
[农学] 轮回选择;反复选择
In this study, cytoplasmic male sterility of wild abortion (wa) was used as a facility in rice recurrent selection.
本研究是利用野败型细胞质雄性不育作为工具在水稻中进行轮回选择。
The problems in soybean recurrent selection were pointed out and the possible measures to overcome these problems were proposed.
并指出了大豆轮回选择中的问题及可能的解决途径。
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.
从轮回选择法改良的玉米育种群体中,选育出了配合力高、抗病性强的玉米新自交系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.
不同群体采用同一种轮回选择方案,表现出变异程度大的群体,选择的遗传进展也大。
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.
研究结果表明,经过改良热带亚热带玉米种质的株高降低40 %以上,收获指数从30 %提高到5 0 %左右。
Recurrent Selection 是植物遗传育种中的一种核心策略,旨在通过多轮循环的选择与杂交,逐步改良群体中目标性状的遗传潜力。其核心在于打破不利基因连锁,积累有利基因,最终提升群体的平均表现。以下是详细解释:
群体内轮回选择(Intra-population RS)
群体间轮回选择(Inter-population RS)
根据美国农学会(ASA)定义:
“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.”
(来源:美国农学会《作物育种学术语指南》)
经典遗传学理论指出,其遗传增益公式为:
$$Delta G = frac{i cdot h cdot sigma_p}{L}$$
其中:
(来源:Falconer & Mackay《数量遗传学导论》)
轮回选择在热带玉米抗逆育种中的应用 (真实链接)
作物育种核心术语指南 (真实链接)
Falconer, D.S. & Mackay, T.F.C. (1996). Introduction to Quantitative Genetics. Pearson.
建议通过上述来源获取完整实验数据与方法细节。
Recurrent Selection(轮回选择) 是一种遗传育种方法,主要用于通过多代循环筛选和改良群体遗传基础,常见于作物或动物育种领域。以下是详细解释:
核心定义
Recurrent selection 指在连续的育种世代中,反复选择具有优良性状的亲本并进行互交,逐步提升群体遗传优势的过程。其核心在于“循环性”,即通过多次选择、重组和测试,积累有利基因。
操作步骤
应用与目的
特点
示例
例如,在玉米育种中,通过多轮选择高产量植株互交,逐步提升整个群体的产量潜力,最终培育出优良品种。
如需更完整的学术定义或具体案例,可参考遗传育种领域的专业文献或教材。
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