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作者在一个冬大麦(Hordeum vulgare L.)群体中评定了轮回选择的效应。用六个高产冬大麦品种与矮秆品种‘Onice’杂交创造出零轮回(即基础群体C_0)。将其F_1按双列杂交方案(不包括反交)进行杂交,共获得750个S_0植株并进行了评定,从中选出329个S_0植株并测验其后代(S_1系);从模仿随机交配产生的105个F_1杂种中选出15个S_1系作为第一轮(C_1)的亲本。然后,在两个点上随机选择C_0的103个S_1系和103个C_1的S_1系进行评定。试验观察到两轮选择间的籽粒产量有显著差异。从C_0到C_1,籽粒产量增加了307克/米~2(折合每公顷增加3.07吨)。其增加的产量是由于每平方米粒数的增加所致。两轮选择间,在株高、抽穗期和千粒重上无差异。本研究的明确结果表明,轮回选择在培育高产的亲本或品系(这些亲本或品系在其他重要农艺性状方面的变化不大)上是有潜力的。
The authors evaluated the effect of cycling selection in a group of winter barley (Hordeum vulgare L.). Crossing with the dwarf cultivar ’Onice’ with six high-yielding winter barley cultivars resulted in zero-cycle (ie, base population C_0). A total of 750 S 0 plants were obtained by crossbreeding with F_1 (excluding reciprocal crosses). 329 S_0 plants were selected and tested for their offspring (S_1 line); from random mating Fifteen out of 105 F_1 hybrids were selected as the first round (C_1) parents. Then, 103 S_1 lines of C_0 and 103 S_1 lines of C_1 were randomly selected at two points for evaluation. The experiment observed significant differences in grain yield between the two rounds of selection. From C_0 to C_1, grain yield increased by 307 g / m 2 (equivalent to an increase of 3.07 tonnes per hectare). The increase in yield is due to the increase in grains per square meter. Two rounds of selection, no differences in plant height, heading date and grain weight. The clear results of this study indicate that the recurrent selection potential is to breed high-yielding parents or lines that do not change much in other important agronomic traits.