极端冷害下粳稻穗期近等基因系耐冷性状的相关分析*

 用耐冷性极强的地方稻种与十和田研制的近等基因系（NILs）及亲本共29份，2004年在云南省农业科学院（低田温冷泉水）和嵩明阿子营两种极端冷害条件下进行孕穗期耐冷性鉴定，考查了17个农艺性状，用SPSS软件进行分析，结果表明：（1） 极端冷害下23份NILs的结实率超过轮回亲本十和田（0.47%）,超过十和田10%的NILs共有14份,如昆明小白谷与十和田配制的TKB₆F₆（44.2%），结实率不但高于十和田而且接近昆明小白谷; （2）昆明点结实率与穗颈长（0.878^**）、实粒数（0.977^**）、秕粒数（-0.879^**）、花药体积（0.851^**）呈极显著相关；（3）阿子营点结实率与株高（0.612^**）、穗颈长（0.511^**）、第一节长（0.544^**）、实粒数（0.958^**）呈极显著相关。

Correlation Analysis on Traits Related Cold Tolerance in NILs in Japonica Rice at Booting Stage under Extremely Cold Damage

Twenty-nine rice geneotypes, including near-isogenic lines (NILs) and their parents,were grown in field experiments in Kunming and Aziying,Yunnan, China and analyses were made of their agronomic traits with SPSS software. It was showed that: (1) Under extremely cold damage, the seed setting rate of twenty-three NILs was higher than donor parent Shihetian(0.47%). And 14 of them were higher 10% than Shihetian, For example, TKB_6F_6(44.2%) was not only higher Shihetian but also close Kunming Xiaobaigu; (2) in Kunming ,seed setting rate was related significantly with spike neck length(0.878~(**)),full grains(0.977~(**)),blighted grains (-0.879~(**)),anther volume(0.851~(**)). (3)in Aziying, seed setting rate was related significantly with plant height(0.612~(**)),spike neck length(0.511~(**)),first node length(0.544~(**)),full grains(0.958~(**)).