旱稻主要农艺性状与产量相关及通径分析

Correlation Between Grain Yield and Main Agronomic Traits of Upland Rice

分析了139份旱稻种质的主要农艺性状与产量之间的多元相关性、通径关系及回归关系,估测了旱稻10个主要农艺性状对产量影响的相对重要性。结果表明,实粒数、结实率、穗粒数、剑叶长和穗长与产量达极显著正相关;剑叶长、有效穗数、结实率和实粒数与产量的关系最密切,对产量起较大的正向直接作用,且以结实率>穗粒数>剑叶长>有效穗数。综合评价,应主要根据有效穗数多、穗粒数多、结实率高和剑叶较长等农艺性状,进行旱稻高产选育种。

An analysis were conducted of the correlation, path analysis and stepwise regression between the main agronomic traits and grain yield of 139 accessions of upland rice. Relative importance of 10 main agronomic traits contributed to the grain yield was estimated. The agronomic traits, i.e. filled grains per panicle, seed setting rate, total grains per panicle, flay leaf length, and panicle length, were found to be closely related with the grain yield. The stepwise regression analysis showed that flay leaf length, effective panicle per plant, seed setting rate and filled grains per plant had higher positive direct effect on the grain yield in the order of direct path coefficient of seed setting rate 〉 total grains per panicle 〉 flay leaf length 〉 effective panicle per plant. It is concluded that agronomic traits of rice such as more effective panicles per plant, more total grains per panicle, higher seed setting rate and longer flay leaf length be taken account of in the breeding programme for high yielding upland rice.