Cadmium stress in wheat seedlings: growth, cadmium accumulation and photosynthesis

被引:87
作者
Ci, Dunwei [2 ]
Jiang, Dong [1 ,2 ]
Wollenweber, Bernd [3 ]
Dai, Tingbo [2 ]
Jing, Qi [2 ]
Cao, Weixing [2 ]
机构
[1] Nanjing Agr Univ, Coll Agr, Nanjing 210095, Jiangsu Prov, Peoples R China
[2] Nanjing Agr Univ, Minist Agr, Hi Tech Key Lab Informat Agr Jiangsu Prov, Key Lab Crop Physiol & Ecol So China, Nanjing 210095, Jiangsu Prov, Peoples R China
[3] Aarhus Univ, Res Ctr Flakkebjerg, Dept Genet & Biotechnol, DK-4200 Slagelse, Denmark
基金
中国国家自然科学基金;
关键词
Cadmium stress; Gas exchange; Chlorophyll fluorescence; Growth; Regression model; Wheat; CHLOROPHYLL FLUORESCENCE; OXIDATIVE STRESS; CD TOXICITY; DAMAGE; GRAIN; CULTIVARS; RESPONSES; LEAVES;
D O I
10.1007/s11738-009-0414-0
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Seedlings of wheat (Triticum aestivum L.) cultivars Jing 411, Jinmai 30 and Yangmai 10 were exposed to 0, 10, 20, 30, 40 or 50 mu M of CdCl2 in a solution culture experiment. The effects of cadmium (Cd) stress on wheat growth, leaf photon energy conversion, gas exchange, and Cd accumulation in wheat seedlings were investigated. Gas exchange was monitored at 3, 9, 24 days after treatment (DAT). Growth parameters, chlorophyll content, leaf chlorophyll fluorescence, and Cd concentration in shoot and root were measured at 24 DAT. Seedling growth, gas exchange, chlorophyll content, chlorophyll fluorescence parameters were generally depressed by Cd stress, especially under the high Cd concentrations. Cd concentration and accumulation in both shoots and roots increased with increasing external Cd concentrations. Relationships between corrected parameters of growth, photosynthesis and fluorescence and corrected Cd concentrations in shoots and roots could be explained by the regression model Y = K/(1 + exp(a + bX)). Jing 411 was found to be Cd tolerant considering parameters of chlorophyll content, photosynthesis and chlorophyll fluorescence in which less Cd translocation was from roots into shoots. The high Cd concentrations were in shoots and roots in Yangmai 10 which has been found to be a relative Cd tolerant cultivar in terms of most growth parameters.
引用
收藏
页码:365 / 373
页数:9
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