Effects of plant density on tillering in the weed grass Aegilops tauschii Coss. and its phytohormonal regulation

文献类型： 外文期刊

第一作者： Yu, Haiyan

作者： Yu, Haiyan;Cui, Hailan;Li, Zheng;Jia, Fang;Chen, Jingchao;Li, Xiangju;Yang, Juan

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关键词： Aegilops tauschii Coss; Endogenous hormone; Plant density; Tiller; 2,4-D isooctyl ester; 6-benzyl aminopurine; Gibberellin

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

ISSN： 0981-9428

年卷期： 2020 年 157 卷

页码：

收录情况： SCI

摘要： Aegilops tauschii Coss, a notorious wheat field weed, poses a serious threat to wheat in China. Tillers are an important agronomic tool for yield. In this study, a total of 12 Ae. tauschii populations were collected from China to investigate the effect of plant density on tiller occurrence and its phytohormonal regulation. We assayed the growth parameters of Ae. tauschii and the levels of endogenous hormones at different plant densities. The results showed that plant density had a significant effect on the quantity and quality of Ae. tauschii seeds produced per plant. In particular, the tiller and spike numbers per plant were negatively affected by plant density (P < 0.0001). The contents of 13 endogenous hormones in the tiller nodes changed in response to plant density. Among them, indole-3-acetic acid (IAA) and gibberellin (GA) positively responded to plant density. However, the reverse result was found for cytokinin (CTK). Interestingly, phylogenetic tree analysis of auxin (AeYUCCA), CK (AeIPT) and GA (AeCPS) biosynthesis related genes found that phylogenies in the Gramineae for the three different genes were various, hinting at horizontal gene transfer. Moreover, the dynamics of the expression of AeYUCCA, AelPT and AeCPS were roughly consistent with their phytohormone contents during tillering stage. When externally sprayed on plants of Ae. tauschii, 2,4-D isooctyl ester and GA(3) markedly reduced its tillering while 6-BA had no significant effect.

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