Role of brassinosteroids in alleviation of phenanthrene-cadmium co-contamination-induced photosynthetic inhibition and oxidative stress in tomato.
Role of brassinosteroids in alleviation of phenanthrene-cadmium co-contamination-induced photosynthetic inhibition and oxidative stress in tomato.
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DOI：
10.1093/jxb/ers323
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发表时间：
2013-01
影响因子：
6.9
通讯作者：
Yu J
中科院分区：
文献类型：
--
作者：
Ahammed GJ;Choudhary SP;Chen S;Xia X;Shi K;Zhou Y;Yu J
重金属污染往往与有机污染物一起发生。油菜素类固醇(BRs)诱导植物对几种非生物胁迫的耐性，包括菲(Phe)和镉(Cd)胁迫。然而，BRs在Phe+Cd共污染诱导的应激缓解中的作用尚不清楚。在这里，研究了Phe、Cd和24-表油菜素内酯(EBR；一种生物活性BR)在番茄植株中的交互作用。单独使用Cd(100µM)比单独使用Phe(100µM)具有更强的植物毒性，但在暴露40d后，与单独使用Cd相比，它们的光合作用活性和色素含量略有提高。Phe和/或Cd均能诱导细胞内活性氧积累和膜脂过氧化，但Cd与Phe+Cd的作用差异不显著。在Phe和/或Cd胁迫下，叶面喷施EBR(0.1µM)可通过提高抗氧化系统、次生代谢和外源解毒系统的酶活性和相关转录水平来缓解光合作用抑制和氧化胁迫。此外，施加EBR后，Phe和/或Cd在叶和根中的残留量都显著减少，尤其是在Phe+Cd胁迫的植物中，表明EBR可能改善了这些污染物的解毒作用。因此，这些发现表明EBR和Phe在缓解Cd应激方面存在潜在的相互作用。这些结果表明，EBR在减少食品安全污染物残留和加强植物修复方面具有积极作用。
Heavy metal pollution often occurs together with organic contaminants. Brassinosteroids (BRs) induce plant tolerance to several abiotic stresses, including phenanthrene (PHE) and cadmium (Cd) stress. However, the role of BRs in PHE+Cd co-contamination-induced stress amelioration is unknown. Here, the interactive effects of PHE, Cd, and 24-epibrassinolide (EBR; a biologically active BR) were investigated in tomato plants. The application of Cd (100 µM) alone was more phytotoxic than PHE applied alone (100 µM); however, their combined application resulted in slightly improved photosynthetic activity and pigment content compared with Cd alone after a 40 d exposure. Accumulation of reactive oxygen species and membrane lipid peroxidation were induced by PHE and/or Cd; however, the differences in effect were insignificant between Cd and PHE+Cd. The foliar application of EBR (0.1 µM) to PHE- and/or Cd-stressed plants alleviated photosynthetic inhibition and oxidative stress by causing enhancement of the activity of the enzymes and related transcript levels of the antioxidant system, secondary metabolism, and the xenobiotic detoxification system. Additionally, PHE and/or Cd residues were significantly decreased in both the leaves and roots after application of EBR, more specifically in PHE+Cd-stressed plants when treated with EBR, indicating a possible improvement in detoxification of these pollutants. The findings thus suggest a potential interaction of EBR and PHE for Cd stress alleviation. These results advocate a positive role for EBR in reducing pollutant residues for food safety and also strengthening phytoremediation.
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影响因子：
6.9
作者：
Alkio, M;Tabuchi, TM;Colón-Carmona, A
通讯作者：
Colón-Carmona, A
一氧化氮在黄瓜油菜素类固醇过氧化氢依赖性诱导非生物胁迫耐受性中的作用
影响因子：
7.3
作者：
Cui, Jin-Xia;Zhou, Yan-Hong;Yu, Jing-Quan
通讯作者：
Yu, Jing-Quan
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影响因子：
2.6
作者：
Ci, Dunwei;Jiang, Dong;Cao, Weixing
通讯作者：
Cao, Weixing
影响因子：
6.9
作者：
Choudhary SP;Oral HV;Bhardwaj R;Yu JQ;Tran LS
通讯作者：
Tran LS
影响因子：
4.9
作者：
Adams SV;Passarelli MN;Newcomb PA
通讯作者：
Newcomb PA