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籽粒灌浆期（ＧＦＰ）可能是一个有用的生理学选择性状，它能够影响谷类作物的籽粒产量．本研究以６个遗传多样性的春小麦群体为试材，评估了ＧＦＰ的遗传力，确定了长ＧＦＰ和短ＧＦＰ的选择效应．在Ｆ２代进行选择并在Ｆ３代通过田间试验对选择后代进行重复评价．试验于１９９０年在尼泊尔的Ｒａｍｐｕｒ进行，采用正常播种和晚播两种处理．播期对ＧＦＰ、籽粒产量、生物学产量、收获指数、百粒重有明显的影响．Ｆ２中长、短ＧＦＰ的选择对于鉴定Ｆ３代的长短ＧＦＰ是有效的，而且选择长的ＧＦＰ通常会获得较高的籽粒产量和生物学产量。长ＧＦＰ系的平均收获指数、百粒重高于短ＧＦＰ系．ＧＦＰ的遗传力估计值属于中高类型（０．５２－０．８６）。ＧＦＰ与籽粒产量、收获指数和百粒重均呈正的遗传相关，相关系数分别为０．５２－０．７９、０．５０－０．８０和０．５３－０．７２．结果表明．在早代选择长ＧＦＰ可以改良上述产量因子。
Grain filling stage (GFP) may be a useful physiologically selectable trait that can affect grain yield in cereals. In this study, 6 genetic diversity of spring wheat population as a test material to assess the heritability of GFP to determine the long GFP and short GFP selection effect. Selection was made in F2 and repeated selection of selected offspring was conducted in field trials in F3. The experiment was conducted in Rampur, Nepal, in 1990, using both normal and late-sowing treatments. Sowing date had a significant effect on GFP, grain yield, biological yield, harvest index and grain weight. The selection of F2 long and short GFPs is effective in identifying GFP of F3 generation, and long GFP selection usually results in higher grain yield and biological yield. The average harvest index of long GFP lines is higher than that of short GFP lines. The heritability estimates for GFP are of high to moderate type (0.52-0.86). GFP showed a positive genetic correlation with grain yield, harvest index and 100-grain weight, with correlation coefficients of 0.52-0.79, 0.50-0.80 and 0.53-0.72, respectively. The results show. Choosing long GFP in the early generation can improve the above yield factors.