Mechanism of delayed seed germination caused by high temperature during grain filling in rice (Oryza sativa L.).

ABSTRACT: High temperature during grain filling considerably reduces yield and quality in rice (Oryza sativa L.); however, how high temperature affects seed germination of the next generation is not yet well understood. Here, we report that seeds from plants exposed to high temperature during the grain filling stage germinated significantly later than seeds from unstressed plants. This delay remained even after dormancy release treatments, suggesting that it was not due to primary seed dormancy determined during grain filling. In imbibed embryos of heat-stressed seeds, expression of abscisic acid (ABA) biosynthesis genes (OsNCEDs) was higher than in those of control seeds, whereas that of ABA catabolism genes (OsABA8'OHs) was lower. In the aleurone layer, despite no change in GA signaling as evidenc

SUBMITTER: Suriyasak C 

PROVIDER: S-EPMC7562956 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature