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| Assessment of variation in sensitivity and antioxidant characteristics of different mustard cultivars under different Cd stress levels |
| Received:February 07, 2018 |
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| KeyWord:cadmium;mustard cultivars;species sensitivity distributions(SSD);antioxidant enzymes;accumulation characteristics |
| Author Name | Affiliation | E-mail | | GUO Zhan-yu | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | ZHANG Zi-yang | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | JIANG Ya-hui | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | Altaf Hussain Lahori | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | ZHANG Zeng-qiang | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | zhangzq58@126.com | | LI Rong-hua | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | |
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| Abstract: |
| 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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