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Summary  Seed vigour is an important trait for direct seeding in rice. In this study, indole‐3‐acetate beta‐glucosyltransferase  OsIAGLU  was cloned in rice, and its roles on seed vigour were mainly investigated. Disruption of  OsIAGLU  resulted in low seed vigour in rice. Quantitative RT‐PCR analysis showed that the expressions of  OsIAGLU  were relatively higher in the late developing and the early germinating seeds and were significantly induced by indole‐3‐acetic acid (IAA) and abscisic acid (ABA). Transcriptome analysis revealed that the IAA‐ and ABA‐related genes were involved in the  OsIAGLU  regulation of seed vigour in rice. The higher levels of free IAA and ABA were identified in germinating seeds of  osiaglu  mutants compared to wild‐type (WT) plants. When treated with exogenous IAA and ABA, the  osiaglu  mutants and WT plants showed sensitivity to ABA while not IAA, but the exogenous IAA amplified ABA‐induced reduction of seed vigour in rice. The continuously higher expressions of  ABA‐INSENSITIVE 3  ( OsABI3 ) and  OsABI5  occurred in germinating seeds of  osiaglu  mutants compared to WT plants. The regulation of seed vigour by  OsIAGLU  might be through modulating IAA and ABA levels to alert  OsABIs  expression in germinating seeds in rice. Based on analysis of single‐nucleotide polymorphism data of rice accessions, two haplotypes of  OsIAGLU  that positively correlated with seed vigour were identified in  indica  accessions. This study provides important insights into the roles of  OsIAGLU  on seed vigour and facilitates the practical use of  OsIAGLU  in rice breeding.

Indole‐3‐acetate beta‐glucosyltransferase OsIAGLU regulates seed vigour through mediating crosstalk between auxin and abscisic acid in rice