OsAO3

• Symbol: OsAO3
• MSU: LOC_Os07g18120
• RAPdb: Os07g0281700

• The rice aldehyde oxidase OsAO3 gene regulates plant growth, grain yield, and drought tolerance by participating in ABA biosynthesis., 2021, Biochem Biophys Res Commun.

Genbank accession number

• 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

• OsAO3, OsAO4, Co-evolved ascorbate oxidases of plant and the blast fungus orchestrate host apoplast redox state to modulate rice immunity., We showed that MoAo1 inhibits host ascorbate oxidases OsAO3 and OsAO4, which also regulate apoplast redox status and host immunity
• OsAO3, OsAO4, Co-evolved ascorbate oxidases of plant and the blast fungus orchestrate host apoplast redox state to modulate rice immunity., In addition, we found that MoAo1, OsAO3, and OsAO4 all undergo polymorphic variations whose varied interactions orchestrate pathogen virulence and rice immunity
• OsAO3, OsERF106MZ, Overexpression of OsERF106MZ promotes parental root growth in rice seedlings by relieving the ABA-mediated inhibition of root growth under salinity stress conditions., Furthermore, chromatin immunoprecipitation (ChIP)-qPCR and luciferase (LUC) reporter assays showed that OsERF106MZ can bind directly to the sequence containing the GCC box in the promoter region of the OsAO3 gene and repress the expression of OsAO3
• OsAO3, OsNPC3, Overexpression of OsERF106MZ promotes parental root growth in rice seedlings by relieving the ABA-mediated inhibition of root growth under salinity stress conditions., The expression of the ABA biosynthetic gene OsAO3 is downregulated in OsERF106MZ-overexpressing roots under normal conditions, while the expression of OsNPC3, an AtNPC4 homolog involved in ABA sensitivity, is reduced in OsERF106MZ-overexpressing roots under both normal and NaCl-treated conditions