Mepiquat chloride promotes cotton lateral root formation by modulating plant hormone homeostasis
文献类型： 外文期刊
作者： Wu, Qian 1 ; Du, Mingwei 1 ; Wu, Jie 2 ; Wang, Ning 3 ; Wang, Baomin 1 ; Li, Fangjun 1 ; Tian, Xiaoli 1 ; Li, Zhaohu 1 ;
作者机构： 1.China Agr Univ, Coll Agron & Biotechnol, Beijing 100193, Peoples R China
2.Nanjing Agr Univ, Plant Phen Res Ctr, State Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Jiangsu, Peoples R China
3.Chinese Acad Agr Sci, Inst Cotton Res, Anyang 455000, Henan, Peoples R China
关键词： Cotton; Mepiquat chloride (MC); Lateral root; Phytohormone; Transcriptome
期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）
ISSN： 1471-2229
年卷期： 2019 年 19 卷 1 期
页码：
收录情况： SCI
摘要： Background Mepiquat chloride (MC), a plant growth regulator, enhances root growth by promoting lateral root formation in cotton. However, the underlying molecular mechanisms of this phenomenon is still unknown. Methods In this study, we used 10 cotton (Gossypium hirsutum Linn.) cultivars to perform a seed treatment with MC to investigate lateral root formation, and selected a MC sensitive cotton cultivar for dynamic monitor of root growth and transcriptome analysis during lateral root development upon MC seed treatment. Results The results showed that MC treated seeds promotes the lateral root formation in a dosage-depended manner and the effective promotion region is within 5 cm from the base of primary root. MC treated seeds induce endogenous auxin level by altering gene expression of both gibberellin (GA) biosynthesis and signaling and abscisic acid (ABA) signaling. Meanwhile, MC treated seeds differentially express genes involved in indole acetic acid (IAA) synthesis and transport. Furthermore, MC-induced IAA regulates the expression of genes related to cell cycle and division for lateral root development. Conclusions Our data suggest that MC orchestrates GA and ABA metabolism and signaling, which further regulates auxin biosynthesis, transport, and signaling to promote the cell division responsible for lateral root formation.
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