College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China.
College of Agronomy, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China.
Environ Sci Pollut Res Int. 2018 Dec;25(35):35492-35500. doi: 10.1007/s11356-018-3517-6. Epub 2018 Oct 22.
Chromium (Cr) pollution is at a worrying level in a region of oilseed rape production in China. Sulfur (S) is an indispensable element for plants that has been confirmed to play an important role in regulating plant response to heavy metal stress. The present study was conducted to examine the role of S in alleviating Cr toxicity in oilseed rape. Cr stress strongly induced oxidative stress and inhibited plant growth. Application of S significantly enhanced the tolerance of oilseed rape exposed to Cr stress by activating several detoxification mechanisms including the ascorbate-glutathione (AsA-GSH) enzyme defense system and GSH production. The Cr and phytochelatins (PC) contents in the root under S treatment were markedly higher than those under Cr stress. The transcript abundances of the heavy metal transporters HMA2 and HMA4 were lower under S treatment than under Cr treatment. Most Cr was restricted to roots, and the translocation factor (TF) of Cr was markedly decreased in oilseed rape. In conclusion, our study revealed that S application is advantageous to oilseed rape defense against Cr toxicity and inhibits Cr translocation from roots to shoots.
中国某油菜籽产区的铬污染令人担忧。硫（S）是植物不可缺少的元素，已被证实对植物应对重金属胁迫具有重要作用。本研究旨在探讨 S 在缓解油菜籽铬毒性中的作用。铬胁迫强烈诱导氧化应激，抑制植物生长。S 的应用通过激活几种解毒机制，包括抗坏血酸-谷胱甘肽（AsA-GSH）酶防御系统和 GSH 的产生，显著增强了暴露于 Cr 胁迫下的油菜的耐受性。与 Cr 胁迫相比，S 处理后根中的 Cr 和植物螯合肽（PC）含量明显更高。重金属转运蛋白 HMA2 和 HMA4 的转录丰度在 S 处理下低于 Cr 处理下。大多数 Cr 被限制在根部，油菜籽的铬转运因子（TF）明显降低。总之，我们的研究表明，S 的应用有利于油菜籽抵御铬毒性，并抑制 Cr 从根部向地上部的转运。
