大穗小麦品系产量与主要农艺性状的相关性及通径分析

为给大穗型小麦新品种选育提供依据,以生产上大面积推广的西农979为对照品种,对参加2009年度陕西省小麦品种预备试验和2010年度小麦区域试验的8个具有高产特征的大穗型小麦新品系的主要农艺性状、产量及产量性状间的相关性进行了分析。结果表明,8个新品系除单位面积穗数外,其他农艺性状均明显高于多穗型品种西农979;品系2036、2037、2038、2039和2040产量均高于西农979;在农艺性状中,单位面积穗数和穗粒重与产量相关性较大,穗粒重和地上部生物量对产量分别产生较大的直接正效应和负效应;可通过协调大穗型小麦各节间长度和合理密植,提高单位面积穗数来弥补大穗小麦分蘖成穗率低的不足。

Correlation and Path Analysis of Yield with Major Agronomic Traits of Big head Wheat Lines

Using Xinong 979,a wheat variety planted in large production areas,as the control variety,this study was carried out to investigate the correlations between yield and main agronomic traits of eight new high-yield and big-head wheat lines from the 2009 Shaanxi Provincial Wheat Variety Pretest and 2010 Wheat Variety Regional Test.The results showed that: the eight new lines were remarkably lower than Xinong 979 in spike number per unit area,but significantly higher than Xinong 979 in the other agronomic traits;the yield of new lines 2036,2037,2038,2039 and 2040 lines was higher than that of the control.The yield of the lines was more closely correlated with spikes number per unit area and kernel weight;and the aboveground biomasses of the new lines had negative effects on their yield.With the lengths of all internodes properly regulated and the proper planting densities adopted,the new lines could get their spike numbers per unit area increased,thereby getting their yield traits optimized.