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首页> 外文期刊>Journal of Experimental Botany >Characteristics of cadmium accumulation and tolerance in novel Cd-accumulating crops, Avena strigosa and Crotalaria juncea
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Characteristics of cadmium accumulation and tolerance in novel Cd-accumulating crops, Avena strigosa and Crotalaria juncea

机译：新型镉积累农作物Avena strigosa和猪屎豆属Cd的积累和耐性特征

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Characteristics of accumulation and tolerance of cadmium (Cd) in green manure crops were investigated to identify Cd-accumulating crops and to clarify the mechanisms involved in Cd accumulation and tolerance. Seedlings of eight crop species were treated with Cd (1 mg l−1 or 5 mg l−1) in the growing medium for 4 d. Cd concentration in leaves of Avena strigosa Schreb. cv. New-oat, Crotalaria juncea L. and Tagetes erecta L. cv. African-tall was greater than values used to define Cd-hyperaccumulation (>100 mg Cd kg−1 DW). However, in leaves of T. erecta, lipid peroxidation level increased significantly, and the activities of superoxide dismutase, ascorbate peroxidase, glutathione reductase, and catalase were depressed by both Cd treatments. By contrast, A. strigosa and C. juncea exhibited high Cd tolerance. Avena strigosa leaves showed higher activities of antioxidative enzymes such as superoxide dismutase and ascorbate peroxidase than those of other species tested. Crotalaria juncea showed higher amounts of total soluble phenolics which, in leaves, were doubled by 5 mg l−1 Cd treatment. When two Cd-tolerant accumulators (A. strigosa and C. juncea) and the non-accumulator (C. spectabilis) were treated with lower Cd concentrations for 4 weeks, A. strigosa and C. juncea exhibited superior Cd accumulation in the shoots with greater biomass production compared with C. spectabilis. These results indicate that A. strigosa and C. juncea possess the greater potential for Cd accumulation and tolerance than common crops.
机译：研究了绿色肥料作物中镉（Cd）的积累和耐性特征，以识别积累镉的作物，并阐明参与镉积累和耐性的机制。在生长培养基中，对8种作物的幼苗进行Cd处理（1 mg l -1 或5 mg l -1 ）。 Avena strigosa Schreb叶片中的Cd浓度。简历。新燕麦，猪屎豆属和番茄万寿菊。非洲人的身高大于定义Cd超富集的值（> 100 mg Cd kg -1 DW）。然而，在直立茎叶中，脂质过氧化水平显着增加，并且两种镉处理均降低了超氧化物歧化酶，抗坏血酸过氧化物酶，谷胱甘肽还原酶和过氧化氢酶的活性。相反，A。strigosa和C. juncea表现出高的Cd耐受性。 Avena strigosa叶片显示出比其他测试物种更高的抗氧化酶活性，例如超氧化物歧化酶和抗坏血酸过氧化物酶。猪屎豆属显示出较高的总可溶性酚类含量，在叶片中，通过5 mg l -1 Cd处理可增加一倍。当用较低的Cd浓度处理两个耐Cd的累积剂（A. strigosa和C. juncea）和非累积剂（C. spectabilis）4周时，A。strigosa和C. juncea的芽中Cd积累较高。与壮观藻相比，生物量产量更高。这些结果表明，与普通农作物相比，A。strigosa和C. juncea具有更大的Cd积累和耐性潜力。

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