Epibrassinolide improves the growth performance of Sedum lineare upon Zn stress through boosting antioxidative capacities.
Epibrassinolide improves the growth performance of Sedum lineare upon Zn stress through boosting antioxidative capacities.
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DOI：
10.1371/journal.pone.0257172
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发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Liao H
中科院分区：
文献类型：
--
作者：
Zhang Y;Liao H
锌作为一种必需元素，其浓度不同，对植物的生长有促进或抑制作用。本文研究了不同锌浓度下调节植物生长和减轻非生物胁迫伤害的植物激素--24-表油菜素内酯(EBR)对景天形态参数和抗氧化能力的影响。与只施锌的植株相比，同时叶面喷施0.75mEBR显著改善了植株的多个形态特征，且这种促进生长的作用在高锌浓度下更为显著。当施锌浓度为80 0μM时，EBR对植株生长的促进作用最为显著，茎长、鲜重和节间长度分别比单施锌处理提高111%、85%和157%。EBR喷雾还提高了抗氧化酶(POD)、抗坏血酸过氧化物酶(APX)、谷胱甘肽还原酶(GR)的活性，以及抗氧化剂抗坏血酸(ASA)和谷胱甘肽(GSH)的含量，从而减少了植物体内活性氧(ROS)的积累，减轻了膜脂过氧化作用。因此，通过证明EBR可以通过增强抗氧化系统来帮助景天科植物抵御高锌胁迫，为今后扩大景天科植物在重金属污染土壤中的种植范围以达到植物修复的目的提供了新的思路。
As an essential element, zinc (Zn) can improve or inhibit the growth of plants depending on its concentrations. In this study, the effects of 24-Epibrassinolide (EBR), one well-known steroid phytohormone regulating plant growth and alleviating abiotic stress damage, on morphological parameters and antioxidant capacities of Sedum lineare were investigated under different Zn doses. Compared to plants only exposed to Zn, simultaneously foliar application of 0.75 μM EBR significantly improved multiple morphological characteristics and such growth-improving effects were more significant at high Zn concentrations. At a detrimental 800 μM Zn, EBR benefitted plant growth most prominently, as shown by that the stem length, fresh weight and internode length were increased by 111%, 85% and 157%, respectively; than Zn solely treated plants. EBR spray also enhanced both the activities of antioxidant enzymes such as peroxidase (POD), ascorbate peroxidase (APX), glutathione reductase (GR), and the contents of antioxidative agents including ascorbic acid (AsA) and glutathione (GSH), which in turn decreased the accumulation of reactive oxygen species (ROS) and alleviated the lipid peroxidation in plants. Thus, by demonstrating that EBR could help S. lineare resist high-zinc stress through strengthening the antioxidant system, this work provided a new idea for expanding the planting range of Crassulaceae plants in heavy metal contaminated soil for phytoremediation purpose in the future.
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