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首页> 外文期刊>Journal of Experimental Botany >Role of brassinosteroids in alleviation of phenanthrenecadmium co-contamination-induced photosynthetic inhibition and oxidative stress in tomato
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Role of brassinosteroids in alleviation of phenanthrenecadmium co-contamination-induced photosynthetic inhibition and oxidative stress in tomato

机译：油菜素甾体在减轻菲镉共污染诱导的番茄光合抑制和氧化胁迫中的作用

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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 micro M) alone was more phytotoxic than PHE applied alone (100 micro M); 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 micro M) 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.
机译：重金属污染经常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受性，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，研究了番茄植物中PHE，Cd和24-表油菜素内酯（EBR;生物活性BR）的相互作用。单独施用镉（100 micro M）比单独施用PHE（100 micro M）更具植物毒性。然而，与单独施用镉相比，它们在40 d暴露后的联合应用导致光合作用和色素含量略有提高。 PHE和/或Cd诱导了活性氧的积累和膜脂质过氧化。然而，Cd和PHE + Cd之间的作用差异不明显。将EBR（0.1 micro M）叶面施用到受PHE和/或Cd胁迫的植物上，可通过增强酶的活性以及抗氧化系统，二次代谢和异种生物素的相关转录水平来减轻光合抑制和氧化胁迫。排毒系统。此外，施用EBR后，叶子和根部的PHE和/或Cd残留量均显着降低，尤其是在用EBR处理的PHE + Cd胁迫植物中，表明这些污染物的解毒作用可能得到改善。因此，这些发现表明，EBR和PHE可能具有缓解Cd胁迫的作用。这些结果表明，EBR在减少食品安全的污染物残留以及加强植物修复方面具有积极作用。

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