Roles of the Arabidopsis G protein. subunit AGG3 and its rice homologs GS3 and DEP1 in seed and organ size control
Roles of the Arabidopsis G protein. subunit AGG3 and its rice homologs GS3 and DEP1 in seed and organ size control
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DOI：
10.4161/psb.21620
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发表时间：
2012-01-01
影响因子：
2.9
通讯作者：
Li, Yunhai
中科院分区：
文献类型：
--
作者：
Li, Shengjun;Liu, Wuxia;Li, Yunhai
种子和器官的大小由细胞增殖和细胞扩张协调决定，但植物中决定最终种子和器官大小的机制在很大程度上是未知的。在最近的一项研究中，我们证明植物特异性 G 蛋白 γ 亚基 (AGG3) 通过延长拟南芥的增殖生长周期来促进种子和器官生长。 AGG3 定位于质膜并与 G 蛋白 β 亚基 (AGB1) 相互作用。水稻中 AGG3 的同源物（GS3 和 DEP1/qPE9-1）已被确定为影响种子大小和产量的重要数量性状基因座。然而，水稻 GS3 和 DEP1 通过限制细胞增殖来影响种子和器官的生长。在这里，我们讨论了拟南芥 AGG3 及其水稻同源物 GS3 和 DEP1 控制种子和器官大小的可能分子机制。
The size of seeds and organs is coordinately determined by cell proliferation and cell expansion, but the mechanisms that set final seed and organ size are largely unknown in plants. In a recent study, we have demonstrated that the plant specific G protein gamma subunit (AGG3) promotes seed and organ growth by increasing the period of proliferative growth in Arabidopsis. AGG3 is localized in plasma membrane and interacts with the G protein beta subunit (AGB1). Homologs of AGG3 in rice (GS3 and DEP1/qPE9-1) have been identified as important quantitative trait loci for seed size and yield. However, rice GS3 and DEP1 influence seed and organ growth by restricting cell proliferation. Here, we discuss the possible molecular mechanisms by which Arabidopsis AGG3 and its rice homologs GS3 and DEP1 control seed and organ size.