不同镉耐性水稻品种资源的筛选

Screening of Oryza sativa varieties with different cadmium tolerances

为筛选出不同镉耐性的水稻品种,收集了238份我国南方4省主栽的水稻种质资源.通过分析不同浓度镉处理的种子萌发及幼苗生长指标,发现镉污染显著抑制水稻种子萌发和幼苗生长,不同水稻品种的镉耐性存在显著差异;通过系统聚类,初步筛选出高耐性水稻品种43个、低耐性水稻品种67个;通过复筛获得了稳定的高镉耐性水稻品种4个(金丝软占、宜优673、福龙优两优6387和特优671),低镉耐性水稻品种8个(T两优明占、Y两优837、百香139、丰田优553、广8优165、过山香、两优688、隆两优1377).研究结果为水稻镉污染适应机制研究及镉低积累水稻育种提供一定基础.

In order to screen rice varieties with distinct cadmium(Cd)tolerances,238 rice varieties,widely extended in China′s southern areas of Guangdong,Guangxi,Fujian and Zhejiang,were subject to different levels of Cd stress and evaluated upon seed germination indexes and seedling growth indexes.Primary results showed that the rice varieties differed in Cd tolerance.Based on hierarchical cluster analysis,they were divided into 43 varieties with high tolerance and 67 varieties with low tolerance.Then 12 varieties with stable Cd tolerance were obtained after secondary screening,including 4 varieties with stably high Cd tolerance‘Jinsiruanzhan’,‘Yiyou 673’,‘Fulongyouliangyou 6387’and‘Teyou 671’and 8 varieties with stably low Cd tolerance‘T-liangyoumingzhan’,‘Y-liangyou 837’,‘Baixiang 139’,‘Fengtianyou 553’,‘Guang 8 you 165’,‘Guoshanxiang’,‘Liangyou 688’and‘Longliangyou 1377’.The study was contributed to the unveiling of the adaptation mechanism underlying Cd pollution in rice and the breeding of low Cd-accumulation rice varieties.