Plant Stature Related receptor-like Kinanse2 (PSRK2) acts as a factor that determines stem elongation toward gibberellins response in rice
Plant Stature Related receptor-like Kinanse2 (PSRK2) acts as a factor that determines stem elongation toward gibberellins response in rice
复制标题
植物身高相关受体样 Kinanse2 (PSRK2) 是决定水稻茎伸长对赤霉素反应的一个因素
DOI：
10.1080/09168451.2018.1501266
复制
发表时间：
2018-11-02
影响因子：
1.6
通讯作者：
Liu, Xuanming
中科院分区：
文献类型：
--
作者：
Li, Yixing;Tang, Dongying;Liu, Xuanming
赤霉素（giberellins, GAs）是一类植物激素，对植物生长发育的多个方面，尤其是茎伸长具有重要作用。通过筛选和鉴定RLK显性阴性突变体获得PSRK2。功能缺失突变体PSRK2 - dn和PSRK2 - rnai的表型显示，PSRK2可以影响最上面和第四个节间的长度，这表明PSRK2可能调节节间分生组织的细胞分裂和/或细胞伸长。此外，PSRK2的表达模式显示，在生殖生长启动后，PSRK2在接合节中强烈表达，而在叶片中则检测不到。在GA的诱导下，PSRK2的表达也被发现(3)，PSRK2参与了谷物粉粒细胞的GA信号传导，并影响幼苗期第二叶鞘的相对长度。这些结果表明，PSRK2是遗传信号通路的一个组成部分，通过负调控遗传反应来控制茎伸长。
Gibberellins (GAs) are a family of plant hormones that are important to multiple aspects of plant growth and development, especially stem elongation. A PSRK2 was obtained through screening and identifying RLK dominant negative mutants. Phenotype of the loss-of-function mutants, psrk2-DN and psrk2-RNAi, showed that PSRK2 could influence the length of the uppermost and fourth internodes, indicating that PSRK2 might regulate cell division in the intercalary meristems and/or cell elongation in the internodes. Moreover, the expression pattern showed that PSRK2 was strongly expressed in the joined-nodes after the start-up of reproductive growth, but undetectable in leaves. PSRK2 expression was also found to be induced by GA(3), and PSRK2 was involved in GA signaling in cereal aleurone cells, and PSRK2 influence the relative length of the second leaf sheaths in seedling stage. These results indicate PSRK2 is a component of GA signaling pathway that controls stem elongation by negatively regulating GA responses.