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Initiating maize pre-breeding programs using genomic selection to harness polygenic variation from landrace populations

机译:利用基因组选择启动玉米预育计划以利用地方品种的多基因变异

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摘要

BackgroundThe limited genetic diversity of elite maize germplasms raises concerns about the potential to breed for new challenges. Initiatives have been formed over the years to identify and utilize useful diversity from landraces to overcome this issue. The aim of this study was to evaluate the proposed designs to initiate a pre-breeding program within the Seeds of Discovery (SeeD) initiative with emphasis on harnessing polygenic variation from landraces using genomic selection. We evaluated these designs with stochastic simulation to provide decision support about the effect of several design factors on the quality of resulting (pre-bridging) germplasm. The evaluated design factors were: i) the approach to initiate a pre-breeding program from the selected landraces, doubled haploids of the selected landraces, or testcrosses of the elite hybrid and selected landraces, ii) the genetic parameters of landraces and phenotypes, and iii) logistical factors related to the size and management of a pre-breeding program.
机译:背景玉米优良种质的有限遗传多样性引起了人们对新挑战育种潜力的担忧。多年来,已经形成了各种举措,以识别和利用本地人的有用多样性来克服这一问题。这项研究的目的是评估拟议的设计,以便在发现种子(SeeD)计划内启动预育计划,重点是利用基因组选择从地方品种中利用多基因变异。我们用随机模拟评估了这些设计,以提供关于几个设计因素对所得(预桥接)种质质量的影响的决策支持。评估的设计因素是:i)从选定的地方品种,选定的地方品种的双倍单倍体或优良杂种和选定地方品种的种系杂交开始预育计划的方法,ii)地方品种的遗传参数和表型,以及iii)与预育计划的规模和管理有关的后勤因素。

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