Function of in , an Allele of , in Seed Development and Stress Response.

Abscisic acid (ABA) has been implicated in plant adaptation to various environmental stresses in addition to the regulation of seed dormancy and leaf senescence. ABI3 is a B3 domain-containing family protein and functions in the ABA signaling pathway during seed development. To date, the ABI3 orthologous have not been studied in . The aim of this study is to investigate the function of in plant development and stress response. Here, we identified an line () from a population of mutagenized seeds and showed that GS1 is a new allele of . When the mutant was transformed with the gene, the transformed plants produced seeds that turned yellow and acquired desiccation tolerance. Moreover, regulates seed coat development and mucilage secretion by directly targeting the and genes. In addition, we showed that expression rescued freezing-induced green seed coloration by targeting in transgenic . is also involved in lateral root development and conferred a novel interaction between ABA and auxin signaling in roots. The potential role of protein in endoplasmic reticulum homoeostasis was also tested. Altogether, our results indicated that mediates both plant development and the stress response.