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Validamycin A Induced Resistance in Rice against <i>Rhizoctonia solani</i> via the Salicylic Acid-Depended Signaling Pathway

Ge-Ning SongNational Joint Local Engineering Laboratory for High-Efficient Preparation of Biopesticide, College of Forestry and BiotechnologyHao HanNational Joint Local Engineering Laboratory for High-Efficient Preparation of Biopesticide, College of Forestry and BiotechnologyYu-Ting MaNational Joint Local Engineering Laboratory for High-Efficient Preparation of Biopesticide, College of Forestry and BiotechnologyLuyao LiuNational Joint Local Engineering Laboratory for High-Efficient Preparation of Biopesticide, College of Forestry and BiotechnologyKe-Yan YaoNational Joint Local Engineering Laboratory for High-Efficient Preparation of Biopesticide, College of Forestry and BiotechnologyChen-Shun XieNational Joint Local Engineering Laboratory for High-Efficient Preparation of Biopesticide, College of Forestry and BiotechnologyYu-Nuo WuNational Joint Local Engineering Laboratory for High-Efficient Preparation of Biopesticide, College of Forestry and BiotechnologyJie ChenNational Joint Local Engineering Laboratory for High-Efficient Preparation of Biopesticide, College of Forestry and BiotechnologyJing JinNational Joint Local Engineering Laboratory for High-Efficient Preparation of Biopesticide, College of Forestry and Biotechnology

Journal of Agricultural and Food Chemistryjournal2026en

ABI

Annotatsiya

Validamycin A (VMA), the major active component of validamycin, provides effective control of rice sheath blight; however, the mechanisms underlying VMA-induced resistance to Rhizoctonia solani remain poorly understood. Here, we integrated antioxidant enzyme assays, phytohormone profiling, transcriptomics, and metabolomics to investigate VMA-induced immunity in rice. VMA improved oxidative stress tolerance by enhancing antioxidant enzyme activities and activating glutathione metabolism. Moreover, VMA established a primed multihormonal state characterized by elevated salicylic acid (SA), jasmonic acid (JA) levels, while disease resistance was specifically governed by the SA signaling pathway. Functional analyses of SA-deficient mutants (pal1, pal2, and pr1a) indicated that VMA-mediated immunity is primarily dependent on SA-associated defense. BR appeared to contribute to response tuning, and JA-associated changes suggested possible hormone crosstalk. These findings clarify the mechanism of VMA-induced resistance and expand understanding of chemical elicitor-mediated immunity against necrotrophic pathogens in rice.

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Mavzular

Plant-Microbe Interactions and Immunity Plant Disease Resistance and Genetics Fungal and yeast genetics research

Identifikatorlar

DOI: 10.1021/acs.jafc.5c16246

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