, and branchlets had the lowest diversity. As for fungi, a large part of the seed microbiome was transmitted to the phyllosphere, while a large part of the bacterial microbiome in the seed was transmitted to the root.
Conclusion
Our study provides comprehensive evidence on diversity, potential sources, and transmission pathways for non-crop microbiome assembly and has implications for the management and manipulation of the non-crop microbiome in the future.
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Mertin AA, Laurence MH, van der Merwe M, French K, Liew ECY. The culturable seed mycobiome of two Banksia species is dominated by latent saprotrophic and multi-trophic fungi. Fungal Biol 2022; 126:738-745. [PMID: 36517141 DOI: 10.1016/j.funbio.2022.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 08/07/2022] [Accepted: 09/12/2022] [Indexed: 01/07/2023]
Abstract
Seed fungal endophytes play an important beneficial role in the formation of the seedling mycobiome and contribute to plant establishment, but can also occur as latent pathogens and saprotrophs. Current knowledge on the function and diversity of seed fungal endophytes has been gained through studies in agricultural systems whilst knowledge from natural systems is relatively less. We used two co-occurring species from the genus Banksia from four sites in Australia's Sydney Basin Bioregion to investigate the abundance and diversity of seed fungal endophyte communities present in natural ecosystem hosts. Based on results from culturing and DNA sequence analysis of multiple loci, we found that Banksia seeds house a diverse range of fungal endophyte species, that when assigned to functional guilds belonged to multiple trophic modes. Thirty-one of the fungal taxa identified had not been previously reported as endophytes. Amongst the 58 Operational Taxonomic Units identified, Leotiomycetes and Sordariomycetes were the dominant classes and Banksiamyces (Leotiomycetes) and Penicillium (Sordariomycetes) the dominant genera, with many of the species isolated recorded in the literature as having a limited distribution. The two Banksias shared few fungal endophyte species, which were not always present across all study sites. We revealed a 'hidden diversity' within seeds of Banksia from natural ecosystems and provided insights into the influence host species can have on the seed mycobiome.
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Affiliation(s)
- A A Mertin
- Research Centre for Ecosystem Resilience, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Mrs Macquaries Rd, Sydney, NSW, 2000, Australia.
| | - M H Laurence
- PlantClinic, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Mrs Macquaries Rd, Sydney, NSW, 2000, Australia.
| | - M van der Merwe
- Research Centre for Ecosystem Resilience, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Mrs Macquaries Rd, Sydney, NSW, 2000, Australia.
| | - K French
- Centre for Sustainable Ecosystem Solutions, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW, 2522, Australia.
| | - E C Y Liew
- Research Centre for Ecosystem Resilience, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Mrs Macquaries Rd, Sydney, NSW, 2000, Australia.
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Chaudhary P, Agri U, Chaudhary A, Kumar A, Kumar G. Endophytes and their potential in biotic stress management and crop production. Front Microbiol 2022; 13:933017. [PMID: 36325026 PMCID: PMC9618965 DOI: 10.3389/fmicb.2022.933017] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Accepted: 09/12/2022] [Indexed: 11/21/2022] Open
Abstract
Biotic stress is caused by harmful microbes that prevent plants from growing normally and also having numerous negative effects on agriculture crops globally. Many biotic factors such as bacteria, fungi, virus, weeds, insects, and nematodes are the major constrains of stress that tends to increase the reactive oxygen species that affect the physiological and molecular functioning of plants and also led to the decrease in crop productivity. Bacterial and fungal endophytes are the solution to overcome the tasks faced with conventional farming, and these are environment friendly microbial commodities that colonize in plant tissues without causing any damage. Endophytes play an important role in host fitness, uptake of nutrients, synthesis of phytohormone and diminish the injury triggered by pathogens via antibiosis, production of lytic enzymes, secondary metabolites, and hormone activation. They are also reported to help plants in coping with biotic stress, improving crops and soil health, respectively. Therefore, usage of endophytes as biofertilizers and biocontrol agent have developed an eco-friendly substitute to destructive chemicals for plant development and also in mitigation of biotic stress. Thus, this review highlighted the potential role of endophytes as biofertilizers, biocontrol agent, and in mitigation of biotic stress for maintenance of plant development and soil health for sustainable agriculture.
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Affiliation(s)
- Parul Chaudhary
- Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | - Upasana Agri
- Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | | | - Ashish Kumar
- Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | - Govind Kumar
- Indian Council of Agricultural Research (ICAR)-Central Institute for Subtropical Horticulture, Lucknow, India
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Lastochkina O, Aliniaeifard S, SeifiKalhor M, Bosacchi M, Maslennikova D, Lubyanova A. Novel Approaches for Sustainable Horticultural Crop Production: Advances and Prospects. HORTICULTURAE 2022; 8:910. [DOI: 10.3390/horticulturae8100910] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/23/2023]
Abstract
Reduction of plant growth, yield and quality due to diverse environmental constrains along with climate change significantly limit the sustainable production of horticultural crops. In this review, we highlight the prospective impacts that are positive challenges for the application of beneficial microbial endophytes, nanomaterials (NMs), exogenous phytohormones strigolactones (SLs) and new breeding techniques (CRISPR), as well as controlled environment horticulture (CEH) using artificial light in sustainable production of horticultural crops. The benefits of such applications are often evaluated by measuring their impact on the metabolic, morphological and biochemical parameters of a variety of cultures, which typically results in higher yields with efficient use of resources when applied in greenhouse or field conditions. Endophytic microbes that promote plant growth play a key role in the adapting of plants to habitat, thereby improving their yield and prolonging their protection from biotic and abiotic stresses. Focusing on quality control, we considered the effects of the applications of microbial endophytes, a novel class of phytohormones SLs, as well as NMs and CEH using artificial light on horticultural commodities. In addition, the genomic editing of plants using CRISPR, including its role in modulating gene expression/transcription factors in improving crop production and tolerance, was also reviewed.
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Yang M, Qi Y, Liu J, Wu Z, Gao P, Chen Z, Huang F, Yu L. Dynamic changes in the endophytic bacterial community during maturation of Amorphophallus muelleri seeds. Front Microbiol 2022; 13:996854. [PMID: 36225382 PMCID: PMC9549114 DOI: 10.3389/fmicb.2022.996854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 09/08/2022] [Indexed: 11/17/2022] Open
Abstract
The seed microbiota is considered to be the starting point of the accumulation of plant microbiota, which is conducive to the preservation and germination of seeds and the establishment and development of seedlings. Our understanding of the colonization and migration dynamics of microbial taxa during seed development and maturation is still limited. This study used 16S rRNA high-throughput sequencing to investigate the dynamic changes in the composition and diversity of the endophytic bacterial community during maturation of Amorphophallus muelleri seeds. The results showed that as seeds matured (green to red), the Shannon index of their endophytic bacterial community first decreased and then increased, and the ACE and Chao1 indices of the endophytic bacterial community decreased gradually. The Shannon, ACE, and Chao1 indices of the endophytic bacterial community in the seed coat first decreased and then increased. Principal coordinate analysis of the bacterial communities revealed that the seed coat at different maturity stages showed significantly distinct bacterial communities and formed different clusters according to maturity stage. The bacterial communities of green and red seeds showed a clear separation, but they both overlapped with those of yellow seeds, indicating that some core taxa were present throughout seed maturation, but their relative abundance was dynamically changing. As the seeds grew more mature, the relative abundance of some bacterial communities with plant growth-promoting traits and others correlated with plant resistance (e.g., Burkholderia-Caballeronia-Paraburkholderia, Bacillus, Pseudomonas, Bradyrhizobium, Streptomyces) tended to increase and peaked in fully mature seeds and seed coats. The endophytic bacterial community of A. muelleri seeds seems to be driven by the seed maturation state, which can provide a theoretical basis for a comprehensive understanding of the assembly process of the microbial community during A. muelleri seed maturation.
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Affiliation(s)
- Min Yang
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
- College of Plant Protection, Yunnan Agricultural University, Kunming, China
| | - Ying Qi
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
| | - Jiani Liu
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
| | - Zhixing Wu
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
| | - Penghua Gao
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
| | - Zebin Chen
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
| | - Feiyan Huang
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
- *Correspondence: Feiyan Huang,
| | - Lei Yu
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
- Lei Yu,
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Antifungal Activity and Biochemical Profiling of Exudates from Germinating Maize Nostrano di Storo Local Variety. PLANTS 2022; 11:plants11182435. [PMID: 36145846 PMCID: PMC9505497 DOI: 10.3390/plants11182435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 09/06/2022] [Accepted: 09/15/2022] [Indexed: 11/16/2022]
Abstract
Plant pathogens are responsible for important damages to valuable crops causing important economic losses. Agrobiodiversity protection is crucial for the valorization of local varieties that could possess higher resistance to biotic and abiotic stress. At the beginning of germination, seeds are susceptible to pathogens attacks, thus they can release endogenous antimicrobial compounds of different natures in the spermosphere, to contrast proliferation of microorganisms. The work aimed at characterizing the maize of local variety Nostrano di Storo seed exudates secreted during the first phases of germination, to identify compounds active in the defense towards pathogens. Storo seed exudates were proven to inhibit F. verticilloides germination. In order to investigate the cause of the described effect, compositional profiling of the exudates was performed through NMR, lipidomic, and proteomic analyses. This study suggests an important role of microbial endophytic communities in the protection of the seed during the early phases of the germination process and their interplay with fatty acids released by the seeds, rather than a specific antifungal compound. The valorization of agronomically acceptable maize lines with pre-harvest enhanced resistances to pathogens contamination could lead, in the near future, to commercially available varieties potentially requiring more limited chemical protective treatments.
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Gerna D, Clara D, Antonielli L, Mitter B, Roach T. Seed Imbibition and Metabolism Contribute Differentially to Initial Assembly of the Soybean Holobiont. PHYTOBIOMES JOURNAL 2022; 8:21-33. [PMID: 38818306 PMCID: PMC7616048 DOI: 10.1094/pbiomes-03-23-0019-mf] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/01/2024]
Abstract
Seed germination critically determines successful plant establishment and agricultural productivity. In the plant holobiont's life cycle, seeds are hubs for microbial communities' assembly, but what exactly shapes the holobiont during germination remains unknown. Here, 16S rRNA gene amplicon sequencing characterized the bacterial communities in embryonic compartments (cotyledons and axes) and on seed coats pre- and post-germination of four soybean (Glycine max) cultivars, in the presence or absence of exogenous abscisic acid (ABA), which prevented germination and associated metabolism of seeds that had imbibed. Embryonic compartments were metabolically profiled during germination to design minimal media mimicking the seed endosphere for bacterial growth assays. The distinction between embryonic and seed coat bacterial microbiomes of dry seeds weakened during germination, resulting in the plumule, radicle, cotyledon, and seed coat all hosting the same most abundant and structurally influential genera in germinated seeds of every cultivar. Treatment with ABA prevented the increase of bacterial microbiomes' richness, but not taxonomic homogenization across seed compartments. Growth assays on minimal media containing the most abundant metabolites that accumulated in germinated seeds revealed that seed reserve mobilization promoted enrichment of copiotrophic bacteria. Our data show that seed imbibition enabled distribution of seed-coat-derived epiphytes into embryos irrespective of germination, while germinative metabolism promoted proliferation of copiotrophic taxa, which predominated in germinated seeds.
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Affiliation(s)
- Davide Gerna
- Department of Botany and Center for Molecular Biosciences Innsbruck, University of Innsbruck, 6020 Innsbruck, Austria
| | - David Clara
- Department of Botany and Center for Molecular Biosciences Innsbruck, University of Innsbruck, 6020 Innsbruck, Austria
| | - Livio Antonielli
- Center for Health & Bioresources, Bioresources Unit, AIT Austrian Institute of Technology GmbH, 3430 Tulln, Austria Accepted for publication 17 August 2023
| | - Birgit Mitter
- Center for Health & Bioresources, Bioresources Unit, AIT Austrian Institute of Technology GmbH, 3430 Tulln, Austria Accepted for publication 17 August 2023
| | - Thomas Roach
- Department of Botany and Center for Molecular Biosciences Innsbruck, University of Innsbruck, 6020 Innsbruck, Austria
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Dumigan CR, Deyholos MK. Cannabis Seedlings Inherit Seed-Borne Bioactive and Anti-Fungal Endophytic Bacilli. PLANTS (BASEL, SWITZERLAND) 2022; 11:2127. [PMID: 36015430 PMCID: PMC9415172 DOI: 10.3390/plants11162127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/09/2022] [Accepted: 08/11/2022] [Indexed: 06/15/2023]
Abstract
Throughout the hundreds of millions of years of co-evolution, plants and microorganisms have established intricate symbiotic and pathogenic relationships. Microbial communities associated with plants are in constant flux and can ultimately determine whether a plant will successfully reproduce or be destroyed by their environment. Inheritance of beneficial microorganisms is an adaptation plants can use to protect germinating seeds against biotic and abiotic stresses as seedlings develop. The interest in Cannabis as a modern crop requires research into effective biocontrol of common fungal pathogens, an area that has seen little research. This study examines the seed-borne endophytes present across 15 accessions of Cannabis grown to seed across Western Canada. Both hemp and marijuana seedlings inherited a closely related group of bioactive endophytic Bacilli. All Cannabis accessions possessed seed-inherited Paenibacillus mobilis with the capacity to solubilize mineral phosphate. Additionally, seeds were found to carry genera of fungal isolates known to be Cannabis pathogens and post-harvest molds: Alternaria, Penicillium, Cladosporium, Chaetomium, Aspergillus, Rhizopus, and Fusarium. Thirteen seed-borne endophytes showed antibiotic activity against Alternaria, Aspergillus, Penicillium, and Fusarium. This study suggests both fungal pathogens and bacterial endophytes that antagonize them are vectored across generations in Cannabis as they compete over this shared niche.
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Laranjeira SS, Alves IG, Marques G. Chickpea (Cicer arietinum L.) Seeds as a Reservoir of Endophytic Plant Growth-Promoting Bacteria. Curr Microbiol 2022; 79:277. [PMID: 35907956 DOI: 10.1007/s00284-022-02942-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 06/17/2022] [Indexed: 11/30/2022]
Abstract
The seed microbiome, the primary source of inoculum for plants, may play an important role in plant growth, health and productivity. However, the structure and function of chickpea seed endophytes are poorly characterized. Bacteria with beneficial characteristics can be selected by the plant and transmitted vertically via the seed to benefit the next generation. Studying the diversity and multifunctionality of seed microbial communities can provide innovative opportunities in the field of plant-microbe interaction. This study aimed to isolate, identify and characterize culturable endophytic bacteria from chickpea (Cicer arietinum L.) seeds. Phylogenetic analysis based on 16S rDNA showed that the endophytic bacteria belong to the genera Mesorhizobium, Burkholderia, Bacillus, Priestia, Paenibacillus, Alcaligenes, Acinetobacter, Rahnella, Enterobacter, Tsukamurella, and Microbacterium. The most frequently observed genus was Bacillus; however, rhizobia typically associated with chickpea roots were also found, which is a novel finding of this study. Siderophore production and phosphorus solubilization were the most widespread plant growth-promoting features, while hydrogen cyanide production was relatively rare among the isolates. Most of the isolates possess two or more plant growth-promoting features; however, only Bacillus thuringiensis Y2B, a well-known entomopathogenic bacteria, exhibited the presence of all plant growth-promoting traits evaluated. Results suggest that endophytic bacteria such as Bacillus, Mesorhizobium, and Burkholderia may be vertically transferred from inoculated plants to seeds to benefit the next generation.
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Affiliation(s)
- Sara S Laranjeira
- Centre for Research and Technology of Agro-Environmental and Biological Sciences, CITAB, University of Trás-os-Montes e Alto Douro, UTAD, Quinta de Prados, 5000-801, Vila Real, Portugal
| | - Isabel G Alves
- Centre for Research and Technology of Agro-Environmental and Biological Sciences, CITAB, University of Trás-os-Montes e Alto Douro, UTAD, Quinta de Prados, 5000-801, Vila Real, Portugal
| | - Guilhermina Marques
- Centre for Research and Technology of Agro-Environmental and Biological Sciences, CITAB, University of Trás-os-Montes e Alto Douro, UTAD, Quinta de Prados, 5000-801, Vila Real, Portugal.
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Pandey SS, Jain R, Bhardwaj P, Thakur A, Kumari M, Bhushan S, Kumar S. Plant Probiotics – Endophytes pivotal to plant health. Microbiol Res 2022; 263:127148. [DOI: 10.1016/j.micres.2022.127148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 04/22/2022] [Accepted: 07/26/2022] [Indexed: 12/11/2022]
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Seed-Derived Microbial Community of Wild Cicer Seedlings: Composition and Augmentation to Domesticated Cicer. Microbiol Spectr 2022; 10:e0278521. [PMID: 35638782 PMCID: PMC9241877 DOI: 10.1128/spectrum.02785-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Seed-borne bacteria are a unique group of microorganisms capable of maintaining stable populations within plant tissues and seeds. These bacteria may benefit their host from germination to maturation and are of great interest for basic and applied plant-microbe interaction studies. Furthermore, many such beneficial bacteria present in wild plant species are missing in their respective congeneric domesticated forms. The objectives of this study were to explore the bacterial communities within the seeds of wild Cicer species and to select beneficial bacteria which could be used to improve production of domesticated chickpea (C. arietinum). We analyzed the composition of seed-borne bacteria of chickpea (Cicer spp.), comparing wild and domesticated species from different geographic locations. Subsequently, we isolated the dominant and prevalent seed-borne bacteria from wild Cicer judaicum and assessed their ability to colonize and affect the growth of domesticated chickpea and other legume crops. The composition and structure of seed-borne bacteria, determined by amplicon sequencing of the 16S rRNA gene, differed between wild and domesticated chickpea and varied among geographic locations. The genus Burkholderia dominated samples from domesticated chickpea at all examined sites, while Bacillus or Sphingomonas dominated cultures isolated from wild C. judaicum, dependent on geographic location. A particular Bacillus strain, Bacillus sp. CJ, representing the most prevalent bacterium in wild C. judaicum, was further isolated. Bacillus sp. CJ, applied by seed coating, successfully inhabited domesticated chickpea plants and improved plant growth parameters. These results demonstrate the potential for reconstructing the microbiota of crop plants using the wild microbiota reservoir. IMPORTANCE Chickpea (garbanzo bean, hummus, Cicer arietinum) representing the third legume crop produced globally. As is the case for many other domesticated crops, the adaptation and resistance of chickpea to biotic and abiotic stresses is inferior compared to that of their wild progenitors and relatives. Re-establishing desirable characteristics from wild to domesticated species may be achieved by reconstructing beneficial microbiota. In this study, we examined the seed-associated microbiota of both wild and domesticated chickpea and applied isolated beneficial bacteria originating from wild Cicer judaicum to domesticated chickpea by seed coating. This isolate, Bacillus sp. CJ, was successfully established in the crop and enhanced its growth, demonstrating effective and efficient manipulation of the chickpea microbiota as a potential model for future application in other crop plants.
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Abdelfattah A, Tack AJM, Wasserman B, Liu J, Berg G, Norelli J, Droby S, Wisniewski M. Evidence for host-microbiome co-evolution in apple. THE NEW PHYTOLOGIST 2022; 234:2088-2100. [PMID: 34823272 PMCID: PMC9299473 DOI: 10.1111/nph.17820] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 10/18/2021] [Indexed: 05/07/2023]
Abstract
Plants evolved in association with a diverse community of microorganisms. The effect of plant phylogeny and domestication on host-microbiome co-evolutionary dynamics are poorly understood. Here we examined the effect of domestication and plant lineage on the composition of the endophytic microbiome of 11 Malus species, representing three major groups: domesticated apple (M. domestica), wild apple progenitors, and wild Malus species. The endophytic community of M. domestica and its wild progenitors showed higher microbial diversity and abundance than wild Malus species. Heirloom and modern cultivars harbored a distinct community composition, though the difference was not significant. A community-wide Bayesian model revealed that the endophytic microbiome of domesticated apple is an admixture of its wild progenitors, with clear evidence for microbiome introgression, especially for the bacterial community. We observed a significant correlation between the evolutionary distance of Malus species and their microbiome. This study supports co-evolution between Malus species and their microbiome during domestication. This finding has major implications for future breeding programs and our understanding of the evolution of plants and their microbiomes.
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Affiliation(s)
- Ahmed Abdelfattah
- Institute of Environmental BiotechnologyGraz University of TechnologyPetersgasse 12Graz8010Austria
- Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB)Max‐Eyth Allee 10014469PotsdamGermany
| | - Ayco J. M. Tack
- Department of Ecology, Environment and Plant SciencesStockholm UniversitySvante Arrhenius väg 20AStockholmSE‐106 91Sweden
| | - Birgit Wasserman
- Institute of Environmental BiotechnologyGraz University of TechnologyPetersgasse 12Graz8010Austria
| | - Jia Liu
- Chongqing Key Laboratory of Economic Plant BiotechnologyCollege of Landscape Architecture and Life SciencesChongqing University of Arts and SciencesYongchuanChongquing402160China
| | - Gabriele Berg
- Institute of Environmental BiotechnologyGraz University of TechnologyPetersgasse 12Graz8010Austria
- Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB)Max‐Eyth Allee 10014469PotsdamGermany
- Institute for Biochemistry and BiologyUniversity of Postdam14476Potsdam OT GolmGermany
| | - John Norelli
- Appalachian Fruit Research StationUnited States Department of Agriculture – Agricultural Research ServiceKearneysvilleWV25430USA
| | - Samir Droby
- Department of Postharvest ScienceAgricultural Research OrganizationThe Volcani InstitutePO Box 15159Rishon LeZion7505101Israel
| | - Michael Wisniewski
- Department of Biological SciencesVirginia Polytechnic Institute and State University220 Ag Quad LnBlacksburgVA24061USA
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Simonin M, Briand M, Chesneau G, Rochefort A, Marais C, Sarniguet A, Barret M. Seed microbiota revealed by a large-scale meta-analysis including 50 plant species. THE NEW PHYTOLOGIST 2022; 234:1448-1463. [PMID: 35175621 DOI: 10.1111/nph.18037] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 01/03/2022] [Indexed: 05/15/2023]
Abstract
Seed microbiota constitutes a primary inoculum for plants that is gaining attention owing to its role for plant health and productivity. Here, we performed a meta-analysis on 63 seed microbiota studies covering 50 plant species to synthesize knowledge on the diversity of this habitat. Seed microbiota are diverse and extremely variable, with taxa richness varying from one to thousands of taxa. Hence, seed microbiota presents a variable (i.e. flexible) microbial fraction but we also identified a stable (i.e. core) fraction across samples. Around 30 bacterial and fungal taxa are present in most plant species and in samples from all over the world. Core taxa, such as Pantoea agglomerans, Pseudomonas viridiflava, P. fluorescens, Cladosporium perangustum and Alternaria sp., are dominant seed taxa. The characterization of the core and flexible seed microbiota provided here will help uncover seed microbiota roles for plant health and design effective microbiome engineering.
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Affiliation(s)
- Marie Simonin
- Institut Agro, INRAE, IRHS, SFR QUASAV, Université d'Angers, F-49000, Angers, France
| | - Martial Briand
- Institut Agro, INRAE, IRHS, SFR QUASAV, Université d'Angers, F-49000, Angers, France
| | - Guillaume Chesneau
- Institut Agro, INRAE, IRHS, SFR QUASAV, Université d'Angers, F-49000, Angers, France
| | - Aude Rochefort
- Institut Agro, INRAE, IRHS, SFR QUASAV, Université d'Angers, F-49000, Angers, France
| | - Coralie Marais
- Institut Agro, INRAE, IRHS, SFR QUASAV, Université d'Angers, F-49000, Angers, France
| | - Alain Sarniguet
- Institut Agro, INRAE, IRHS, SFR QUASAV, Université d'Angers, F-49000, Angers, France
| | - Matthieu Barret
- Institut Agro, INRAE, IRHS, SFR QUASAV, Université d'Angers, F-49000, Angers, France
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Begum N, Wang L, Ahmad H, Akhtar K, Roy R, Khan MI, Zhao T. Co-inoculation of Arbuscular Mycorrhizal Fungi and the Plant Growth-Promoting Rhizobacteria Improve Growth and Photosynthesis in Tobacco Under Drought Stress by Up-Regulating Antioxidant and Mineral Nutrition Metabolism. MICROBIAL ECOLOGY 2022; 83:971-988. [PMID: 34309697 DOI: 10.1007/s00248-021-01815-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 07/01/2021] [Indexed: 06/13/2023]
Abstract
Drought stress is a major environmental concern that limits crop growth on a large scale around the world. Significant efforts are required to overcome this issue in order to improve crop production. Therefore, the exciting role of beneficial microorganisms under stress conditions needs to be deeply explored. In this study, the role of two biotic entities, i.e., Arbuscular mycorrhizal fungi (AMF, Glomus versiforme) and plant growth-promoting rhizobacteria (PGPR, Bacillus methylotrophicus) inoculation in drought tolerance of tobacco (Nicotiana tabacum L.), was investigated. The present results showed that drought stress considerably reduced tobacco plant's growth and their physiological attributes. However, the plants co-inoculated with AMF and PGPR showed higher drought tolerance by bringing up significant improvement in the growth and biomass of tobacco plants. Moreover, the co-inoculation of AMF and PGPR considerably increased chlorophyll a, b, total chlorophylls, carotenoids, photosynthesis, and PSII efficiency by 96.99%, 76.90%, and 67.96% and 56.88%, 53.22%, and 33.43% under drought stress conditions, respectively. Furthermore, it was observed that drought stress enhanced lipid peroxidation and electrolyte leakage. However, the co-inoculation of AMF and PGPR reduced the electrolyte leakage and lipid peroxidation and significantly enhanced the accumulation of phenols and flavonoids by 57.85% and 71.74%. Similarly, the antioxidant enzymatic activity and the plant nutrition status were also considerably improved in co-inoculated plants under drought stress. Additionally, the AMF and PGPR inoculation also enhanced abscisic acid (ABA) and indole-3-acetic acid (IAA) concentrations by 67.71% and 54.41% in the shoots of tobacco plants. The current findings depicted that inoculation of AMF and PGPR (alone or in combination) enhanced the growth and mitigated the photosynthetic alteration with the consequent up-regulation of secondary metabolism, osmolyte accumulation, and antioxidant system.
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Affiliation(s)
- Naheeda Begum
- National Center for Soybean Improvement, Key Laboratory of Biology and Genetics and Breeding for Soybean, Ministry of Agriculture, State Key Laboratory for Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 210095, China
| | - Ling Wang
- National Center for Soybean Improvement, Key Laboratory of Biology and Genetics and Breeding for Soybean, Ministry of Agriculture, State Key Laboratory for Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 210095, China
| | - Husain Ahmad
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, China
| | - Kashif Akhtar
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bio-resources, College of Life Science and Technology, Guangxi University, Nanning, 530004, China
| | - Rana Roy
- Department of Agroforestry and Environmental Science, Sylhet Agricultural University, Sylhet, 3100, Bangladesh
| | - Muhammad Ishfaq Khan
- Department of Weed Science, the University of Agriculture Peshawar, Peshawar, 25130, Pakistan
| | - Tuanjie Zhao
- National Center for Soybean Improvement, Key Laboratory of Biology and Genetics and Breeding for Soybean, Ministry of Agriculture, State Key Laboratory for Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 210095, China.
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The microscopic mechanism between endophytic fungi and host plants: From recognition to building stable mutually beneficial relationships. Microbiol Res 2022; 261:127056. [DOI: 10.1016/j.micres.2022.127056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 04/27/2022] [Accepted: 04/27/2022] [Indexed: 11/21/2022]
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Dynamics, phylogeny and phyto-stimulating potential of chitinase synthesizing bacterial root endosymbiosiome of North Western Himalayan Brassica rapa L. Sci Rep 2022; 12:6742. [PMID: 35468936 PMCID: PMC9038727 DOI: 10.1038/s41598-022-11030-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 04/18/2022] [Indexed: 12/21/2022] Open
Abstract
The less phytopathogen susceptibility in Himalayan Brassica rapa L. has made it an exceptional crop eluding synthetic pesticide inputs, thereby guarantying economically well-founded and ecologically sustainable agriculture. The relevance of niche microflora of this crop has not been deliberated in this context, as endosymbiosiome is more stable than their rhizosphere counterparts on account of their restricted acquaintance with altering environment; therefore, the present investigation was carried out to study the endophytic microfloral dynamics across the B. rapa germplasm in context to their ability to produce chitinase and to characterize the screened microflora for functional and biochemical comportments in relevance to plant growth stimulation. A total of 200 colonies of bacterial endophytes were isolated from the roots of B. rapa across the J&K UT, comprising 66 locations. After morphological, ARDRA, and sequence analysis, eighty-one isolates were selected for the study, among the isolated microflora Pseudomonas sp. Bacillus sp. dominated. Likewise, class γ-proteobacteria dominated, followed by Firmicutes. The diversity studies have exposed changing fallouts on all the critical diversity indices, and while screening the isolated microflora for chitinase production, twenty-two strains pertaining to different genera produced chitinase. After carbon source supplementation to the chitinase production media, the average chitinase activity was significantly highest in glycerol supplementation. These 22 strains were further studied, and upon screening them for their fungistatic behavior against six fungal species, wide diversity was observed in this context. The antibiotic sensitivity pattern of the isolated strains against chloramphenicol, rifampicin, amikacin, erythromycin, and polymyxin-B showed that the strains were primarily sensitive to chloramphenicol and erythromycin. Among all the strains, only eleven produced indole acetic acid, ten were able to solubilize tricalcium phosphate and eight produced siderophores. The hydrocyanic acid and ammonia production was observed in seven strains each. Thus, the present investigation revealed that these strains could be used as potential plant growth promoters in sustainable agriculture systems besides putative biocontrol agents.
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Cui J, Yi Z, Fu Y, Liu H. Simulated microgravity shapes the endophytic bacterial community by affecting wheat root metabolism. Environ Microbiol 2022; 24:3355-3368. [PMID: 35437853 DOI: 10.1111/1462-2920.16015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 04/12/2022] [Indexed: 11/30/2022]
Abstract
To improve nutrient utilization and pathogenic resistance of plants in space, it is crucial to understand the effects of microgravity on the plant root microbiome. However, the finer details of whether and how microgravity affects the root microbiome remain unclear. Here, we found that simulated microgravity elicits no significant changes in fungal community composition and diversity, whether rhizosphere or endophytic. However, simulated microgravity caused a significant change in the composition and diversity of endophytic bacteria of wheat seedlings, but not in rhizosphere bacteria. The alteration of endophytic bacterial communities demonstrates that wheat seedlings adopt strategies to recruit additional endophytic Enterobacteriaceae and increase the stability of the endophytic bacterial network to respond to the challenge of simulated microgravity. Furthermore, our results also suggest that the corresponding changes in endophytic bacteria under simulated microgravity is closely related to a significant decrease in metabolites of the host's carbon metabolism, flavonoid biosynthesis, benzoxazinoid biosynthesis, and tryptophan metabolism pathways. Our findings reveal details important to our understanding of the impact of gravity on the microbial community of plant seedlings and the theoretical basis for manipulation of microorganisms to ensure efficient plant production in space. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Jingjing Cui
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, China
| | - Zhihao Yi
- China School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, 100083, China
| | - Yuming Fu
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, China.,State Key Laboratory of Virtual Reality Technology and Systems, School of Computer Science and Engineering, Beihang University, Beijing, 100083, China.,International Joint Research Center of Aerospace Biotechnology & Medical Engineering, Beihang University, Beijing, 100083, China
| | - Hong Liu
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, China.,State Key Laboratory of Virtual Reality Technology and Systems, School of Computer Science and Engineering, Beihang University, Beijing, 100083, China.,International Joint Research Center of Aerospace Biotechnology & Medical Engineering, Beihang University, Beijing, 100083, China
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Thomas P, Rajendran TP, Franco CMM. Cytobacts: Abundant and Diverse Vertically Seed-Transmitted Cultivation-Recalcitrant Intracellular Bacteria Ubiquitous to Vascular Plants. Front Microbiol 2022; 13:806222. [PMID: 35369514 PMCID: PMC8967353 DOI: 10.3389/fmicb.2022.806222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Accepted: 01/26/2022] [Indexed: 11/25/2022] Open
Abstract
We have recently described ‘Cytobacts’ as abundant intracellular endophytic bacteria inhabiting live plant cells based on the observations with callus and cell suspension cultures of grapevine and other plant species with the origin ascribable to field explants. In this study, we investigated the prevalence of such cytoplasmic bacterial associations in field plants across different taxa, their cultivability, and the extent of taxonomic diversity and explored the possibility of their embryo-mediated vertical transmission. Over 100 genera of field plants were surveyed for ‘Cytobacts’ through bright-field live-cell imaging as per our previous experience using fresh tissue sections from surface-sterilized shoot-tissues with parallel cultivation-based assessments. This revealed widespread cellular bacterial associations visualized as copious motile micro-particles in the cytoplasm with no or sparse colony forming units (CFU) from the tissue-homogenates indicating their general non-cultivability. Based on the ease of detection and the abundance of ‘Cytobacts’ in fresh tissue sections, the surveyed plants were empirically classified into three groups: (i) motile bacteria detected instantly in most cells; (ii) motility not so widely observed, but seen in some cells; and (iii) only occasional motile units observed, but abundant non-motile bacterial cells present. Microscopy versus 16S-rRNA V3–V4 amplicon profiling on shoot-tip tissues of four representative plants—tomato, watermelon, periwinkle, and maize—showed high bacterial abundance and taxonomic diversity (11–15 phyla) with the dominance of Proteobacteria followed by Firmicutes/Actinobacteria, and several other phyla in minor shares. The low CFU/absence of bacterial CFU from the tissue homogenates on standard bacteriological media endorsed their cultivation-recalcitrance. Intracellular bacterial colonization implied that the associated organisms are able to transmit vertically to the next generation through the seed-embryos. Microscopy and 16S-rRNA V3–V4 amplicon/metagenome profiling of mature embryos excised from fresh watermelon seeds revealed heavy embryo colonization by diverse bacteria with sparse or no CFU. Observations with grapevine fresh fruit-derived seeds and seed-embryos endorsed the vertical transmission by diverse cultivation-recalcitrant endophytic bacteria (CREB). By and large, Proteobacteria formed the major phylum in fresh seed-embryos with varying shares of diverse phyla. Thus, we document ‘Cytobacts’ comprising diverse and vertically transmissible CREBs as a ubiquitous phenomenon in vascular plants.
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Affiliation(s)
- Pious Thomas
- Thomas Biotech & Cytobacts Centre for Biosciences, Bengaluru, India.,Division of Biotechnology, ICAR-Indian Institute of Horticultural Research, Bengaluru, India
| | - Thekepat P Rajendran
- Research Information System for Developing Countries, India Habitat Centre, New Delhi, India
| | - Christopher M M Franco
- Department of Medical Biotechnology, College of Medicine & Public Health, Flinders University, Bedford Park, Adelaide, SA, Australia
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