重金属镉对8个水稻(Oryza sativa L.)品种(系)萌发和出芽生长的影响

The effect of heavy metal cadmium on germination and post-germination growth of eight rice varieties

为了探明不同水稻品种间抗镉能力差异及不同镉胁迫水平对水稻种子萌发和出芽生长的影响,对轻、中、重度镉胁迫下8个水稻品种(系)萌发和出芽生长间的相关性状指标进行收集,并通过聚类分析法进行分析评价.结果表明:不同水稻品种抗镉能力存在较大差异.轻度镉胁迫对水稻萌发的影响,更多的体现为对水稻种子活力的单抑制效应,该水平下的综合性状表现更符合相关性拟合曲线,适合用于抗镉品种的筛选.水稻出芽期间受镉胁迫影响最大的是转绿时间和根系生长.三个杂交水稻主要亲本(保持系岗46B、Ⅱ-32B和恢复系成恢3203)都属于高抗型,三个常规籼稻品种(桂朝2号、桂育7号及五山丝苗)都属于敏感型.

To explore the differences of cadmium resistant ability among rice varieties and the eftects oi cadrmum stress at different levels on their germination and post-germinating growth, the related phenotypic indices of eighty varieties under low, moderated and high stress levels, respectively, were collected and analyzed by cluste- ring methodology. The results showed that there was a great difference in the ability to resist cadmium in differ- ent rice varieties. The effect of mild cadmium stress on rice germination was more reflected by the single inhibi- tory effect on seed vigor. The comprehensive characters at this level were more consistent with the correlation fitting curve, which was suitable for screening cadmium resistant varieties. The most effects of cadmium stress during rice germination were the green time and root growth. The three hybrid rice parents （maintainer lines Gang 46B, II-32B and restorer line Chenghui 3203） belonged to the high resistant type, the three classic indica rice varieties （Guichao 2, Gui Yu 7 and Wushansimiao） were sensitive.