| Categories genes  | Tags flower  iaa  tiller  leaf  gravitropic response  root  shoot  panicle  architecture  homeostasis  height  plant height  IAA  plant architecture  shoot architecture 
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  • Key message
    • The OsIAGLU gene driven by the Cauliflower Mosaic Virus 35S promoter was transformed into a rice cultivar to generate transgenic rice plants constitutively over-expressing this gene
    • To decrease IAA levels, we selected the rice IAA-glucose synthase gene (OsIAGLU) from the rice genome database based on high sequence homology with IAA-glucose synthase from maize (ZmIAGLU), which is known to generate IAAglucose conjugate from free IAA
    • Tiller formation in rice is altered by overexpression of OsIAGLU gene encoding an IAA-conjugating enzyme or exogenous treatment of free IAA
    • The number of tillers and leaf angle was significantly increased with a concomitant decrease in plant height and panicle length in the transgenic rice lines overexpressing OsIAAGLU compared to the wild-type (WT) plants
    • Furthermore, overexpression of OsIAAGLU resulted in reduced sensitivity to IAA/NAA and altered gravitropic response of the roots in the transgenic plants
    • Overexpression of OsIAAGLU in rice resulted in altered rice shoot architecture and root gravitropism
    • These results support that OsIAAGLU could play a regulatory role in IAA homeostasis and rice architecture
    • OsIAAGLU could catalyze the reaction of IAA with glucose to generate IAA-glucose
    • Expression of OsIAAGLU could be induced by IAA and NAA
    • Overexpression of OsIAAGLU reveals a role for IAA-glucose conjugation in modulating rice plant architecture.
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