数字农科院2.0

Salinity Reduces 2,4-D Efficacy In E.chinochloa Crusgalli By Affecting R edox Balance, Nutrient Acquisition, And Hormonal Regulation

文献类型： 外文期刊

作者： Xie, Yuan;Yang, Chong;Islam, Faisal;Islam, Faisal;Zhou, Weijun;Farooq, Muhammad A.;Farooq, Muhammad A.;Wang, Jian;Gill, Rafaqat A.;Gill, Rafaqat A.;Xie, Yuan;Zhu, Jinwen;Zhou, Weijun;Farooq, Muhammad A.;Yang, Chong;Zhu, Jinwen;Wang, Jian

作者机构：

关键词： 2,4-Dichlorophenoxyacetic acid; Abscisic acid; Indole acetic acid; Salinity; ROS; Antioxidants

期刊名称： PROTOPLASMA

ISSN： 0033-183X

年卷期： 2018 年 255 卷 3 期

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摘要： Distinct salinity levels have been reported to enhance plants tolerance to different types of stresses. The aim of this research is to assess the interaction of saline stress and the use of 2,4-D as a means of controlling the growth of Echinochloa crusgalli. The resultant effect of such interaction is vital for a sustainable approach of weed management and food production. The results showed that 2,4-D alone treatment reduces the chlorophyll contents, photosynthetic capacity, enhanced MDA, electrolyte leakage, and ROS production (H2O2, O-2(center dot-)) and inhibited the activities of ROS scavenging enzymes. Further analysis of the ultrastructure of chloroplasts indicated that 2,4-D induced severe damage to the ultrastructure of chloroplasts and thylakoids. Severe saline stress (8 dS m(-1)) followed by mild saline stress treatments (4 dS m(-1)) also reduced the E. crusgalli growth, but had the least impact as compared to the 2,4-D alone treatment. Surprisingly, under combined treatments (salinity + 2,4-D), the phytotoxic effect of 2,4-D was reduced on saline-stressed E. crusgalli plants, especially under mild saline + 2,4-D treatment. This stimulated growth of E. crusgalli is related to the higher activities of enzymatic and non-enzymatic antioxidants and dynamic regulation of IAA, ABA under mild saline + 2,4-D treatment. This shows that 2,4-D efficacy was affected by salinity in a stress intensity-dependent manner, which may result in the need for greater herbicide application rates, additional application times, or more weed control operations required for controlling salt-affected weed.

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