Liu Z, Yuan L, Sundaresan V, Yu X
a College of Agriculture and Forestry Sciences , Linyi University , Linyi , China.
b Institute of Vegetable Sciences , Zhejiang University , Hangzhou , China.
Plant Signal Behav. 2018;13(10):e1469360. doi: 10.1080/15592324.2018.1469360. Epub 2018 Aug 27.
Cytokinin independent 1 (CKI1) is a histidine kinase involved in the two-component signaling pathway and acts as a master regulator of central cell specification via CKI1-mediated two-component signaling. In this study, the dynamic distribution of two-component system (TCS) signals was primarily investigated during Arabidopsis embryo sac development. TCS signals were stably detected in female gametophytes cells from the megaspore stage all through to the mature embryo sac stage. CKI1 acts as the primary activator of the TCS signaling pathway in embryo sacs. Accordingly, focusing on CKI1, two alternate models are proposed for female gametophyte cell fate specification. In the first model, CKI1 co-determines the central cell fate in combination with a hypothetical X factor at the micropylar pole, and in the alternate model, CKI1 alone determines the central cell fate.
细胞分裂素非依赖1（CKI1）是一种参与双组分信号通路的组氨酸激酶，通过CKI1介导的双组分信号作为中央细胞特化的主要调节因子。在本研究中，主要研究了拟南芥胚囊发育过程中双组分系统（TCS）信号的动态分布。从大孢子阶段到成熟胚囊阶段，在雌配子体细胞中均能稳定检测到TCS信号。CKI1作为胚囊中TCS信号通路的主要激活因子。因此，围绕CKI1，提出了两种关于雌配子体细胞命运特化的替代模型。在第一个模型中，CKI1与珠孔极的一个假设的X因子共同决定中央细胞的命运，而在另一个模型中，CKI1单独决定中央细胞的命运。
