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Guan L, Wang H, Chen J, Yang F, Yang J, Li J, Jin L. Isolation and Identification of Culturable Bacteria from South China Seawater and Preliminary Screening of Marine Biocontrol Bacteria. Microorganisms 2023; 11:2933. [PMID: 38138077 PMCID: PMC10746102 DOI: 10.3390/microorganisms11122933] [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: 10/31/2023] [Revised: 11/29/2023] [Accepted: 11/30/2023] [Indexed: 12/24/2023] Open
Abstract
Marine microorganisms have evolved special metabolic pathways to produce numerous bioactive substances with novel structures and unique functions. This study analyzed the diversity of culturable bacteria in marine water samples from the South China Sea and screened the isolated bacteria with pathogenic fungi. A total of 200 culturable strains of 72 different bacteria were obtained from 56 water samples from the South China Sea. They belonged to three phyla and four classes, namely Gammaproteobacteria, Alphaproteobacteria, Bacilli and Actinomycetia. Bacilli was the dominant class, comprising up to 59.72%, followed by Gammaproteobacteria (20.83%). Bacillus, Pseudomonas, Paenibacillus and Rhizobium were the most dominant genera. Among these strains, HY-88 and HY-91 encoding BamC, FenB and PKSI genes were selected and identified as Bacillus subtilis. The respective inhibition rates of the HY-88 caused by plate confrontation against Magnaporthe grisea, Fusarium oxysporum, Botrytis cinerea, anthrax and Botrytis cinerea were 90.91%, 54.29%, 52.17% and 51.72%, in comparison with HY-91 86.36%, 48.57%, 47.83% and 34.48%. In addition, the supernatant of HY-88 showed a lesion inhibition rate of 74.5%, which was significantly higher than HY-91 (60.55%). In addition, HY-88 and HY-91 showed strong antifungal activity to Colletotrichum viniferum on detached Shine Muscat grapes. Tolerance tests showed that the HY-88 and HY-91 grew at 10-40 °C, 7-10% NaCl and pH 3-11. HY-88 and HY-91 could inhibit various fungal plant diseases, which lays a foundation for the development of new biopesticides.
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Affiliation(s)
- Limei Guan
- Institute of Biological Resources, Jiangxi Academy of Sciences, Nanchang 330029, China; (L.G.); (J.C.); (F.Y.); (J.Y.); (J.L.)
| | - Hongxiu Wang
- Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330029, China;
| | - Junhui Chen
- Institute of Biological Resources, Jiangxi Academy of Sciences, Nanchang 330029, China; (L.G.); (J.C.); (F.Y.); (J.Y.); (J.L.)
| | - Feiying Yang
- Institute of Biological Resources, Jiangxi Academy of Sciences, Nanchang 330029, China; (L.G.); (J.C.); (F.Y.); (J.Y.); (J.L.)
| | - Jian Yang
- Institute of Biological Resources, Jiangxi Academy of Sciences, Nanchang 330029, China; (L.G.); (J.C.); (F.Y.); (J.Y.); (J.L.)
| | - Jianghuai Li
- Institute of Biological Resources, Jiangxi Academy of Sciences, Nanchang 330029, China; (L.G.); (J.C.); (F.Y.); (J.Y.); (J.L.)
| | - Liang Jin
- Institute of Biological Resources, Jiangxi Academy of Sciences, Nanchang 330029, China; (L.G.); (J.C.); (F.Y.); (J.Y.); (J.L.)
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Yagoubi A, Mahjoubi Y, Giannakis S, Rzigui T, Djebali W, Chouari R. The silver lining of antibiotic resistance: Bacterial-mediated reduction of tetracycline plant stress via antibiotrophy. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2023; 204:108093. [PMID: 37857085 DOI: 10.1016/j.plaphy.2023.108093] [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: 06/26/2023] [Revised: 09/24/2023] [Accepted: 10/12/2023] [Indexed: 10/21/2023]
Abstract
The reuse of water using effluents containing antibiotics from anthropogenic activities has been mainly linked to the development of antibiotic resistance. However, we report that the development of bacterial tolerance promotes plant growth. In the present study, we aimed to evaluate the efficiency of inoculation of a new antibiotic-degrading bacterium, Erwinia strain S9, in augmenting the tolerance of pea (Pisum sativum L.) plants to tetracycline (TET) (10 and 20 mg/L). Physiological parameters such as tissue elongation and biomass, as well as relative water content, were remarkably lower in plants exposed to TET than in the control. The inhibitory effects of TET were associated with reduced CO2 assimilation, stomatal conductance, transpiration, dark respiration, and light saturation point (LSP). High concentrations of TET-induced oxidative stress are attested by the overproduction of superoxide radicals (O2•-), hydrogen peroxide (H2O2), and hydroxyl radicals (HO•), resulting in increased malondialdehyde content and cell death. The high activity of antioxidant enzymes such as catalase, ascorbate peroxidase, and guaiacol peroxidase validated the proposed mechanism. Under TET stress conditions, supplementation with Erwinia strain S9 was beneficial to pea plants through osmotic adjustment, increased nutrient uptake, gas exchange optimization, and increased antioxidant activities. Its presence not only ensures plant survival and growth during antibiotic stress but also degrades TET via significant antibiotrophy. This strategy is a cost-effective environmental chemical engineering tool that can be used to depollute wastewater or to improve crop resistance in rhizofiltration treatment when treated wastewater is reused for irrigation.
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Affiliation(s)
- Amira Yagoubi
- University of Carthage, Laboratory of Plant Toxicology and Environmental Microbiology (LR18ES38), Faculty of Sciences of Bizerte, 7021, Bizerte, Tunisia; Universidad Politécnica de Madrid (UPM), E.T.S. de Ingenieros de Caminos, Canales y Puertos, Departamento de Ingeniería Civil: Hidráulica, Energía y Medio Ambiente, Unidad docente Ingeniería Sanitaria, c/ Profesor Aranguren, s/n, ES-28040, Madrid, Spain
| | - Yathreb Mahjoubi
- University of Carthage, Laboratory of Plant Toxicology and Environmental Microbiology (LR18ES38), Faculty of Sciences of Bizerte, 7021, Bizerte, Tunisia
| | - Stefanos Giannakis
- Universidad Politécnica de Madrid (UPM), E.T.S. de Ingenieros de Caminos, Canales y Puertos, Departamento de Ingeniería Civil: Hidráulica, Energía y Medio Ambiente, Unidad docente Ingeniería Sanitaria, c/ Profesor Aranguren, s/n, ES-28040, Madrid, Spain
| | - Touhami Rzigui
- National Research Institute for Rural Engineering Water and Forests (INRGREF), Laboratory for the Management and Valorization of Forest Products (LGVPF), Tunis, Tunisia
| | - Wahbi Djebali
- University of Carthage, Laboratory of Plant Toxicology and Environmental Microbiology (LR18ES38), Faculty of Sciences of Bizerte, 7021, Bizerte, Tunisia
| | - Rakia Chouari
- University of Carthage, Laboratory of Plant Toxicology and Environmental Microbiology (LR18ES38), Faculty of Sciences of Bizerte, 7021, Bizerte, Tunisia.
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Huang C, Li L, Wang L, Bao J, Zhang X, Yan J, Wu J, Cao N, Wang J, Zhao L, Liu X, Yu X, Zhu X, Lin F. The Amino Acid Permease MoGap1 Regulates TOR Activity and Autophagy in Magnaporthe oryzae. Int J Mol Sci 2022; 23:13663. [PMID: 36362450 PMCID: PMC9655246 DOI: 10.3390/ijms232113663] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 11/01/2022] [Accepted: 11/02/2022] [Indexed: 08/26/2023] Open
Abstract
Rice is an important food crop all over the world. It can be infected by the rice blast fungus Magnaporthe oryzae, which results in a significant reduction in rice yield. The infection mechanism of M. oryzae has been an academic focus for a long time. It has been found that G protein, AMPK, cAMP-PKA, and MPS1-MAPK pathways play different roles in the infection process. Recently, the function of TOR signaling in regulating cell growth and autophagy by receiving nutritional signals generated by plant pathogenic fungi has been demonstrated, but its regulatory mechanism in response to the nutritional signals remains unclear. In this study, a yeast amino acid permease homologue MoGap1 was identified and a knockout mutant of MoGap1 was successfully obtained. Through a phenotypic analysis, a stress analysis, autophagy flux detection, and a TOR activity analysis, we found that the deletion of MoGap1 led to a sporulation reduction as well as increased sensitivity to cell wall stress and carbon source stress in M. oryzae. The ΔMogap1 mutant showed high sensitivity to the TOR inhibitor rapamycin. A Western blot analysis further confirmed that the TOR activity significantly decreased, which improved the level of autophagy. The results suggested that MoGap1, as an upstream regulator of TOR signaling, regulated autophagy and responded to adversities such as cell wall stress by regulating the TOR activity.
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Affiliation(s)
- Changli Huang
- Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine, College of Life Sciences, China Jiliang University, Hangzhou 310018, China
| | - Lin Li
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection, Ministry of Agriculture and Rural Affairs, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Lei Wang
- College of Advanced Agricultural Sciences, Zhejiang Agriculture and Forest University, Hangzhou 310007, China
| | - Jiandong Bao
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection, Ministry of Agriculture and Rural Affairs, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Xiaozhi Zhang
- College of Advanced Agricultural Sciences, Zhejiang Agriculture and Forest University, Hangzhou 310007, China
| | - Jiongyi Yan
- State Key Laboratory of Rice Biology, Institute of Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Jiaqi Wu
- Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine, College of Life Sciences, China Jiliang University, Hangzhou 310018, China
| | - Na Cao
- College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Jiaoyu Wang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection, Ministry of Agriculture and Rural Affairs, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
- College of Advanced Agricultural Sciences, Zhejiang Agriculture and Forest University, Hangzhou 310007, China
- State Key Laboratory of Rice Biology, Institute of Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Lili Zhao
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection, Ministry of Agriculture and Rural Affairs, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Xiaohong Liu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection, Ministry of Agriculture and Rural Affairs, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
- State Key Laboratory of Rice Biology, Institute of Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Xiaoping Yu
- Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine, College of Life Sciences, China Jiliang University, Hangzhou 310018, China
| | - Xueming Zhu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection, Ministry of Agriculture and Rural Affairs, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
- College of Advanced Agricultural Sciences, Zhejiang Agriculture and Forest University, Hangzhou 310007, China
| | - Fucheng Lin
- Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine, College of Life Sciences, China Jiliang University, Hangzhou 310018, China
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection, Ministry of Agriculture and Rural Affairs, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
- College of Advanced Agricultural Sciences, Zhejiang Agriculture and Forest University, Hangzhou 310007, China
- State Key Laboratory of Rice Biology, Institute of Biotechnology, Zhejiang University, Hangzhou 310058, China
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Maize Apoplastic Fluid Bacteria Alter Feeding Characteristics of Herbivore (Spodoptera frugiperda) in Maize. Microorganisms 2022; 10:microorganisms10091850. [PMID: 36144452 PMCID: PMC9505285 DOI: 10.3390/microorganisms10091850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/23/2021] [Accepted: 09/28/2021] [Indexed: 11/17/2022] Open
Abstract
Maize is an important cereal crop which is severely affected by Spodoptera frugiperda. The study aims to identify endophytic bacteria of maize root and leaf apoplastic fluid with bioprotective traits against S. frugiperda and plant growth promoting properties. Among 15 bacterial endophytic isolates, two strains—namely, RAF5 and LAF5—were selected and identified as Alcaligenes sp. MZ895490 and Bacillus amyloliquefaciens MZ895491, respectively. The bioprotective potential of B. amyloliquefaciens was evaluated through bioassays. In a no-choice bioassay, second instar larvae of S. frugiperda fed on B. amyloliquefaciens treated leaves (B+) recorded comparatively lesser growth (1.10 ± 0.19 mg mg−1 day−1) and consumptive (7.16 ± 3.48 mg mg−1 day−1) rates. In larval dip and choice bioassay, the same trend was observed. In detached leaf experiment, leaf feeding deterrence of S. frugiperda was found to be greater due to inoculation with B. amyloliquefaciens than Alcaligenes sp. The phenolics content of B. amyloliquefaciens inoculated plant was also found to be greater (3.06 ± 0.09 mg gallic acid g−1). However, plant biomass production was more in Alcaligenes sp inoculated treatment. The study thus demonstrates the potential utility of Alcaligenes sp. and B. amyloliquefaciens for improving growth and biotic (S. frugiperda) stress tolerance in maize.
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Swain BB, Mohapatra PK, Naik SK, Mukherjee AK. Biopriming for induction of disease resistance against pathogens in rice. PLANTA 2022; 255:113. [PMID: 35503188 DOI: 10.1007/s00425-022-03900-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/11/2022] [Indexed: 06/14/2023]
Abstract
Rice is attacked by an armada of pathogens. Present review provides a critical evaluation of the potential of different biotic agents used to protect rice yield drop from pathogenicity and an account of unexplored areas, which might be taken into consideration to manage rice diseases. Rice (Oryza sativa L.), is the most important staple food of Asian countries. Rice production is significantly limited by a diversity of pathogens, leading to yield loss and deficit in current rice supply. Application of agrochemicals of diverse types has been considered as the only option to control pathogens and enhance rice production, thereby causing environmental concerns and making the pathogens resistant to the active ingredients. Increase in population and resistance of pathogen towards agrochemicals put pressure on the agronomists to search for safe, novel, eco-friendly alternative ways to manage rice pathogens. Inducing resistance in rice by using different biotic/abiotic agents provides an environmental friendly alternative way to effectively manage bacterial, fungal, and viral rice pathogens. In recent years, a number of protocols have been developed for inducing pathogen resistance by bio-priming of rice. However, a comprehensive evaluation of the potential of different biotic agents to protect rice crop loss from pathogens is hitherto lacking due to which the research on induction of defense against pathogens in rice is discontinuous. This review deals with the detailed analysis of the bacterial and fungal agents used to induce defense against rice pathogens, their mode of application, mechanism (physiological, biochemical, and molecular) of defense induction, and effect of defense induction on the yield of rice. It also provides an account of gaps in the research and the unexplored areas, which might be taken into consideration to effectively manage rice pathogens.
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Affiliation(s)
| | | | | | - Arup Kumar Mukherjee
- Molecular Plant Pathology Laboratory, Division of Crop Protection, ICAR-National Rice Research Institute, Cuttack, Odisha, 753006, India.
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Syed‐Ab‐Rahman SF, Arkhipov A, Wass TJ, Xiao Y, Carvalhais LC, Schenk PM. Rhizosphere bacteria induce programmed cell death defence genes and signalling in chilli pepper. J Appl Microbiol 2022; 132:3111-3124. [DOI: 10.1111/jam.15456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 07/14/2021] [Accepted: 12/03/2021] [Indexed: 11/28/2022]
Affiliation(s)
- Sharifah Farhana Syed‐Ab‐Rahman
- Plant‐Microbe Interactions Laboratory School of Agriculture and Food Sciences The University of Queensland Brisbane Queensland 4072 Australia
| | - Alexander Arkhipov
- Plant‐Microbe Interactions Laboratory School of Agriculture and Food Sciences The University of Queensland Brisbane Queensland 4072 Australia
| | - Taylor J. Wass
- Plant‐Microbe Interactions Laboratory School of Agriculture and Food Sciences The University of Queensland Brisbane Queensland 4072 Australia
| | - Yawen Xiao
- Plant‐Microbe Interactions Laboratory School of Agriculture and Food Sciences The University of Queensland Brisbane Queensland 4072 Australia
| | - Lilia C. Carvalhais
- Queensland Alliance for Agriculture and Food Innovation The University of Queensland Ecosciences Precinct GPO Box 267 Queensland 4001 Australia
| | - Peer M. Schenk
- Plant‐Microbe Interactions Laboratory School of Agriculture and Food Sciences The University of Queensland Brisbane Queensland 4072 Australia
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Yang CJ, Huang TP, Huang JW. Field Sanitation and Foliar Application of Streptomyces padanus PMS-702 for the Control of Rice Sheath Blight. THE PLANT PATHOLOGY JOURNAL 2021; 37:57-71. [PMID: 33551697 PMCID: PMC7847755 DOI: 10.5423/ppj.oa.12.2020.0227] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 01/06/2021] [Accepted: 01/06/2021] [Indexed: 06/12/2023]
Abstract
Rice sheath blight (ShB), caused by Rhizoctonia solani Kühn AG1-IA, is one of the destructive rice diseases worldwide. The aims of this study were to develop biocontrol strategies focusing on field sanitation and foliar application with a biocontrol agent for ShB management. Streptomyces padanus PMS-702 showed a great antagonistic activity against R. solani. Fungichromin produced by S. padanus PMS-702, at 3.07 mg/l inhibited 50% mycelial growth, caused leakage of cytoplasm, and inhibited the formation of infection structures of R. solani. Fungichromin could reach to 802 mg/l when S. padanus PMS-702 was cultured in MACC broth for 6 days. Addition of 0.5% S. padanus PMS-702 broth into soil decreased the survival rate of the pathogen compared to the control. Soil amended with 0.5% S. padanus broth and 0.5% tea seed pomace resulted in the death of R. solani mycelia in the infested rice straws, and the germination of sclerotia was inhibited 21 days after treatment. Greenhouse trials revealed that S. padanus cultured in soybean meal-glucose (SMGC-2) medium after mixing with different surfactants could enhance its efficacy for inhibiting the pathogen. Of six surfactants tested, the addition of 2% tea saponin was the most effective in suppressing the pathogen. S. padanus broth after being fermented in SMGC-2, mixed with 2% tea saponin, diluted 100 fold, and sprayed onto rice plants significantly reduced ShB disease severity. Thus, S. padanus PMS-702 is an effective biocontrol agent. The efficacy of S. padanus PMS-702 for disease control could be improved through formulation.
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Affiliation(s)
- Chia-Jung Yang
- Department of Plant Pathology, National Chung Hsing University, Taichung 40227, Taiwan
| | - Tzu-Pi Huang
- Department of Plant Pathology, National Chung Hsing University, Taichung 40227, Taiwan
- Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung 407, Taiwan
| | - Jenn-Wen Huang
- Department of Plant Pathology, National Chung Hsing University, Taichung 40227, Taiwan
- Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung 407, Taiwan
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Peng Z, Wang Y, Geng G, Yang R, Yang Z, Yang C, Xu R, Zhang Q, Kakar KU, Li Z, Zhang S. Comparative Analysis of Physiological, Enzymatic, and Transcriptomic Responses Revealed Mechanisms of Salt Tolerance and Recovery in Tritipyrum. FRONTIERS IN PLANT SCIENCE 2021; 12:800081. [PMID: 35069658 PMCID: PMC8766340 DOI: 10.3389/fpls.2021.800081] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 11/30/2021] [Indexed: 05/03/2023]
Abstract
Salt stress results in the severe decline of yield and quality in wheat. In the present study, salt-tolerant Tritipyrum ("Y1805") and salt-sensitive wheat "Chinese Spring" ("CS") were selected from 121 wheat germplasms to test their physiological, antioxidant enzyme, and transcriptomic responses and mechanisms against salt stress and recovery. 56 chromosomes were identified in "Y1805" that comprised A, B, and D chromosomes from wheat parent and E chromosomes from Thinopyrum elongatum, adding to salt-tolerant trait. Salt stress had a greater inhibitory effect on roots than on shoots, and "Y1805" demonstrated stronger salt tolerance than "CS." Compared with "CS," the activities of superoxide dismutase and catalase in "Y1805" significantly increased under salt stress. "Y1805" could synthesize more proline and soluble sugars than "CS." Both the net photosynthetic rate and chlorophyll a/b were affected by salt stress, though the level of damage in "Y1805" was significantly less than in "CS." Transcriptome analysis showed that the differences in the transcriptional regulatory networks of "Y1805" were not only in response to salt stress but also in recovery. The functions of many salt-responsive differentially expressed genes were correlated closely with the pathways "peroxisome," "arginine and proline metabolism," "starch and sucrose metabolism," "chlorophyll and porphyrin metabolism," and "photosynthesis."
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Affiliation(s)
- Ze Peng
- College of Agriculture, Guizhou University, Guiyang, China
- Research Institute of Pepper, Guizhou Academy of Agricultural Sciences, Guiyang, China
| | - Yiqin Wang
- College of Agriculture, Guizhou University, Guiyang, China
| | - Guangdong Geng
- College of Agriculture, Guizhou University, Guiyang, China
| | - Rui Yang
- College of Agriculture, Guizhou University, Guiyang, China
| | - Zhifen Yang
- College of Agriculture, Guizhou University, Guiyang, China
| | - Chunmiao Yang
- College of Agriculture, Guizhou University, Guiyang, China
| | - Ruhong Xu
- College of Agriculture, Guizhou University, Guiyang, China
- Guizhou Subcenter of National Wheat Improvement Center, Guiyang, China
| | - Qingqin Zhang
- College of Agriculture, Guizhou University, Guiyang, China
| | - Kaleem U. Kakar
- Department of Microbiology, Faculty of Life Sciences and Informatics, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, Pakistan
| | - Zhenhua Li
- College of Agriculture, Guizhou University, Guiyang, China
- Guizhou Subcenter of National Wheat Improvement Center, Guiyang, China
- *Correspondence: Zhenhua Li,
| | - Suqin Zhang
- College of Agriculture, Guizhou University, Guiyang, China
- Guizhou Subcenter of National Wheat Improvement Center, Guiyang, China
- Suqin Zhang,
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Cell-Free Supernatants of Plant Growth-Promoting Bacteria: A Review of Their Use as Biostimulant and Microbial Biocontrol Agents in Sustainable Agriculture. SUSTAINABILITY 2020. [DOI: 10.3390/su12239917] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Plant growth-promoting bacteria (PGPB) afford plants several advantages (i.e., improvement of nutrient acquisition, growth, and development; induction of abiotic and biotic stress tolerance). Numerous PGPB strains have been isolated and studied over the years. However, only a few of them are available on the market, mainly due to the failed bacterial survival within the formulations and after application inside agroecosystems. PGPB strains with these challenging limitations can be used for the formulation of cell-free supernatants (CFSs), broth cultures processed through several mechanical and physical processes for cell removal. In the scientific literature there are diverse reviews and updates on PGPB in agriculture. However, no review deals with CFSs and the CFS metabolites obtainable by PGPB. The main objective of this review is to provide useful information for future research on CFSs as biostimulant and biocontrol agents in sustainable agriculture. Studies on CFS agricultural applications, both for biostimulant and biocontrol applications, have been reviewed, presenting limitations and advantages. Among the 109 articles selected and examined, the Bacillus genus seems to be the most promising due to the numerous articles that support its biostimulant and biocontrol potentialities. The present review underlines that research about this topic needs to be encouraged; evidence so far obtained has demonstrated that PGPB could be a valid source of secondary metabolites useful in sustainable agriculture.
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Rangjaroen C, Lumyong S, Sloan WT, Sungthong R. Herbicide-tolerant endophytic bacteria of rice plants as the biopriming agents for fertility recovery and disease suppression of unhealthy rice seeds. BMC PLANT BIOLOGY 2019; 19:580. [PMID: 31870307 PMCID: PMC6929507 DOI: 10.1186/s12870-019-2206-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 12/17/2019] [Indexed: 05/23/2023]
Abstract
BACKGROUND Dirty panicle disease (DPD) caused by several fungal phytopathogens results in damage and depreciation of rice seeds. Unhealthy rice seeds with DPD are potent reservoirs of pathogens and unable to be used as seed stock as they can spread the disease in the paddy fields leading to the severe loss of rice yield and quality. In this study, we aim to search for beneficial endophytes of commercially cultivated rice plants and utilize them as biostimulants in seed biopriming for fertility recovery and disease suppression of unhealthy rice seeds. RESULTS Forty-three bacterial endophytes were isolated from rice plants grown in the herbicide-treated paddy fields. Five isolates of these endophytes belonging to the genus Bacillus show excellent antifungal activity against fungal pathogens of DPD. Based on germination tests, biopriming unhealthy rice seeds by soaking in bacterial suspensions for 9 or 12 h was optimal as evidenced by the lowest disease incidence and longer shoot and root lengths of seedlings germinated, compared with controls made of non-treated or hydroprimed healthy and unhealthy seeds. Pot experiments were carried out to evaluate the impact of seed biopriming, in which the percentage of healthy rice yield produced by rice plants emerging from bioprimed seeds was not significantly different, compared to the controls originating respectively from non-treated healthy seeds and chemical fungicide-treated unhealthy seeds. CONCLUSION Biopriming of unhealthy rice seeds with herbicide-tolerant endophytic bacteria could recover seed fertility and protect the full life cycle of emerging rice plants from fungal pests. With our findings, seed biopriming is a straightforward approach that farmers can apply to recover unhealthy rice seed stock, which enables them to reduce the cost and use of agrochemicals in the commercial production of rice and to promote green technology in sustainable agriculture.
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Affiliation(s)
- Chakrapong Rangjaroen
- Department of Agricultural Management Technology, Faculty of Science and Technology, Phranakhon Rajabhat University, Bangkok, 10220 Thailand
| | - Saisamorn Lumyong
- Microbiology Division, Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, 50200 Thailand
- Center of Excellence in Microbial Diversity and Sustainable Utilization, Chiang Mai University, Chiang Mai, 50200 Thailand
- Academy of Science, The Royal Society of Thailand, Bangkok, 10300 Thailand
| | - William T. Sloan
- Infrastructure and Environment Research Division, School of Engineering, University of Glasgow, Glasgow, G12 8LT UK
| | - Rungroch Sungthong
- Infrastructure and Environment Research Division, School of Engineering, University of Glasgow, Glasgow, G12 8LT UK
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Gong AD, Wu NN, Kong XW, Zhang YM, Hu MJ, Gong SJ, Dong FY, Wang JH, Zhao ZY, Liao YC. Inhibitory Effect of Volatiles Emitted From Alcaligenes faecalis N1-4 on Aspergillus flavus and Aflatoxins in Storage. Front Microbiol 2019; 10:1419. [PMID: 31293550 PMCID: PMC6603156 DOI: 10.3389/fmicb.2019.01419] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 06/05/2019] [Indexed: 11/28/2022] Open
Abstract
Controlling aflatoxigenic Aspergillus flavus and aflatoxins (AFs) in grains and food during storage is a great challenge to humans worldwide. Alcaligenes faecalis N1-4 isolated from tea rhizosphere soil can produce abundant antifungal volatiles, and greatly inhibited the growth of A. flavus in un-contacted face-to-face dual culture testing. Gas chromatography tandem mass spectrometry revealed that dimethyl disulfide (DMDS) and methyl isovalerate (MI) were two abundant compounds in the volatile profiles of N1-4. DMDS was found to have the highest relative abundance (69.90%, to the total peak area) in N1-4, which prevented the conidia germination and mycelial growth of A. flavus at 50 and 100 μL/L, respectively. The effective concentration for MI against A. flavus is 200 μL/L. Additionally, Real-time quantitative PCR analysis proved that the expression of 12 important genes in aflatoxin biosynthesis pathway was reduced by these volatiles, and eight genes were down regulated by 4.39 to 32.25-folds compared to control treatment with significant differences. And the A. flavus infection and AFs contamination in groundnut, maize, rice and soybean of high water activity were completely inhibited by volatiles from N1-4 in storage. Scanning electron microscope further proved that A. flavus conidia inoculated on peanuts surface were severely damaged by volatiles from N1-4. Furthermore, strain N1-4 showed broad and antifungal activity to other six important plant pathogens including Fusarium graminearum, F. equiseti, Alternaria alternata, Botrytis cinerea, Aspergillus niger, and Colletotrichum graminicola. Thus, A. faecalis N1-4 and volatile DMDS and MI may have potential to be used as biocontrol agents to control A. flavus and AFs during storage.
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Affiliation(s)
- An-Dong Gong
- Henan Key Laboratory of Tea Plant Biology, College of Life Sciences, Xinyang Normal University, Xinyang, China
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Nan-Nan Wu
- Henan Key Laboratory of Tea Plant Biology, College of Life Sciences, Xinyang Normal University, Xinyang, China
| | - Xian-Wei Kong
- Henan Key Laboratory of Tea Plant Biology, College of Life Sciences, Xinyang Normal University, Xinyang, China
| | - Yi-Mei Zhang
- Henan Key Laboratory of Tea Plant Biology, College of Life Sciences, Xinyang Normal University, Xinyang, China
| | - Meng-Jun Hu
- Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD, United States
| | - Shuang-Jun Gong
- Institute of Plant Protection and Soil Science, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Fei-Yan Dong
- Henan Key Laboratory of Tea Plant Biology, College of Life Sciences, Xinyang Normal University, Xinyang, China
| | - Jian-Hua Wang
- Institute for Agri-Food Standards and Testing Technology, Laboratory of Quality & Safety Risk Assessment for Agro-Products (Shanghai), Ministry of Agriculture, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Zhi-Yong Zhao
- Institute for Agri-Food Standards and Testing Technology, Laboratory of Quality & Safety Risk Assessment for Agro-Products (Shanghai), Ministry of Agriculture, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Yu-Cai Liao
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
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