日本植物生理学会年会およびシンポジウム 講演要旨集
第52回日本植物生理学会年会要旨集
会議情報

Regulation of Seed dormancy by a member of PP2C
*Choi Giltsu
著者情報
会議録・要旨集 フリー

p. S0022

詳細
抄録
Seed dormancy is a poorly understood process. To identify molecular components that regulate seed dormancy, we screened T-DNA insertion lines and identified a mutant designated honsu (hon). HON loss-of-function mutants display deep seed dormancy, whereas HON-overexpressing lines display shallow seed dormancy. HON encodes a seed-specific group A phosphatase 2C (PP2C) and is the major negative regulator of seed dormancy among group A PP2Cs. Like other PP2C family members, HON interacts with PYR1/RCAR11 in the presence of abscisic acid (ABA). Our analysis indicates that HON inhibits ABA signaling and activates gibberellin (GA) signaling, and both of these conditions must be satisfied to promote the release of seed dormancy. However, activation of GA signaling by HON is an indirect effect attributable to weakened ABA signaling. HON mRNA levels are increased in mutants displaying shallow seed dormancy or under conditions that promote the release of seed dormancy, and decreased in mutants displaying deep seed dormancy or under conditions that deepen seed dormancy. Taken together, our results indicate that seeds homeostatically regulate dormancy by adjusting the level of HON.
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