Yang Weidong, Wu Feifei, Ding Zheli, Zhang Xincheng, Zhao Fengliang, Wang Yuyan, Yang Xiaoe
Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.
Haikou Experimental Station, Chinese Academy of Tropical Agricultural Sciences (CATAS), Haikou, China.
Bull Environ Contam Toxicol. 2018 Nov;101(5):644-650. doi: 10.1007/s00128-018-2434-1. Epub 2018 Oct 27.
Cadmium (Cd) accumulation and tolerance in seven ornamental willow genotypes were investigated at different Cd levels (0, 5, 25, 50, and 100 µM) through hydroponic culture in a greenhouse. Severe phytotoxic symptoms in leaves and roots including leaf chlorosis and root browning were noticed when grown at ≥ 50 µM Cd. All genotypes showed high tolerance to low Cd levels (5 µM and 25 µM Cd), in contrast to high Cd levels (i.e. 50 µM and 100 µM) that severely disturbed plant growth of all genotypes. Cadmium concentrations reached 165.0-1251.0 µg g DW in leaves, 22.9-331.2 µg g in stems among the genotypes at 5-25 µM Cd, and Cd mainly accumulated in the roots. Although willow tissues can accumulate relatively high Cd concentrations under high Cd levels (≥ 50 µM), they are not suitable for phytoextraction of Cd due to poor growth.
通过温室水培法，研究了七种观赏柳树基因型在不同镉水平（0、5、25、50和100μM）下的镉积累和耐受性。当在≥50μM镉水平下生长时，叶片和根部出现严重的植物毒性症状，包括叶片黄化和根部褐变。所有基因型对低镉水平（5μM和25μM镉）表现出高耐受性，而高镉水平（即50μM和100μM）则严重干扰了所有基因型的植物生长。在5-25μM镉水平下，各基因型叶片中的镉浓度达到165.0-1251.0μg g干重，茎中的镉浓度为22.9-331.2μg g，镉主要积累在根部。尽管柳树组织在高镉水平（≥50μM）下可以积累相对较高的镉浓度，但由于生长不良，它们不适合用于镉的植物提取。
