APX公司
镉
芸苔属
栽培
抗氧化剂
谷胱甘肽
植物修复
酶
园艺
生物
植物
化学
生物化学
污染
生态学
有机化学
作者
Zhichao Wu,Xiaohu Zhao,Xu Sun,Qiling Tan,Yajuan Tang,Zhaojun Nie,Chanjuan Qu,Zuoxin Chen,Chengxiao Hu
出处
期刊:Chemosphere
[Elsevier]
日期:2015-11-01
卷期号:138: 526-536
被引量:119
标识
DOI:10.1016/j.chemosphere.2015.06.080
摘要
Oilseed rape (Brassica napus L.) with high tolerance to cadmium (Cd) may be used in the phytoremediation of Cd-contaminated fields. However, the mechanisms responsible for Cd accumulation and tolerance in oilseed rape are still poorly understood. Here, we investigated the physiological and molecular processes involved in Cd tolerance of two oilseed rape cultivars with different Cd accumulation abilities. The total Cd accumulation in cultivar L351 was higher than cultivar L338, particularly with increasing concentrations of Cd exposure. L338 was a more pronounced Cd-sensitive cultivar than L351, while higher activities of antioxidant enzymes (CAT, APX, GR, DHAR) as well as higher contents of GSH and AsA were all observed in L351 under Cd treatments, especially at high levels. No differences were found in SOD activities between the two cultivars under the same Cd treatments, suggesting that SOD was not the key factor in relation to the differences of Cd tolerance and accumulation between them. Gene expression levels of BnFe-SOD, BnCAT, BnAPX, BcGR and BoDHAR in roots of L351 were relatively higher than that in L338 under Cd exposure as well as BnCAT and BcGR in leaves. It is concluded that antioxidant enzymes and the ascorbate–glutathione cycle play important roles in oilseed rape Cd accumulation and tolerance.
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