籼型杂交水稻低温障碍型耐冷性研究  

Characteristics of cold tolerance in Indica hybrid rice varieties with low temperature obstruction

作　　者：阮仁超 陈惠查 游俊梅 周介雄 李其义 王朝刚 

机构地区：[1]贵州省水稻研究所,贵州贵阳550006 [2]贵州省种子管理总站,贵州贵阳550002 [3]贵州省贵阳乌当区新场乡农业服务中心,贵州贵阳550011

出　　处：《西南农业学报》2007年第6期1157-1161,共5页Southwest China Journal of Agricultural Sciences

基　　金：贵州省科学技术基金项目(20033204);农业部作物种质资源保护项目[NB06-070401(22-27)-01-09];国家科技基础条件平台项目(2005DKA21001-01-07);贵州省"十一五"水稻科技攻关项目(20053005)

摘　　要：采用自然低温胁迫和开花期人工低温处理对6个籼型杂交水稻品种的障碍型耐冷性进行了鉴定评价。结果表明，田闻分期播种下，供试种受低温胁迫后的结实率随播期延迟呈逐渐下降趋势，但品种间降幅不一。其中，Ⅱ优838、Ⅰ优4761和金优431的降幅较小，其相对冷敏指数（CRI）在1．52％～11．32％，表现对低温胁迫相对迟钝，而冈优725、汕优63和K优5号种在不同播种期间随胁迫强度增大结实率降幅增大，CRI值在3．05％～46．30％，表现对低温胁迫相对敏感。开花期人工低温处理不同目数后的结实变化与自然低温胁迫结果基本一致。对Ⅳ期播种的各品种在自然低温下的结实率与开花期18和20℃胁迫处理后CRI值的相关性分析，存在显著或极显著正相关。与18℃处理3、5、7d的相关系数分别为0．3116、0．8409^＊＊和0．9362^＊＊，与20℃处理3、5、7d的相关系数分别为0．4480^＊、0．8565^＊＊和0．8083^＊＊。由此表明，2种方法均可有效评价籼型杂交水稻的障碍型耐冷性。The cold tolerance was one of important targets as well as characteristics for breeding of hybrid rice in China,especially in higher altitude regions. The cold tolerance of 6 Indica hybrid rice varieties with low temperature obstruction was identificated under the natural field cold stress and artificial low temperature stress at blooming stage. The results showed that the setting rate of tested varieties gradually declined with delay of sewing time under split sowing in fields, but there was difference in the decline range among them. The cold relative index of ll You 838,1 You 4761 and Jinyou 431 was 1.52 % - 11.32 % （ lower decline range, insensitiveness to cold stress）, while the cold relative index of Gangyou 725, Shanyou 63 and Kyou 5 was 3.05 % -46.30 % （higher decline range, sensitiveness to cold stress） under natural field cold stress. There was no difference in change of setting rate between the artificial low temperature stress and natural field cold stress at blooming stage. There was a significant correlation or very significant correlation between setting rate under natural field cold stress and CRI value under 18 and 20℃ stress at blooming stage in different tested varieties sowed at Ⅳ date,and their correlation coefficients between setring rate and CRI value under 3,5 and 7d of 18℃ stress were 0.3116,0. 8409 ^＊ ＊ and 0. 9362 ^＊＊ and the correlation coefficients between setting rate and CRI value under 3,5 and 7 d of 20℃ stress were 0. 4480 ＊ ,0. 8565 ^＊ ＊ and 0. 8083 ^＊＊ , respectively. The cold tolerance of indica hybrid rice varieties with low temperature obstruction could effectively be evaluated by two methods.

关 键 词：耐冷性 籼型杂交水稻 障碍型冷害 评价 相对冷敏指数 

分 类 号：S511.21[农业科学—作物学]