期刊
PLANT AND CELL PHYSIOLOGY
卷 59, 期 2, 页码 343-354出版社
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcx186
关键词
Arabidopsis; AtIPK2 beta; Glucose; IP6; Seed germination; SnRK1
资金
- National Natural Science Foundation of China [31271319, 31170270]
Seed germination and subsequent seedling development are critical phases in plants. These processes are regulated by a complex molecular network in which sugar has been reported to play an essential role. However, factors affecting sugar responses remain to be fully elucidated. In this study, we demonstrate that AtIPK2 beta, known to participate in the synthesis of myo-inositol 1,2,3,4,5,6-hexakisphosphate (IP6, phytate), affects Arabidopsis responses to glucose during seed germination. The loss-of-function mutant atipk2 beta showed increased sensitivity to 6% glucose and paclobutrazol (PAC). Yeast two-hybrid assay showed that AtIPK2 beta interacts with sucrose non-fermenting-1-related protein kinase (SnRK1.1), and bimolecular fluorescence complementation (BiFC) and pull-down assay further confirmed this interaction. Moreover, AtIPK2 beta was phosphorylated by SnRK1.1 in vitro, and the effect of restoring AtIPK2 beta to yeast cells lacking IPK2 (Delta ipk2) was abolished by catalytically active SnRK1.1. Further analysis indicated that IP6 reduces the suppression of seed germination caused by glucose, accompanied by altered expression levels of glucose-/hormone-responsive genes. Collectively, these findings indicate that AtIPK2 beta and IP6 are involved in glucose suppression of seed germination and that AtIPK2 beta enzyme activity is likely to be regulated by SnRK1.1.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据