【摘要】：為揭示基因輔助最佳線性無偏預(yù)測(cè)(BLUP)方法在不同留種策略下的選擇效果,在假定目標(biāo)數(shù)量性狀同時(shí)受1個(gè)雙等位基因QTL和多基因共同控制的前提下,模擬了在一個(gè)閉鎖群體(10頭公畜、190頭母畜)內(nèi)采用標(biāo)記輔助BLUP連續(xù)選擇10代的情形。選擇試驗(yàn)共考慮了3種留種策略:策略Ⅰ僅根據(jù)個(gè)體估計(jì)育種值(EBV)高低留種;策略Ⅱ在每個(gè)公畜家系內(nèi)選留EBV最高的1頭公畜和19頭母畜;策略Ⅲ在每個(gè)公畜家系內(nèi)選留1頭EBV最高的公畜,在每個(gè)母畜家系內(nèi)選留EBV最高的1頭母畜。結(jié)果表明,留種策略Ⅰ的遺傳進(jìn)展(包括QTL基因型值和多基因育種值進(jìn)展)最高,QTL增效等位基因頻率上升速度最快,其次為策略Ⅱ,策略Ⅲ的遺傳進(jìn)展最低,QTL增效等位基因頻率上升最慢;不同留種策略下的群體近交系數(shù)總體上呈現(xiàn)策略Ⅰ策略Ⅱ策略Ⅲ的規(guī)律,但策略Ⅱ的群體近交系數(shù)與策略Ⅲ接近且遠(yuǎn)低于策略Ⅰ。在育種實(shí)踐中實(shí)施基因輔助BLUP選擇時(shí),策略Ⅱ既能保證較高的遺傳進(jìn)展,又能有效控制近交,因而不失為一種理想的留種策略。
[Abstract]:In order to reveal the selection effect of gene assisted optimal linear unbiased prediction (BLUP) method under different seed retention strategies, it was assumed that the target quantitative traits were controlled by a double allele QTL and multiple genes simultaneously. The use of marker-assisted BLUP to select 10 generations in a closed population (10 males and 190 females) was simulated. Three seed retention strategies were considered in the selection experiment: strategy I was used only according to individual estimated breeding value (EBV), and strategy 鈪，

本文編號(hào)：2141013