镉对水稻种子萌发的影响

以不同类型的319个水稻品种为研究对象，研究了10 mg·L^-1 Cd²⁺处理对水稻种子萌发的影响.结果表明:Cd²⁺对种子发芽率影响较小，对根系生长的影响显著，且大于对芽生长的影响；不同类型水稻种子萌发对Cd的响应差异较大，敏感顺序为粳稻>籼稻>杂交稻；两系不育系根系长度和根系数量受Cd的抑制程度显著高于三系.应用快速聚类方法，可以将参试品种划分为耐受型、中间型和敏感型3种不同的敏感类型.

Effects of cadmium on rice seed germination.

With 319 rice varieties as test objects, this paper studied the effects of cadmium on their seed germination. The results showed that after treated with 10 mg x L(-1) of Cd2+, seed germination rate was less affected, but root growth was restrained evidently. Cadmium had more serious impact on root than on sprout. Different rice varieties had different germination responses to Cd2+, with the sequence of conventional rice (Japonica rice) > hybrid rice (Indianica rice) > conventional rice (Indianica rice). The root length and number of two-line sterilities were restrained more strongly than those of three-line sterilities. Based on their responses to Cd2+, the test 319 varieties were clustered into 3 types, i.e., endurant type, medium type, and sensitive type.