锰-镉互作对水稻生长和植株镉、锰含量的影响

在水培条件下,设置不同水平锰、镉处理,研究了锰对镉胁迫下水稻生长及植株镉、锰、铁、锌含量的影响。在镉胁迫下,正常锰处理(约0.50mg/L)可显著缓解镉对水稻生长的抑制,表现为株高、根长、叶绿素(a、b)含量等参数均高于低锰处理。随着镉处理水平的提高,水稻根系与地上部的镉含量随之上升;在同一镉处理水平下,植株地上部和根系镉含量因培养液中锰水平不同而异:随着锰处理水平的增加,水稻根系中的镉含量下降,而地上部镉含量则显著增加。随着锰、镉处理水平的提高,水稻植株地上部和根系中的铁、锌含量显著下降。此外,还对锰控制水稻镉积累的机理及其利用价值进行了讨论。

Effects of Interaction Between Manganese and Cadmium on Plant Growth and Contents of Cadmium and Manganese in Rice

The effects of Mn treatment on rice growth,and Cd,Mn,Fe and Zn contents and their distribution in shoots and roots under Cd stress were investigated under hydroponics.The results showed that Cd toxicity to rice plants was markedly alleviated at normal Mn level (about 0.50 mg/L) with higher plant height,root length,and contents of chlorophyll a and chlorophyll b than at low Mn level.With the rising Cd concentration in culture solution,the Cd contents in shoots and roots increased.Under the same Cd level,the ...