OsOAT

| Categories genes  | Tags oxidative  transcription factor  growth  drought  phytohormone  nitrogen  anther  development  seed  seedlings  plant development  fertility  stress  domestication  tolerance  cold tolerance  cold stress  cold  floral  reproductive  breeding  sterile  floral organ  male fertility  seed-setting 
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  • Key message
    • In addition, OsOAT-overexpressing plants showed significantly increased tolerance to oxidative stress
    • An ornithine delta-aminotransferase gene OsOAT confers drought and oxidative stress tolerance in rice
    • We confirmed that OsOAT is a direct target of the stress-responsive NAC transcription factor SNAC2
    • Overexpression of OsOAT caused significantly increased delta-OAT activity and Pro accumulation under normal growth conditions
    • Both ABA-dependent and ABA-independent pathways contributed to the drought-induced expression of OsOAT
    • Overexpression of the OsOAT gene in rice resulted in significantly enhanced drought and osmotic stress tolerance
    • OsOAT is responsive to multiple stresses and phytohormone treatments
    • In the Osoat mutant, metabolic abnormality induced by nitrogen deficiency in floret causes malformed glumes, incapable glume opening and anther indehiscence
    • Therefore, OsOAT is crucial for nitrogen reutilization and plays a critical role in floret development and seed setting in rice
    • osoat mutant was identified as a temperature-sensitive male sterile mutant with deformed floral organs and seedlings sensitive to cold stress
    • Ornithine 未-aminotransferase OsOAT is critical for male fertility and cold tolerance during rice plant development.
    • Moreover, indica varieties carrying WYG-type OsOAT generally have higher seed-setting rates than those carrying HHZ-type OsOAT under cold stress at reproductive stage, highlighting the favorable selection for WYG-type OsOAT during domestication and breeding to cope with low temperatures
    • Comparative transcriptome analysis showed that OsOAT mutation and cold treatment of the wild-type plant led to similar changes in the global gene expression profiles in anthers
    • OsOAT genes in indica rice Huanghuazhan (HHZ) and japonica rice Wuyungeng (WYG) are different in gene structure and response to cold
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