数字农科院2.0

Sphingosine Promotes Fiber Early Elongation in Upland Cotton

文献类型： 外文期刊

作者： Li Wang;Changyin Jin;Wenqing Zhang;Xueting Mei;Hang Yu;Man Wu;Wenfeng Pei;Jianjiang Ma;Bingbing Zhang;Ming Luo;Jiwen Yu

作者机构：

关键词： cotton;fiber elongation;sphingolipidomics;sphingosine;transcriptomics

期刊名称： Plants

ISSN： 2223-7747

年卷期： 2024 年 13 卷 14 期

页码：

收录情况： SCIE（2024版）

摘要： Sphingolipids play an important role in cotton fiber development, but the regulatory mechanism is largely unclear. We found that serine palmitoyltransferase (SPT) enzyme inhibitors, myriocin and sphingosine (dihydrosphingosine (DHS) and phytosphingosine (PHS)), affected early fiber elongation in cotton, and we performed a sphingolipidomic and transcriptomic analysis of control and PHS-treated fibers. Myriocin inhibited fiber elongation, while DHS and PHS promoted it in a dose–effect manner. Using liquid chromatography–tandem mass spectrometry (LC–MS/MS), we found that contents of 22 sphingolipids in the PHS-treated fibers for 10 days were changed, of which the contents of 4 sphingolipids increased and 18 sphingolipids decreased. The transcriptome analysis identified 432 differentially expressed genes (238 up-regulated and 194 down-regulated) in the PHS-treated fibers. Among them, the phenylpropanoid biosynthesis pathway is the most significant enrichment. The expression levels of transcription factors such as MYB, ERF, LBD, and bHLH in the fibers also changed, and most of MYB and ERF were up-regulated. Auxin-related genes IAA, GH3 and BIG GRAIN 1 were up-regulated, while ABPs were down-regulated, and the contents of 3 auxin metabolites were decreased. Our results provide important sphingolipid metabolites and regulatory pathways that influence fiber elongation.

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