Cadmium Accumulation and Tolerance in Seven Ornamental Willow Genotypes
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−1 DW in leaves, 22.9–331.2 µg g−1 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.
KeywordSalix genotypes Cadmium Hydroponic culture Phytoremediation
This work was funded by the Natural Science Foundation of China (Grant No. 31100513), the Key International Cooperative Project of CN-USA (Grant No. 2010DFB33960), the Key Project of Ningbo Science and Technology Bureau of Zhejiang Province (Grant No. 2012C10003), the Key project of Ministry of Science and Technology of China (Grant No. 2012BAC17B02) and the Fundamental Research Funds for the Central Universities. We are thankful to Zhang Huaxian for her excellent technical assistance.
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