不同水稻品种群体质量与产量的通径分析

选取30个不同熟期的水稻品种为试验材料,测定有效穗数、穗粒数、结实率、千粒重、叶面积指数、源(叶)库(粒)比率、单茎茎鞘重和株高,采用通径分析方法,研究不同品种在一定的生态条件下其群体质量与产量的关系。结果表明:早熟品种有效穗数、穗实粒数对产量的直接影响显著大于晚熟品种,间接影响小于晚熟品种;早熟品种的结实率与产量的直接和间接通径系数分别为1.799和-0.893,晚熟品种分别为-0.231和1.085;两类型品种的叶面积与产量的直接通径系数分别为0.778和0.690,间接通径系数分别为-0.073和-0.016;早熟品种粒叶比与产量的直接通径系数为-0.369,而间接通径系数高达1.176,晚熟品种主要是直接作用(0.797),间接作用很小(0.016);早熟品种单茎茎鞘重与产量的直接和间接通径系数分别为0.274和0.254,但晚熟品种的直接通径系数为-0.33,间接通径系数为0.826;早熟品种和晚熟品种株高与产量的直接通径系数为-0.838和-0.799,间接通径系数分别为1.542和1.120,都大于直接影响。

Path analysis on population quality and yield of different rice varieties

In this study,30 rice varieties with different maturing periods were used as the plant materials,the effective panicle number,grain numbers per panicle,seed setting rate,1000-grains weight,leaf area index,sources(leaf) and sink(grain) ratio,single stem sheath weight and plant height were determined,and the relationship between the population quality and yield of different varieties under certain ecological condition was analyzed by path analysis.The results indicated that direct effects of effective panicle number,grain number per panicle on the yield of early maturing varieties were significantly higher than late maturing varieties,while indirect effects were less;the direct and indirect path coefficients of seed setting rate to yield of early rice were 1.799 and-0.893,respectively,and those of late rice variety was-0.231 and 1.085,respectively.The direct and indirect path coefficients of leaf area index to yield of two type rice varieties were 0.778 and 0.690,-0.073 and0.016,respectively.The direct path coefficients of sink and sources ratio to yield of early rice varieties were-0.369 and the indirect path coefficient was up to 1.176,while the direct path coefficient of late rice varieties was 0.797 and the indirect path coefficient was very low with 0.016.The direct and indirect path coefficients of single stem sheath weight to yield of earl rice varieties were 0.274 and 0.254,respectively,while those of late rice varieties were -0.33 and 0.826,respectively.Moreover,the direct path coefficients of plant height to yield of early and late rice varieties were negative with-0.838 and -0.799,respectively;while the indirect path coefficients of that were positive with 1.542 and 1.120,respectively,and higher than the direct path coefficients.