摘要： 采用室内生物测定方法,研究了0.5 mmol/L镉(Cd)胁迫对贵州省主要栽培的32个水稻品种种子的萌发率、发芽指数、活力指数、根长、芽长和鲜质量的影响,并根据综合效应进行了评价。结果表明,Cd对种子发芽率影响较小,对发芽指数、活力指数、根、芽生长的影响显著,且对根的抑制效应大于芽;不同水稻品种种子萌发状况对Cd的响应存在较大的差异。应用快速聚类方法,根据综合效应可以将参试品种划分为耐受型、中间型和敏感型3种不同类型,其中耐性品种有中优5617、II优808、川江优3号,敏感品种有中优9801、冈优725、中优293、黔香优2000、金优425、宜香1979、宜香优101,其他为耐性中等品种。

关键词: 镉胁迫, 水稻, 种子萌发, 耐性

Abstract: In order to clear the response to Cd of different rice varieties, this paper investigated the effects of cadmium( 0.5 mmol/L) on the germination rate, germination index, vigor index, root length, shoot height and fresh weight of root and shoot of 32 rice varieties mainly cultivated in the province of Guizhou by the techniques of laboratory bioassay, and assessed the cadmium-resistant ability of rice by the synthetical effect.The results showed that after treated with 0.5 mmol/L cadmium, seed germination rate was less affected, but germination index, vigor index, root and shoot growth were restrained evidently.Cadmium had more serious impact on root than on shoot.Different rice varieties had different germination responses to cadmium.Based on their responses to cadmium, the test 32 varieties were clustered into 3 types, ie, tolerant type,medium type, and sensitive type.Zhongyou 5617, II-you 808 and Chuanjiangyou 3 were tolerant to Cd and the sensitive varieties include Zhongyou 9801,Gangyou 725,Zhongyou 293,Qianxiangyou 2000, Jinyou 425,Yixiang 1979 and Yixiangyou 101．

Key words: Cadmium stress, Rice, Seed germination, Tolerance

中图分类号: 

• S511

• Q945