通过增强乙烯生物合成促进棉纤维伸长。

promotes cotton fiber elongation by enhancing ethylene biosynthesis.

作者信息

Zhu Liping, Dou Lingling, Shang Haihong, Li Hongbin, Yu Jianing, Xiao Guanghui

机构信息

College of Life Sciences, Shaanxi Normal University, Xi'an 710119, China.

School of Chemistry and Chemical Engineering, Xianyang Normal University, Xianyang 712000, China.

出版信息

iScience. 2021 Feb 17;24(3):102199. doi: 10.1016/j.isci.2021.102199. eCollection 2021 Mar 19.

Inositol-1,4,5-trisphosphate (IP) is an important second messenger and one of the products of phosphoinositide-specific phospholipase C (PIPLC)-mediated phosphatidylinositol (4,5) bisphosphate (PIP) hydrolysis. However, the function of IP in cotton is unknown. Here, we characterized the function of in cotton fiber elongation. was preferentially expressed in elongating fibers. Suppression of transcripts resulted in shorter fibers and decreased IP accumulation and ethylene biosynthesis. Exogenous application of linolenic acid (C18:3) and phosphatidylinositol (PI), the precursor of IP, improved IP and myo-inositol-1,2,3,4,5,6-hexakisphosphate (IP) accumulation, as well as ethylene biosynthesis. Moreover, fiber length in -silenced plant was reduced after exogenous application of IP and ethylene. These results indicate that positively regulates fiber elongation and IP promotes fiber elongation by enhancing ethylene biosynthesis. Our study broadens our understanding of the function of IP in cotton fiber elongation and highlights the possibility of cultivating better cotton varieties by manipulating in the future.

肌醇-1,4,5-三磷酸（IP）是一种重要的第二信使，是磷脂酰肌醇特异性磷脂酶C（PIPLC）介导的磷脂酰肌醇（4,5）二磷酸（PIP）水解产物之一。然而，IP在棉花中的功能尚不清楚。在此，我们对其在棉花纤维伸长中的功能进行了表征。它在伸长的纤维中优先表达。抑制其转录本会导致纤维变短，IP积累和乙烯生物合成减少。外源施加亚麻酸（C18:3）和IP的前体磷脂酰肌醇（PI），可改善IP和肌醇-1,2,3,4,5,6-六磷酸（IP6）积累以及乙烯生物合成。此外，外源施加IP和乙烯后，沉默该基因的植株中的纤维长度会降低。这些结果表明，该基因正向调节纤维伸长，IP通过增强乙烯生物合成来促进纤维伸长。我们的研究拓宽了我们对IP在棉花纤维伸长中功能的理解，并突出了未来通过操纵该基因培育更好棉花品种的可能性。