Plant breeders should be determining economic weights for a selection index instead of using independent culling for choosing parents in breeding programs with genomic selection

Plant breeders should be determining economic weights for a selection index instead of using independent culling for choosing parents in breeding programs with genomic selection
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植物育种者应该确定选择指数的经济权重,而不是在基因组选择育种计划中使用独立剔除来选择亲本

DOI:
10.1101/500652
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发表时间:
2018
期刊:
--
影响因子:
--
通讯作者:
Batista L
Batista L
中科院分区:
--
文献类型:
--
作者:
Batista L

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在基因组选择的背景下,我们使用指数选择或独立剔除来选择亲本来评估和比较循环选择育种计划。我们使用独立剔除或经济选择指数模拟了 20 个选择周期的克隆繁殖作物育种计划,其中两个不利相关性状处于选择状态。两种策略从杂交到选择亲本的周期时间保持相同。我们的结果表明,即使在进行独立扑杀时,准确了解性状的经济重要性也是至关重要的。这是因为当每个性状的剔除阈值根据性状的经济重要性而变化时,独立剔除实现了其最佳遗传增益。当独立剔除的收益最大化时,两种选择方法将遗传多样性转化为遗传收益的效率是相当的。当使用每个性状选择10%的相同比例代替最佳剔除水平时,当T2的相对经济重要性为1.0、2.5和5.0时,指数选择比独立剔除效率分别高10%、128%和310%。考虑到估计最佳剔除水平的复杂性以及独立剔除所获得的收益至多相当于指数选择的事实,建议使用经济选择指数进行多性状基因组选择。
In the context of genomic selection, we evaluated and compared recurrent selection breeding programs using either index selection or independent culling for selection of parents. We simulated a clonally propagated crop breeding program for 20 cycles of selection using either independent culling or an economic selection index with two unfavourably correlated traits under selection. Cycle time from crossing to selection of parents was kept the same for both strategies. Our results demonstrate that accurate knowledge of the economic importance of traits is essential even when performing independent culling. This is because independent culling achieved its optimum genetic gain when the culling threshold for each trait varied accordingly to the economic importance of the traits. When gains from independent culling were maximised, the efficiency of converting genetic diversity into genetic gain of both selection methods were equivalent. When the same proportion selected of 10% for each trait was used instead of optimal culling levels, index selection was 10%, 128% and 310% more efficient than independent culling when T2 had a relative economic importance of 1.0, 2.5 and 5.0, respectively. Given the complexity of estimating optimal culling levels and the fact that the gains achieved with independent culling are, at most, equivalent to index selection, the use of an economic selection index is recommended for multi-trait genomic selection.
DOI: 10.2135/cropsci1999.0011183x003900010003x
发表时间: 1999-01-01
期刊: CROP SCIENCE
影响因子: 2.3
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发表时间: 1983
影响因子: 5.4
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DOI: 10.1186/1297-9686-45-44
发表时间: 2013-10-30
期刊: Genetics, selection, evolution : GSE
影响因子: --
作者:
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发表时间: 1961
期刊:
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DOI: --
发表时间: 1989
期刊:
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