Thitisaksakul Maysaya, Dong Shaoyun, Beckles Diane M
a Department of Biochemistry , Faculty of Science, Khon Kaen University , Khon Kaen , Thailand.
b Department of Plant Sciences , University of California , Davis , CA , USA.
Plant Signal Behav. 2017 Dec 2;12(12):e1403708. doi: 10.1080/15592324.2017.1403708. Epub 2017 Dec 8.
We have previously shown that overexpression of GSK3-like kinase 5 in rice (OsGSK5) was associated with higher starch accumulation and better growth under severe salinity stress. Short-term CO feeding experiments suggested that OsGSK5 promoted higher flux to starch accumulation in the roots under this condition and that this mechanism may help to underscore the better growth characteristics observed. Here, we expand upon this hypothesis and consider (1) how OsGSK5 action could fit into a signaling model that integrates salinity stress to changes in starch metabolism, and (2) how this would facilitate whole plant physiological adaptations in source-to-sink partitioning. We also discuss additional functions of OsGSK5, necessary to support this adaptive mechanism.
我们之前已经表明，水稻中糖原合成酶激酶3样激酶5（OsGSK5）的过表达与在严重盐胁迫下更高的淀粉积累和更好的生长相关。短期的一氧化碳（CO）喂养实验表明，在这种条件下，OsGSK5促进了根部淀粉积累的更高通量，并且这种机制可能有助于强调所观察到的更好的生长特性。在这里，我们扩展这一假设，并考虑：（1）OsGSK5的作用如何能融入一个将盐胁迫与淀粉代谢变化整合起来的信号模型中；（2）这将如何促进源库分配中整个植株的生理适应。我们还讨论了支持这种适应性机制所需的OsGSK5的其他功能。
