长江中下游早中熟两系早杂产量与主要经济性状分析

对2004~2008年国家南方稻区长江中下游早籼早中熟组区域试验中23个两系早杂组合的29组数据进行相关分析、偏相关分析、通径分析以及主成分分析,结果表明:穗实粒数、结实率与产量呈显著正相关,生育期与产量呈显著负相关,穗实粒数与有效穗呈极显著负相关;穗实粒数对产量的贡献率最大,有效穗次之。该作者认为长江中下游早中熟两系早杂,在适宜穗数的基础上,应着重选择大穗型、高结实率的组合,同时兼顾早熟性,这样更易获得高产。

Analysis on Yield and Major Economic Characters of Two-line Hybrid Early Indica Rice with Early-Middle Maturity in Mid-Lower Reaches of the Yangtze River

By correlation analysis,partial correlation analysis,path analysis and principle component analysis,this study analyzed the 29 groups data of 23 two-line hybrid early rice combinations,which were collected from the regional tests for the early indica early-middle maturing rice varieties in the mid-lower reaches of the Yangtze River in national southern rice region from 2004 to 2008.The results indicated that rice yield was significantly positively correlated with the filled grains per panicle and seed-setting rate,and was significantly negatively correlated with the growth and developmental duration.There was significantly negative correlation between the filled grains per panicle and the effective panicles(P<0.01).The filled grains per panicle had the greatest contribution to rice yield,followed by the effective panicles.The author considers that planting rice combinations with large panicle,high seed-setting rate,appropriate effective panicles and proper early maturity could easily obtain high yield for the two-line hybrid early indica rice with early-middle maturity in the mid-lower reaches of the Yangtze River.