鸡冠花(Celosia cristata Linn)对Cs和Sr的胁迫反应及其积累特征

通过水培试验研究了不同浓度133Cs和88Sr对鸡冠花(Celosia cristata Linn)幼苗株高、根长、叶绿素和丙二醛等的影响及植株对2种元素的积累特征。结果表明,低浓度(0.1和0.5mmol/L)133Cs和88Sr处理下,鸡冠花幼苗的株高和根长与对照无显著差异,但高浓度(1.0和5.0mmol/L)的133Cs和88Sr会抑制其生长;鸡冠花幼苗的叶片、茎段和根部干重随着133Cs和88Sr处理浓度的增加而减少。133Cs和88Sr在鸡冠花幼苗体内的分布均为根部茎段叶片。随核素133Cs和88Sr浓度的上升,鸡冠花幼苗叶绿素含量均呈先升再降趋势,而MDA含量呈先降后升趋势。

RESPONSE OF Celosia cristata Linn TO Cs AND Sr STRESS AND THEIR ACCUMULATION CHARACTERISTIC

Plant height,  root length, chlorophyll, MDA and accumulating characteristics of Celosia cristata Linn were measured after treated with different concentrations of 133Cs and 88Sr in the hydroponic condition. The results showed that the stem and root length of cockscomb plants had no significant change under low concentrations of 133Cs and 88Sr treatment (0.1 and 0.5 mmol/L), but the plant growth were inhibited under high level of 133Cs or 88Sr (1.0 and 5.0 mmol/L). The dry weight of leaf, stem, root of cockscomb plant decreased with the increase of 133Cs and 88Sr concentration. The concent of chlorophyll in plants increased first and declined, the change of  MDA content showed a reverse variation. The distribution of 133Cs and 88Sr in cockscomb plants followed the order of root＞stem＞leaf.