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首页> 外文学位 >Estimation of genetic parameters in several switchgrass (Panicum virgatum L.) populations.
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Estimation of genetic parameters in several switchgrass (Panicum virgatum L.) populations.

机译：几种柳枝（（Panicum virgatum L.）种群的遗传参数估计。

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摘要

Scope and method of study. The objectives of this study were to determine: (1) the effects of high- and low-biomass yield environments on plant selection in breeding switchgrass for enhanced biomass yield using recurrent selection, and (2) genetic variances, narrow-sense heritability (h2n), and predicted genetic gain (DeltaG) from selection procedures for increased biomass yield in two populations (SL 93 & NL 94) of lowland ecotype switchgrass and two populations (SNU-EM & SNU-LM) of upland ecotype switchgrass. For objective 1, Co parent plants were selected for biomass yield based on performance of their half-sib (HS) progeny evaluated under high- and low-yield environments for 1 year. Yield performance of C1 HS families was assessed under both high-and low-biomass yield environments for 3 years. For objective 2, HS families and their clonal parent plants for the respective populations were evaluated in replicated field tests over 2 to 3 years. Genetic variance components for biomass yield were estimated for the respective populations and narrow-sense heritability (h2n) estimates were derived using variance component estimates and by progeny-parent regression.; Findings and conclusions. The results suggested that breeding gains may be higher when parent plant selection is based on HS progeny performance under a low yield environment. Significant magnitudes of genetic variation for biomass yield were found in the SL 93 and NL 94 populations, but not in the SNU-EM and SNU-LM populations. The h2 n estimates varied in magnitude with population and method of calculation. Positive response to selection for higher biomass production was indicated in the NL 93 and NIL 94 populations based on estimated magnitudes of genetic variation and h2n. Low amounts of genetic variation for biomass yield in the SNU-EM and SNU-LM populations predicted low, or no, response to selection, although some estimates of the additive genetic component of the available variation were of moderate to high magnitudes.
机译：研究范围和方法。这项研究的目的是确定：（1）高生物量和低生物量产量环境对育种柳枝plant中植物选择的影响，从而通过轮回选择提高生物量产量；（2）遗传变异，狭义遗传力（h2n ），以及从选择程序中预测的遗传增益（DeltaG），以提高低地生态型柳枝switch两个种群（SL 93和NL 94）和两个高地生态型柳枝switch种群（SNU-EM＆SNU-LM）的生物量产量。对于目标1，根据在高产量和低产量环境下评估的半同胞（HS）后代的性能，选择一年生的同系亲本。在高生物量和低生物量产量环境下，对C1 HS家族的产量表现进行了3年的评估。对于目标2，在2至3年的重复田间试验中评估了各个种群的HS家族及其克隆亲本植物。估计了各个种群的生物量产量的遗传方差分量，并使用方差分量估计和后代-父母回归推导了狭义遗传力（h2n​​）估计。结论和结论。结果表明，当亲本植物的选择基于低产量环境下的HS后代表现时，育种收益可能会更高。在SL 93和NL 94种群中发现了生物量产量的遗传变异幅度，但在SNU-EM和SNU-LM种群中却没有。 h2 n估计的大小随人口和计算方法的不同而不同。根据遗传变异和h2n的估计值，NL 93和NIL 94种群表明对选择更高的生物量产生积极反应。 SNU-EM和SNU-LM种群中生物量产量的遗传变异数量少，预测对选择的反应低或没有，尽管对可用变异的附加遗传成分的某些估计为中等到高。

著录项

  • 作者

    Rose, Louis Walker, IV.;

  • 作者单位

    Oklahoma State University.;

  • 授予单位 Oklahoma State University.;
  • 学科 Agriculture Plant Culture.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 118 p.
  • 总页数 118
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 作物生物学原理、栽培技术与方法;
  • 关键词

  • 入库时间 2022-08-17 11:42:18

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