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首页> 外文学位 >Genetic improvement of biomass yield in upland switchgrass (Panicum virgatum L.) using secondary plant morphological traits.
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Genetic improvement of biomass yield in upland switchgrass (Panicum virgatum L.) using secondary plant morphological traits.

机译：利用次生植物形态性状遗传改良旱生柳（Panicum virgatum L.）生物量产量。

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摘要

Switchgrass (Panicum virgatum L.) is currently undergoing intensive breeding efforts to improve biomass yield. Direct selection for biomass yield in switchgrass has proven difficult due to the many factors influencing biomass yield. In developing breeding schemes for increasing biomass yield, consideration must be made to the relative importance of spaced plantings to sward plots for evaluation and selection. 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. This research sought to identify secondary morphological traits in parental plants that are predictive of biomass yield in progeny swards, estimate heritability of secondary morphological traits and empirically test the effects of direct selection for secondary morphological traits on biomass yield. Limited predictive ability was observed for sward biomass yield using individual and combinations of plant morphological traits. A comparison of models using a Bayesian model averaging approach revealed common traits among the best predictive models including plant height, single-plant dry biomass, and second leaf width. Predictions of single-plant biomass, using the same set of morphological traits, revealed a large effect for tillering related traits. Moderate heritability was estimated for plant height and was greater for selection of increased height. Heritability for tiller count was low overall, with greater values observed for reduced tillering selections. Flowering date was estimated to have high heritability overall in both selection directions. 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 non-selected 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. Results of this research demonstrate the challenges of selecting for increased biomass yield in switchgrass within spaced-plant nurseries. Based on these results it is recommended that greater emphasis be placed on evaluation biomass yield within sward plots for improving biomass yield.
机译：柳枝（（Panicum virgatum L.）目前正在进行集约育种努力，以提高生物量的产量。由于许多影响生物量产量的因素，直接选择柳枝biomass的生物量产量已被证明是困难的。在制定提高生物量产量的育种方案时，必须考虑间隔种植对草地进行评估和选择的相对重要性。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。这项研究试图在亲本植物中鉴定出可预测子代生物量产量的次要形态性状，估算次要形态性状的遗传力，并实证检验直接选择次要形态性状对生物量产量的影响。使用植物形态性状的个体和组合观察到的草地生物量产量的预测能力有限。使用贝叶斯平均模型进行的模型比较显示，最佳预测模型的共同特征包括植物高度，单株干生物量和第二叶宽度。使用相同的一组形态性状对单株生物量进行的预测揭示了分till相关性状的巨大影响。估计植物株高的中等遗传力，选择增加株高的遗传力更高。总体而言，分er计数的遗传力较低，对于减少的分till选择，观察到较大的值。据估计，在两个选择方向上总的开花日期具有较高的遗传力。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。这项研究的结果表明，在间隔苗圃的柳枝switch中选择提高生物量产量的挑战。根据这些结果，建议在草地上更加重视评估生物量，以提高生物量。

著录项

  • 作者

    Price, David L.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Biology Genetics.;Agriculture Plant Culture.;Agriculture General.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 87 p.
  • 总页数 87
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:41:04

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