Yu Xiang-Chun, Zhu Sai-Yong, Gao Gui-Feng, Wang Xiao-Jing, Zhao Rui, Zou Ke-Qin, Wang Xiao-Fang, Zhang Xiao-Yan, Wu Fu-Qing, Peng Chang-Cao, Zhang Da-Peng
China State Key Laboratory of Plant Physiology and Biochemistry, China Agricultural University, 100094, Beijing, China.
Plant Mol Biol. 2007 Jul;64(5):531-8. doi: 10.1007/s11103-007-9172-9. Epub 2007 May 3.
Calcium is an important second messenger involved in abscisic acid (ABA) signal transduction. Calcium-dependent protein kinases (CDPKs) are the best characterized calcium sensor in plants and are believed to be important components in plant hormone signaling. However, in planta genetic evidence has been lacking to link CDPK with ABA-regulated biological functions. We previously identified an ABA-stimulated CDPK from grape berry, which is potentially involved in ABA signaling. Here we report that heterologous overexpression of ACPK1 in Arabidopsis promotes significantly plant growth and enhances ABA-sensitivity in seed germination, early seedling growth and stomatal movement, providing evidence that ACPK1 is involved in ABA signal transduction as a positive regulator, and suggesting that the ACPK1 gene may be potentially used for elevating plant biomass production.
钙是参与脱落酸（ABA）信号转导的重要第二信使。钙依赖蛋白激酶（CDPKs）是植物中特征最明确的钙传感器，被认为是植物激素信号传导的重要组成部分。然而，在植物体内一直缺乏将CDPK与ABA调节的生物学功能联系起来的遗传证据。我们之前从葡萄浆果中鉴定出一种受ABA刺激的CDPK，它可能参与ABA信号传导。在此我们报告，在拟南芥中异源过表达ACPK1可显著促进植物生长，并增强种子萌发、幼苗早期生长和气孔运动中的ABA敏感性，这证明ACPK1作为正调节因子参与ABA信号转导，并表明ACPK1基因可能潜在地用于提高植物生物量产量。
