Effects of S-metolachlor on wheat (Triticum aestivum L.) seedling root exudates and the rhizosphere microbiome
Effects of S-metolachlor on wheat (Triticum aestivum L.) seedling root exudates and the rhizosphere microbiome
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精异丙甲草胺对小麦 (Triticum aestivum L.) 幼苗根系分泌物和根际微生物组的影响
DOI：
10.1016/j.jhazmat.2021.125137
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发表时间：
2021
影响因子：
13.6
通讯作者：
Qian Haifeng
中科院分区：
文献类型：
--
作者：
Qu Qian;Li Yan;Zhang Zhenyan;Cui Hengzheng;Zhao Qianqiu;Liu Wanyue;Lu Tao;Qian Haifeng
精异丙甲草胺（S-ME）是一种常用的氯乙酰苯胺类除草剂。本文研究了S-ME对小麦幼苗生长的影响，并通过代谢组学探讨了S-ME改变根际微生物组的驱动因素。结果表明，4 mg/kg的S-ME通过诱导H2 O2产生，对植物生长产生强烈的抑制作用。S-ME处理后根际微生物群落的丰富度显著下降，但一些潜在的有益根际细菌（如根瘤菌科和伯克霍尔德菌科）的丰度增加，表明植物招募了潜在的有益微生物来抵抗S-ME诱导的胁迫。斯皮尔曼相关分析表明，S-ME处理后，根瘤菌和伯克霍尔德菌与植物分泌的有机酸呈正相关，说明潜在的有益微生物可能主要被有机酸吸引。我们的研究结果表明，S-ME对作物生长的植物毒性，并表明S-ME可以影响根际微生物丰度和潜在的有益微生物的招聘可能是根系分泌物调节的结果。
S-metolachlor (S-ME) is a common chloroacetanilide herbicide. Here, we investigated the effects of S-ME on wheat seedling growth and explored via metabolomics the driver through which S-ME changes the rhizosphere microbiome. The results indicated that 4 mg/kg S-ME had a strong inhibitory effect on plant growth by inducing hydrogen peroxide (H2O2) levels. The richness of the rhizosphere microbiome markedly decreased after S-ME treatment, although the abundance of some potential beneficial rhizobacteria, such asRhizobiaceaeandBurkholderiaceae, increased suggesting that plants recruited potential beneficial microorganisms to resist S-ME-induced stress. Spearman correlation analysis revealed thatRhizobiaceaeandBurkholderiaceaewere positively correlated with organic acids secreted by plants after S-ME treatment, implying that potential beneficial microorganisms may be attracted mainly by organic acids. Our results demonstrated the phytotoxicity of S-ME on crop growth and indicated both that S-ME could influence rhizosphere microorganism abundance and that recruitment of potential beneficial microorganisms could be the result of root exudate regulation.