| Categories genes  | Tags fertility  panicle  spikelet  grain  seedling  seed  drought  seed germination  tolerance  grain yield  ABA  drought tolerance  stress  floral  spikelet number  plant growth  floral organ  ABA  drought stress  drought stress  seedling growth  ABA biosynthesis 
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  • Key message
    • Mutation and overexpression of OsAO3 increased and decreased grain yield, respectively, by affecting panicle number per plant, spikelet number per panicle, and spikelet fertility
    • The rice aldehyde oxidase OsAO3 gene regulates plant growth, grain yield, and drought tolerance by participating in ABA biosynthesis.
    • Thus, OsAO3 may participate in ABA biosynthesis, and is essential for regulation of seed germination, seedling growth, grain yield, and drought tolerance in rice
    • Mutation and overexpression of OsAO3 decreased and increased ABA levels, respectively, in seedling shoots and roots under both normal and drought stress conditions
    • The osao3 mutant exhibited earlier seed germination, increased seedling growth, and decreased drought tolerance compared to the wild-type, OsAO3-overexpressing lines exhibited the opposite phenotype
    • OsAO3 was expressed in germinated seeds, roots, leaves, and floral organs, particularly in vascular tissues and guard cells, and its expression was significantly induced by exogenous ABA and mannitol
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