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本文通过对西藏30个品种(系)6个主要农艺性状与产量的相关和通径分析。结果表明:仅产量因素与产量相关性到达显著,其相关程度为:每公顷有效穗数(0.7228)>千粒重(0. 5331)>穗粒数(0.4328);对产量的直接影响为:每公顷有效穗数(1.0215)>每穗粒数(0. 8321)>千粒重(0.7521)>生育期(0.2064)>株高(0.0473),穗长对籽粒产量表现为较小的负效应。根据上述分析及本地区小麦生态条件的特点,提出西藏小麦高产育种策略应增加有效分蘖数、稳定千粒重、挖掘穗粒数的潜力,并努力协调好三者的关系,寻求三因素乘积最大的最佳遗传模型,同时还应选择生育期适中的品种。
Through the correlation and path analysis of six main agronomic traits and yield of 30 cultivars (lines) in Tibet, The results showed that the correlation between yield factors and yield reached significant only, the correlation degree was: the effective panicle per hectare (0.7228)> 1000 grain weight (0.55331)> the grain number per ear (0.4328); the direct impact on the yield was: Spike number per spike (1.0215)> grain number per spike (0. 8321)> 1000 grain weight (0.7521)> growth period (0.2064)> plant height (0.0473). The spike length had a minor negative effect on grain yield. Based on the above analysis and the characteristics of wheat ecological conditions in the region, this paper proposed that the strategy of high-yielding wheat breeding in Tibet should increase the effective tiller number, stabilize the 1000-grain weight and tap the potential of grains per spike, and strive to coordinate the relationship among the three, seek the maximum of the three factors Good genetic model, should also choose the moderate growth of varieties.