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Soluble Sugar Accumulation Can Influence Seed Size via AN3-YDA Gene Cascade.
Journal of Agricultural and Food Chemistry 2017 May 25
In higher plants, seed size is central to many aspects in evolutionary fitness and is a crucial agricultural trait. In this study, Arabidopsis an3 (angustifolia3) mutants present with increased seed size. Target-gene analysis revealed that YDA, which encodes a mitogen-activated protein kinase kinase kinase, is a target gene of AN3. Indeed, the loss of YDA function decreases seed size. Furthermore, AN3 and YDA mutations both disrupt normal sucrose and glucose contents and cause altered seed size in an3 or yda mutants. With these results, we provide a molecular model in which soluble sugar accumulation might affect seed size regulation via the AN3-YDA gene cascade. Our findings guide the synthesis of a model that predicts the integration of soluble sugar accumulation at AN3 to control the establishment of seed size.
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