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生长素及其与乙烯的相互作用调控苹果砧木不定根的形成与发育。

Auxin and Its Interaction With Ethylene Control Adventitious Root Formation and Development in Apple Rootstock.

作者信息

Bai Tuanhui, Dong Zhidan, Zheng Xianbo, Song Shangwei, Jiao Jian, Wang Miaomiao, Song Chunhui

机构信息

College of Horticulture, Henan Agricultural University, Zhengzhou, China.

出版信息

Front Plant Sci. 2020 Oct 15;11:574881. doi: 10.3389/fpls.2020.574881. eCollection 2020.

DOI:10.3389/fpls.2020.574881
PMID:33178245
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7593273/
Abstract

Adventitious root (AR) formation is indispensable for vegetative asexual propagation. Indole-3-butyric acid (IBA) functioned indirectly as precursor of IAA in regulating AR formation. Ethylene affects auxin synthesis, transport, and/or signaling processes. However, the interactions between auxin and ethylene that control AR formation in apple have not been elucidated. In this study, we investigated the effects of IBA and its interaction with ethylene on AR development in apple. The results revealed that IBA stimulated the formation of root primordia, increased the number of ARs, and upregulated expression of genes (, , and ) involved in AR formation. Comparison of different periods of IBA application indicated that IBA was necessary for root primordium formation, while long time IBA treatment obviously inhibited root elongation. RNA-seq analysis revealed that many plant hormone metabolism and signal transduction related genes were differentially expressed. IBA stimulated the production of ethylene during AR formation. Auxin inhibiting ARs elongation depended on ethylene. Together, our results suggest that the inhibitory role of auxin on AR elongation in apples is partially mediated by stimulated ethylene production.

摘要

不定根（AR）的形成对于营养体无性繁殖至关重要。吲哚-3-丁酸（IBA）在调节不定根形成过程中作为生长素（IAA）的前体发挥间接作用。乙烯影响生长素的合成、运输和/或信号传导过程。然而，苹果中控制不定根形成的生长素与乙烯之间的相互作用尚未阐明。在本研究中，我们研究了IBA及其与乙烯的相互作用对苹果不定根发育的影响。结果表明，IBA刺激根原基的形成，增加不定根数量，并上调参与不定根形成的基因（、和）的表达。不同时期IBA施用的比较表明，IBA是根原基形成所必需的，而长时间的IBA处理明显抑制根的伸长。RNA测序分析表明，许多植物激素代谢和信号转导相关基因存在差异表达。IBA在不定根形成过程中刺激乙烯的产生。生长素对不定根伸长的抑制作用依赖于乙烯。总之，我们的结果表明，生长素对苹果不定根伸长的抑制作用部分是由刺激乙烯产生介导的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f3a/7593273/2cd1985a546a/fpls-11-574881-g010.jpg
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