铅污染对3个水稻品种种子活力的影响

 以3个水稻品种（嘉育293、嘉育948、协优963）的种子为材料，研究了不同浓度的铅溶液对水稻种子的发芽及幼苗生长的影响，并在存在质量性状（品种）的情况下，采用质量型与数量型正交多项式结合的方法对水稻种子活力指标进行回归预测分析。结果表明，不同品种的水稻种子对铅毒害的敏感程度不同。在100～700 mg/L浓度条件下，铅对水稻幼苗根长和茎长存在显著的抑制作用，且其抑制程度随着浓度的提高而增加，但对根干质量和茎干质量却无显著的抑制作用，表明不同生理性状对铅的敏感程度不同。得到的回归预测方程能有效预测不同铅浓度对水稻种子活力的影响。

Effects of Pb Pollution on Seed Vigour of Three Rice Varieties

Seed germination and seedling development at different Pb concentrations in three rice varieties (Jiayu 293, (Jiayu) 948 and Xieyou 963) were investigted. The method of qualitative trait combining with quantitative trait by orthogonal polynomials was applied to analyze rice seed vigour by regression model. Seeds from different rice varieties showed different sensitivities to Pb poison. In the Pb concentration of 100-700 mg/L, Pb had significant inhibitory effects on root length and shoot height, and the restraint would aggravate along with the increase of Pb concentration. However, Pb had no inhibitory effect on root dry weight and shoot dry weight, indicating that different physiological characteristics had different sensitive reactions to Pb. The gained predicting equation of regression could predict the effects on rice seed vigour at different Pb concentrations.