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Schulman P, Ribeiro THC, Fokar M, Chalfun-Junior A, Lally RD, Paré PW, de Medeiros FHV. A Microbial Fermentation Product Induces Defense-Related Transcriptional Changes and the Accumulation of Phenolic Compounds in Glycine max. PHYTOPATHOLOGY 2022; 112:862-871. [PMID: 34622696 DOI: 10.1094/phyto-06-21-0227-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: 06/13/2023]
Abstract
With the progressive loss of fungicide efficacy against Phakopsora pachyrhizi, the causal agent of Asian soybean rust (ASR), alternative methods to protect soybean crops are needed. Resistance induction is a low impact alternative and/or supplement to fungicide applications that fortifies innate plant defenses against pathogens. Here, we show that a microbial fermentation product (MFP) induces plant defenses in soybean, and transcriptional induction is enhanced with the introduction of ASR. MFP-treated plants exhibited 1,011 and 1,877 differentially expressed genes (DEGs) 12 and 60 h after treatment, respectively, compared with water controls. MFP plants exposed to the pathogen 48 h after application and sampled 12 h later (for a total of 60 h) had 2,401 DEGs compared with control. The plant defense genes PR1, PR2, IPER, PAL, and CHS were induced with MFP application, and induction was enhanced with ASR. Enriched pathways associated with pathogen defense included plant-pathogen interactions, MAPK signaling pathways, phenylpropanoid biosynthesis, glutathione metabolism, flavonoid metabolism, and isoflavonoid metabolism. In field conditions, elevated antioxidant peroxidase activities and phenolic accumulation were measured with MFP treatment; however, improved ASR control or enhanced crop yield were not observed. MFP elicitation differences between field and laboratory grown plants necessitates further testing to identify best practices for effective disease management with MFP-treated soybean.
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Affiliation(s)
- Pablo Schulman
- Empresa de Assistência Técnica e Extensão Rural do Estado Minas Gerais, Belo Horizonte, Minas Gerais 30441-194, Brazil
| | - Thales H C Ribeiro
- Departamento de Biologia, Faculdade de Ciências Naturais, Universidade Federal de Lavras, Lavras, Minas Gerais 37200-900, Brazil
| | - Mohamed Fokar
- Center for Biotechnology & Genomics, Texas Tech University, Lubbock, TX 79409, U.S.A
| | - Antonio Chalfun-Junior
- Departamento de Biologia, Faculdade de Ciências Naturais, Universidade Federal de Lavras, Lavras, Minas Gerais 37200-900, Brazil
| | | | - Paul W Paré
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409, U.S.A
| | - Flávio H V de Medeiros
- Departamento de Fitopatologia, Escola de Ciências Agrárias, Universidade Federal de Lavras, Lavras, Minas Gerais 37200-900, Brazil
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Schneider JR, Müller M, Klein VA, Rossato-Grando LG, Barcelos RP, Dalmago GA, Chavarria G. Soybean Plant Metabolism under Water Deficit and Xenobiotic and Antioxidant Agent Application. BIOLOGY 2020; 9:E266. [PMID: 32899122 PMCID: PMC7565094 DOI: 10.3390/biology9090266] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 08/24/2020] [Accepted: 08/31/2020] [Indexed: 11/18/2022]
Abstract
The aim was to evaluate the interactive effects on biochemistry and physiology of soybean plants exposed to simultaneous xenobiotic and water deficit stresses, and the possible attenuation of plant damage by an antioxidant agent. Soybean plants were submitted to eight different soil water potentials, in two experiments (first experiment: -0.96, -0.38, -0.07, -0.02 MPa, and second experiment: -3.09, -1.38, -0.69, -0.14 MPa), xenobiotic, and antioxidant agent applications. Was observed a reduction in water status, gas exchange, photosynthetic pigments, photosystem II quantum yield, and increased leaf temperature in plants under low water availability. Water deficit also induced oxidative stress by the increased production of reactive oxygen species, cellular and molecular damage, and induction of the antioxidant defense metabolism, reduction of gas exchange, water status, and photosynthetic efficiency. The xenobiotic application also caused changes, with deleterious effects more pronounced in low soil water availability, mainly the reactive oxygen species production, consequently the antioxidant activity, and the oxidative damages. This indicates different responses to the combination of stresses. Antioxidant enzyme activity was reduced by the application of the antioxidant agent. Principal Component Analysis showed a relation with the antioxidant agent and reactive oxygen species, which is probably due to signaling function, and with defense antioxidant system, mainly glutathione, represented by thiols.
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Affiliation(s)
- Julia Renata Schneider
- Plant Physiology Laboratory, Agronomy Post-Graduate Program, Faculty of Agronomy and Veterinary Medicine, Passo Fundo University, BR 285, Passo Fundo 99052-900, Rio Grande do Sul, Brazil; (J.R.S.); (M.M.)
| | - Mariele Müller
- Plant Physiology Laboratory, Agronomy Post-Graduate Program, Faculty of Agronomy and Veterinary Medicine, Passo Fundo University, BR 285, Passo Fundo 99052-900, Rio Grande do Sul, Brazil; (J.R.S.); (M.M.)
| | - Vilson Antonio Klein
- Soil Physics Laboratory, Agronomy Post-Graduate Programa, Faculty of Agronomy and Veterinary Medicine, Passo Fundo University, BR 285, Passo Fundo 99052-900, Rio Grande do Sul, Brazil;
| | - Luciana Grazziotin Rossato-Grando
- Faculty of Pharmacy, Institute of Biological Sciences, Bioexperimentation Post-Graduate Program, Passo Fundo University, BR 285, Passo Fundo 99052-900, Rio Grande do Sul, Brazil; (L.G.R.-G.); (R.P.B.)
| | - Rômulo Pillon Barcelos
- Faculty of Pharmacy, Institute of Biological Sciences, Bioexperimentation Post-Graduate Program, Passo Fundo University, BR 285, Passo Fundo 99052-900, Rio Grande do Sul, Brazil; (L.G.R.-G.); (R.P.B.)
| | - Genei Antonio Dalmago
- Sustainable Production Systems, Ecophysiology, Embrapa Wheat, Rodovia BR 285, Km 294, Passo Fundo 99050-970, Rio Grande do Sul, Brazil;
| | - Geraldo Chavarria
- Plant Physiology Laboratory, Agronomy Post-Graduate Program, Faculty of Agronomy and Veterinary Medicine, Passo Fundo University, BR 285, Passo Fundo 99052-900, Rio Grande do Sul, Brazil; (J.R.S.); (M.M.)
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