pure line breeding

What are reported in this paper are as follow, the process, methods of purificating the rice sterility lines; in pure lines Ⅱ—32—5A and Ⅱ—32—8A, their purity, the rate of steritity plants, the degree of steritity, the characteristic of reproduction, etc.

介绍了水稻不育系Ⅱ—32A的提纯经过、方法以及纯系Ⅱ—32—5A、Ⅱ—32—8A的品系纯度不育株率、不育度和生育特性等性状表现。

Purity,genetic stability and combining ability of pure lines were discussed.

讨论了纯系的纯合性、遗传稳定性以及配合力等方面的特征。

At present,the breeding should be established in the selecting breeding and obtain pure line to keep the stable inheritance of economic traits.

随着栽培经验的积累和科学技术的发展,紫菜的遗传育种已从最初的选择性育种发展到利用基因工程技术进行遗传性状的改造,并建立纯系使经济性状能够稳定遗传。

, four pure lines of ramie were obtained from 28 selfs (GS 2) which originated from the parthenogenetic seeds (GS 1) of 13 ramie cultivars such as Xiangzhu 1,2,3,4 and 5, Zhengning Ramie and Germplasm 11 etc.

以湘苎１～５号和镇宁苎麻等１３个品种为材料，以不同种类、浓度和配方的药剂诱导产生５５份孤雌生殖结实种子（ＧＳ１），将部分ＧＳ１植株隔离自交种子育苗，实得２８个自交系，根据叶形、叶缘锯齿、叶柄色和雌花色等１０个形态性状的一致性，从中选择４个纯系，还从ＧＳ１和ＧＳ２群体中获得若干雄性不育材料，为苎麻遗传育种研究提供了物质基础。

Using deterministic methods,rates of genetic gain(△G) and inbreeding(△F) were compared between pure line selection(PLS) and combined crossbred purebred selection(CCPS),for the sire line of a three-way crossbreeding scheme.

本文比较了纯系选择与组合选择两种方法在肉鸡三系配套杂交方案中父本品系遗传进展与近交速率的变化情况,模拟试验结果表明,在遗传参数和总的测定笼位一定的情况下,包含纯种与杂种信息的组合选择获得的累积遗传进展(△G)总是高于纯系选择,近交速率(△F)也高于纯系选择方法。

Using deterministic methods, rates of genetic gain(△G)and inbreeding(△F )of 18 breeding scheme were compared between pure line selection(PLS)and combined crossbred purebred selection(CCPS) by Monte Carlo, for the sire line of a three-way crossbreeding system, with the same genetic parameters and population size.

本试验以肉鸡三元配套系中的父本品系为研究对象,在遗传参数和总的测定笼位一定的情况下,采用Monte Carlo方法比较了纯系选择(PLS)与组合选择(CCPS)两种方法各9种方案下肉鸡体重杂种性能遗传进展与近交速率的变化情况,同时比较了组合选择相对于纯系选择的优势。

Experiment on eyed eggs incubation of pure line Oncorhynchus mykiss under low temperature;

纯系金鳟发眼卵低温孵化试验