Cadmium stress in wheat seedlings: growth, cadmium accumulation and photosynthesis
Cadmium stress in wheat seedlings: growth, cadmium accumulation and photosynthesis
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小麦幼苗的镉胁迫：生长、镉积累和光合作用
DOI：
10.1007/s11738-009-0414-0
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发表时间：
2010-03-01
影响因子：
2.6
通讯作者：
Cao, Weixing
中科院分区：
文献类型：
--
作者：
Ci, Dunwei;Jiang, Dong;Cao, Weixing
小麦(Triticum aestivum L.)以京411、晋麦30和扬麦10号为试材，分别用0、10、20、30、40、50亩M的氯化镉溶液培养。研究了镉(Cd)胁迫对小麦生长、叶片光能转化、气体交换和Cd积累的影响。分别于治疗后第3、9、24天监测气体交换情况。测定生长参数、叶绿素含量、叶片叶绿素荧光、地上部和根部Cd含量。幼苗生长、气体交换、叶绿素含量、叶绿素荧光参数普遍受到Cd胁迫的抑制，尤其是在高Cd浓度下。地上部和根部的Cd浓度和积累量均随外界Cd浓度的增加而增加。校正后的生长参数、光合作用参数和荧光参数与校正后的地上部和根部Cd浓度之间的关系可用回归模型Y=K/(1+exp(a+bx))来解释。从叶绿素含量、光合作用和叶绿素荧光等指标来看，京411具有较强的耐镉能力，Cd从根向地上部的转运较少。扬麦10号地上部和根部镉含量较高，从大部分生长参数来看，该品种是一个相对耐镉的品种。
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.