| Categories genes  | Tags grain width  grain size  grain  yield  abscisic acid 
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  • Key message
    • We showed that the quantitative trait locus (QTL) GS5 in rice controls grain size by regulating grain width, filling and weight
    • GS5 encodes a putative serine carboxypeptidase and functions as a positive regulator of grain size, such that higher expression of GS5 is correlated with larger grain size
    • The results suggest that natural variation in GS5 contributes to grain size diversity in rice and may be useful in improving yield in rice and, potentially, other crops(2)
    • Natural variation in GS5 plays an important role in regulating grain size and yield in rice
    • Differential expression of GS5 regulates grain size in rice.
    • GS5 is a positive regulator of grain size such that grain width, filling, and weight are correlated with its expression level
    • Previous work suggested that polymorphisms of GS5 in the promoter region might be responsible for the variation in grain size
    • Enhanced expression of GS5 competitively inhibits the interaction between OsBAK1-7 and OsMSBP1 by occupying the extracellular leucine-rich repeat (LRR) domain of OsBAK1-7, thus preventing OsBAK1-7 from endocytosis caused by interacting with OsMSBP1, providing an explanation for the positive association between grain size and GS5 expression
    • These results advanced our understanding of the molecular mechanism by which GS5 controls grain size
    • These two polymorphs altered the responses of the GS5 alleles to abscisic acid (ABA) treatments, resulting in higher expression of GS5-1 than of GS5-2 in developing young panicles
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