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首页> 外文期刊>Pakistan journal of botany >Genetic parameter estimation for agronomic traits in grain-only and forage-plus-grain winter wheat systems
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Genetic parameter estimation for agronomic traits in grain-only and forage-plus-grain winter wheat systems

机译：仅谷物和牧草加粮冬小麦系统农艺性状的遗传参数估计

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Dual purpose winter wheat utilized for both livestock forage and grain yield is frequently grown throughout the Southern Great Plains of USA, yet no cultivars to date were bred specifically under a dual-purpose management system. This research was initiated to determine whether breeders should select winter wheat genotypes in a forage-plus-grain system, or continue the current practice of indirect selection in the grain-only system. Thirty-seven random winter wheat lines were evaluated in three experiments for 3 yr at the North Central Research Station, Lahoma, OK. Each experiment represented either an early-planted forage-plus-grain (FG) system, a normal-planted grain-only (GO) system, or a forage-plus-grain control (FGC) system, in which the forage was not removed. To simulate continuous grazing, the FG experiments were mechanically clipped three to four times from November until first-hollow-stem development in late-February. Though significant genetic variation was observed among wheat lines for all traits under each system, the genotype × system interactions were not significant due to strong genetic (rG0.94) and phenotypic (rP0.71, P 0.01) correlations. Genetic variances and heritability estimates for all traits were equal to or slightly higher in the GO system than those in FG and FGC systems. Indirect selection in the GO system was as effective as direct selection for trait improvement in the FG system. It is concluded that separate selection of wheat genotypes should not be applied in FG and GO systems.
机译：用于美国牲畜饲料和谷物产量的双重目的冬小麦通常在美国南部大平原上种植，但迄今为止，还没有在双重目的管理体系下专门培育任何品种。这项研究的开始是为了确定育种者是应该在饲草加粮系统中选择冬小麦基因型，还是继续目前仅谷物系统中间接选择的做法。在俄克拉荷马州拉霍马市的北部中央研究站进行的3年实验中，对37个随机的冬小麦品系进行了为期3年的评估。每个实验都代表一个早期种植的饲草加谷物（FG）系统，常规种植的仅谷物（GO）系统或不除去草料的饲草加谷物对照（FGC）系统。为了模拟连续放牧，从11月直到2月下旬出现第一个空心茎的过程，将FG实验进行了3到4次机械修剪。尽管在每个系统下所有性状的小麦品系之间都观察到了显着的遗传变异，但由于强的遗传（rG> 0.94）和表型（rP> 0.71，P <0.01）的相关性，基因型×系统的相互作用并不显着。 GO系统中所有性状的遗传变异和遗传力估计值均等于或略高于FG和FGC系统中。 GO系统中的间接选择与FG系统中性状改良的直接选择一样有效。结论是，在FG和GO系统中不应该单独选择小麦基因型。

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