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Author Xie W., Xue X., Wang Y., Zhang G., Zhao J., Zhang H., Wang G., Li L., Wang Y., Shan W., Zhang Y., Chen Z., Chen X., Feng Z., Hu K., Sun M., Chu C., Zuo S.
Title Natural mutation in stay-green (OsSGR) confers enhanced resistance to rice sheath blight through elevating cytokinin content.
Abstract:
Sheath blight (ShB), caused by Rhizoctonia solani, is a highly destructive disease in many crops worldwide and no major resistance genes are available. Here, we identified a sbr1 (sheath blight resistance 1) rice mutant, which shows enhanced ShB resistance and maintains wildtype agronomic traits including yield, but carries an undesired stay-green phenotype. Through map-based cloning and transgenic validation, we found that an insertion disrupting the stay-green (OsSGR) gene is responsible for sbr1 phenotypes. Mechanistically, the sbr1/OsSGR mutants reduce the expression of most OsCKX genes, which function in cytokinin (CK) degradation, to accumulate CK leading to ShB resistance. Importantly, knockout of OsCKX7, predominantly expressed in the leaf sheath and highly induced by R. solani, significantly enhances ShB resistance without stay-green phenotype nor yield penalty, showing high application potential. Thus, our study reveals novel insights that OsSGR and cytokinin play key roles in rice-R. solani interaction and generates a valuable ShB-resistant germplasm.
Journal Plant Biotechnol. J.
Country China
Volume 23(3)
Pages 807-823
Year 2025
PubMed ID 39630094
PubMed Central ID 11869175
DOI 10.1111/pbi.14540
URL -
Relation
Gene CKX7 SGR
INSD -
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain 		-
Stages in Each Organ
- Muant Lines (Gene) 		-
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
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