文献类型：期刊文献

英文题名：Cadmium accumulation and its effects on growth and gas exchange in four Populus cultivars

作者：Gu, Jiegang[1] Qi, Liwang[2] Jiang, Wusheng[1] Liu, Donghua[1]

第一作者：Gu, Jiegang

通信作者：Gu, JG[1]

机构：[1]Tianjin Normal Univ, Dept Biol, Coll Chem & Life Sci, Tianjin 300387, Peoples R China;[2]Chinese Acad Forestry, Cell Biol Lab, Res Inst Forestry, Beijing 100091, Peoples R China

年份：2007

卷号：49

期号：2

起止页码：7-14

外文期刊名：ACTA BIOLOGICA CRACOVIENSIA SERIES BOTANICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000253019400001)】；

语种：英文

外文关键词：Populus; Cd; net photosynthetic rate; stomatal conductance; phytoremediation

摘要：The effects of different concentrations of Cd2+ (10, 50 and 100 mu M) on the growth of four Populus cultivars (Populus sp. cv Zhonglin No. 46, P. sp. cv Langfang No. 4, P. sp. cv Qingyang, P. sp. cv Xiaoyeyang) and Cd2+ ion uptake were investigated. Cd accumulation in roots, shoot stems, young leaves and mature leaves, and bark and wood of cutting stems was analyzed using ICP-AES. Leaf gas exchange and photosynthetic parameters (net photosynthetic rate, stomatal conductance, transpiration rate) were measured in the first fully expanded leaf from the top shoot at the end of the treatment period. The lower Cd concentration (10 mu M) had no inhibitory effect on root growth in the four cultivars. Root growth was significantly inhibited at 100 mu M Cd. Among the investigated cultivars, P. sp. cv Qingyang showed stronger inhibition of root growth. Cd accumulation increased significantly with increasing Cd concentration and with time in all organs of the Populus cultivars. Cadmium concentrated mainly in the roots, and was higher there than in aerial parts. Cd concentrations were significantly higher in bark than in wood. Under 50 mu M and 100 mu M Cd stress, Cd content in shoot stems was highest in P. sp. cv Langlang No. 4, followed by P. sp. cv Xiaoyeyang and P. sp. cv Zhonglin No. 46. The potential of the cutlivars for phytoremediation of Cd is briefly discussed.