镉在小麦植株体内的吸收、分配和累积规律研究

Studies on Uptake,Distribution and Accumulation of Cd in Wheat Plant

通过大田试验 ,研究镉 (Cd)在麦株中的吸收、分配和累积的动态变化规律。结果表明 ,小麦植株中较易富集Cd2 +的部位是叶、根及废弃物 ,而籽粒中Cd2 +水平较低 ;Cd2 +是一种不可移动的元素 ,在衰老部位累积较多 ,不能被其他未衰老的器官重新利用 ;Cd2 +吸收量与植株干物重增加量呈极显著的正相关 (r=0 .91 6 ) ,吸收速率与植株干物重增加量呈显著的正相关 (r=0 .80 0 ) ;灌浆期和拔节—抽穗期是镉污染控制的关键时期 ,且Cd2 +吸收量最高 ,Cd2 +吸收速率也最大。

studies with wheat variety Zhengmai 9023 in field tests in 2002-2003 showed that leaves,roots and wastes were the organs in wheat of gathering Cd 2+ easily, but there was very little Cd 2+ in grains.Cd, a non-moving element, was accumulated more in aged organs, and could not be used again by fresh organs. There was a very significant correlation between the uptake amount of Cd 2+ and the increasing amount of biomass (r=0.916 ** ).There also was a significant correlation between the uptake speed and the increasing amount of biomass (r=0.800 *). These two stages, filling stage and jointing-heading stage,were key,stages in which Cd pollution could be controlled with the highest uptake amount and the biggest uptake speed of Cd 2+ .