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首页> 外文期刊>Bioenergy research >Divergent Selection for Secondary Traits in Upland Tetraploid Switchgrass and Effects on Sward Biomass Yield
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Divergent Selection for Secondary Traits in Upland Tetraploid Switchgrass and Effects on Sward Biomass Yield

机译：陆地四倍体柳枝Secondary次生性状的发散选择及其对草地生物量产量的影响

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摘要

Switchgrass (Panicum virgatum L.) is currently undergoing intensive breeding efforts to improve biomass yield. Consideration must be made regarding the relative importance of spaced plantings to sward plots for evaluation and selection for increased biomass yield. It has previously been suggested that selection schemes using secondary plant morphological traits as selection criteria within spaced plantings may be an efficient method of making genetic gain. The objective of this study was to empirically test the effects of direct selection for plant height, tiller count, flowering date, and visual selection for biomass yield within spaced plantings on biomass yield and morphology traits within sward plots. Divergently selected populations for each trait were developed from the WS4U upland tetraploid germplasm and evaluated for biomass yield at five locations in Wisconsin during two growing seasons. Significant variation was observed between maternal parents of the selected populations for both selected and nonselected traits. Despite substantial differences between parent plant populations for plant morphology, significant differences were not observed for sward-plot biomass yield or sward-plot morphology relative to the base population. Late flowering selections yielded 2.0 Mg/ha greater biomass than early flowering selections (29 % increase). Plant height within sward plots was observed to have a strong positive correlation with biomass yield. Tiller count was observed to have a weak correlation with biomass yield. Based on the observed results, it is recommended that greater emphasis be placed on evaluation of biomass yield using sward plots.
机译：柳枝（（Panicum virgatum L.）目前正在进行集约育种努力，以提高生物量产量。必须考虑间隔种植对草地进行评估和选择以增加生物量产量的相对重要性。先前已经提出，在间隔种植中使用次生植物形态性状作为选择标准的选择方案可能是获得遗传增益的有效方法。这项研究的目的是凭经验测试直接选择株高，分till数，开花日期和目视选择间隔种植中生物量产量对草地上生物量产量和形态性状的影响。从WS4U陆地四倍体种质中选出每个性状的不同种群，并在两个生长季节评估了威斯康星州五个地点的生物量产量。在选择的和未选择的性状上，在所选择的群体的父母之间观察到显着差异。尽管亲本植物种群之间在植物形态上存在显着差异，但与基础种群相比，草地图生物量产量或草地图形态均未观察到显着差异。开花后期的选择比早期开花的选择产生的生物量高2.0毫克/公顷（增加29％）。在草地上观察到的株高与生物量产量有很强的正相关。观察到分iller计数与生物量产量之间的相关性较弱。根据观察到的结果，建议更加重视使用草绘图评估生物量产量。

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