【摘要】 用耐冷性极强的地方品种与十和田配制的NILs及亲本共84份材料,分别种在昆明和阿子营,通过相关和聚类分析,结果表明:(1)在昆明,结实率与花药长、倒二节长、实粒数、秕粒数之间相关系数较大,结实率、花药长、倒二节长、实粒数、秕粒数这几个性状与耐冷性的关系较密切。(2)在阿子营,结实率与花药长、株高、穗长、实粒数、秕粒数、总粒数之间相关达极显著水平,表明移栽至成熟期极端冷害下造成结实率降低,对整个植株生长发育均有抑制作用。(3)在昆明,84个材料18个性状聚类没有明显的类间区别,13个性状聚类可划分为2大类;在阿子营,78个材料8个性状聚类可划分为4类。(4)结实率作为耐冷性指标是较可靠的,在极端冷害下,可参考花药长等其他耐冷性指标。更多还原

【Abstract】 Eighty-four rice genotypes, including near isogenic lines (NILs) and their parents, were grown in field experiments in Kunming and Aziying, Yunnan, China and correlation and cluster analyses were made of their cold-tolerance and other agronomic traits. In Kunming, seed setting was correlated with anther length, second node length, well-filled grains and poorly-filled grains and cold tolerance of the plants was found to be closely associated with the above traits. In Aziying, seed setting was in highly significant correlation (P≤0.01) with anther length, plant height, spike length, well-filled grains and poorly-filled grains, suggesting that the extremely low temperature at the location inhibited the growth and development of the plants and thus resulted in low seed-setting. No distinct difference was observed in the cluster analysis among the 84 genotypes in 18 traits in Kunming while 78 genotypes were clustered into 2 major groups based on 18 traits in Kunming and into 4 groups in Aziying. Seed setting is presumed to be a reliable indicator of cold tolerance of rice varieties, and under extreme cold environment anther length and some other parameters should be taken into consideration.更多还原