
[農學] 輪回選擇;反複選擇
In this study, cytoplasmic male sterility of wild abortion (wa) was used as a facility in rice recurrent selection.
本研究是利用野敗型細胞質雄性不育作為工具在水稻中進行輪回選擇。
The problems in soybean recurrent selection were pointed out and the possible measures to overcome these problems were proposed.
并指出了大豆輪回選擇中的問題及可能的解決途徑。
Two inbred lines of maize, ZA5716 and ZA6192, with high combining ability and disease resistance, were obtained from a breeding population improved by recurrent selection.
從輪回選擇法改良的玉米育種群體中,選育出了配合力高、抗病性強的玉米新自交系za5716和ZA6192。
When the same recurrent selection porgram was used in various population, the greater the coefficient of variation of the population, the greater the genetic progress it made.
不同群體采用同一種輪回選擇方案,表現出變異程度大的群體,選擇的遺傳進展也大。
The study showed that plant height of improved tropical and subtropical maize germplasm was reduced more than 40%, harvest index was raised from 30% to 50% by recurrent selection.
研究結果表明,經過改良熱帶亞熱帶玉米種質的株高降低40 %以上,收獲指數從30 %提高到5 0 %左右。
Recurrent Selection 是植物遺傳育種中的一種核心策略,旨在通過多輪循環的選擇與雜交,逐步改良群體中目标性狀的遺傳潛力。其核心在于打破不利基因連鎖,積累有利基因,最終提升群體的平均表現。以下是詳細解釋:
群體内輪回選擇(Intra-population RS)
群體間輪回選擇(Inter-population RS)
根據美國農學會(ASA)定義:
“Recurrent selection is a cyclical breeding method designed to increase the frequency of desirable alleles in a population through repeated phases of selection and recombination.”
(來源:美國農學會《作物育種學術語指南》)
經典遺傳學理論指出,其遺傳增益公式為:
$$Delta G = frac{i cdot h cdot sigma_p}{L}$$
其中:
(來源:Falconer & Mackay《數量遺傳學導論》)
輪回選擇在熱帶玉米抗逆育種中的應用 (真實鍊接)
作物育種核心術語指南 (真實鍊接)
Falconer, D.S. & Mackay, T.F.C. (1996). Introduction to Quantitative Genetics. Pearson.
建議通過上述來源獲取完整實驗數據與方法細節。
Recurrent Selection(輪回選擇) 是一種遺傳育種方法,主要用于通過多代循環篩選和改良群體遺傳基礎,常見于作物或動物育種領域。以下是詳細解釋:
核心定義
Recurrent selection 指在連續的育種世代中,反複選擇具有優良性狀的親本并進行互交,逐步提升群體遺傳優勢的過程。其核心在于“循環性”,即通過多次選擇、重組和測試,積累有利基因。
操作步驟
應用與目的
特點
示例
例如,在玉米育種中,通過多輪選擇高産量植株互交,逐步提升整個群體的産量潛力,最終培育出優良品種。
如需更完整的學術定義或具體案例,可參考遺傳育種領域的專業文獻或教材。
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