| 郭瞻宇,张子杨,蒋亚辉,Altaf Hussain Lahori,张增强,李荣华.不同品种芥菜对镉胁迫的敏感性分布及抗氧化特征[J].农业环境科学学报,2018,37(12):2660-2668. |
| 不同品种芥菜对镉胁迫的敏感性分布及抗氧化特征 |
| Assessment of variation in sensitivity and antioxidant characteristics of different mustard cultivars under different Cd stress levels |
| 投稿时间：2018-02-07 |
| DOI：10.11654/jaes.2018-0202 |
| 中文关键词: 镉 芥菜品种 物种敏感性分布 抗氧化酶 积累特征 |
| 英文关键词: cadmium mustard cultivars species sensitivity distributions(SSD) antioxidant enzymes accumulation characteristics |
| 基金项目:陕西省科技统筹创新工程计划项目（2016KTCQ03-20）；十三五国家重点研发计划项目子课题（2017YFD0801101） |
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| 中文摘要: |
| 为探讨不同品种芥菜（Brassica juncea L.）对土壤中镉（Cd）胁迫的敏感性分布规律，筛选出耐性强、吸收高的品种，并了解其抗氧化特征和Cd累积特征，为我国Cd污染土壤植物修复提供理论依据。以国内市场上常见的21个芥菜品种为材料，通过盆栽试验，研究不同品种芥菜对Cd胁迫的剂量-效应关系、敏感性分布差异，在此基础上对两种代表性芥菜的抗氧化酶活性及Cd含量进行测定。结果表明：21个芥菜品种对Cd的敏感性分布频次具有明显差异，低浓度Cd（≤ 1.23 mg·kg-1）对17种芥菜生长产生一定的刺激效应，其生物量增长了2.0%~30.5%，而过量的Cd（≥ 6.90 mg·kg-1）则会产生明显的胁迫作用。特选九头鸟大叶芥菜（JTN）对Cd最为敏感，而包心芥菜（BJ）则表现出最高耐性。通过对JTN和BJ体内丙二醛（MDA）和抗氧化酶活性（SOD、POD、CAT）分析，BJ体内的MDA含量明显低于JTN，而抗氧化酶活性高于JTN。耐性品种BJ根部及地上部分的富集系数均大于1，地上部Cd积累量最高可达156.03 μg·株-1，且地上部对Cd污染土壤的净化率最大可达11.0%。研究表明，耐性品种BJ具有修复Cd污染土壤的潜力。 |
| 英文摘要: |
| Aiming to understand the variation in sensitivity of different mustard cultivars to cadmium (Cd) stress for screening the mustard cultivars with high tolerance and accumulation of Cd and investigating the antioxidative and Cd accumulation characteristics of mustard cul tivars, 21 types of dominant mustard cultivars available in the domestic market were studied in pot experiments. The dose-response relation ship and the species sensitivity distribution model of the mustard cultivars with Cd stress were evaluated. Furthermore, the Cd accumulation characteristics and the antioxidant enzyme activity of two representative mustard cultivars were examined in this study. The results showed that the cumulative frequencies of species sensitivity distributions of Cd stress varied significantly (P<0.05) among the tested mustard culti vars. The growth of 17 kinds of mustard biomass was improved by 2.0%~30.5% under the low-level of Cd stress (≤ 1.23 mg·kg-1), whereas excessive Cd stress (≥ 6.90 mg·kg-1) inhibited plant growth significantly. Among the 21 kinds of mustard cultivars used in this investigation, JTN was the most Cd stress-sensitive mustard cultivar, whereas the BJ cultivar showed the highest tolerance. The content of malonaldehyde enzyme (MDA) in BJ was lower than that in JTN, whereas the content of the antioxidant enzymes (SOD, POD, and CAT) in BJ was higher than that in JTN. Moreover, the bioconcentration factor (BCF) of BJ was larger than one for both roots and shoots. The highest Cd accumulation in shoots was 156.03 μg·plant-1, and the purification rate of Cd in soils was as high as 11.0%. Owing to the high Cd tolerance and accu mulation capability, the mustard cultivar BJ can be potentially used for phytoremediation of Cd-contaminated field soils. |
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