Various approaches have been used to improve the performance of adapted indigenous stock, including cross-breeding and upgrading through back-crossing with improved breeds, and within-line selection.
已有多种方法被用于提高地方良种的性能，包括杂交育种，以及通过与良种的回交和品系内选育进行的品种改良。
The ratio of polyploid produced was 87. 5 %, which has shown that crossing combination between Dayali and Pingguoli has special value in pear polyploid breeding.
多倍体出现率为87．5％，表明大鸭梨与苹果梨杂交组合在多倍体育种中具有特殊价值。
The concept and classification of crop resistance to diseases and pests and the breeding ways including crossing breeding and modern biotechnology application were introduced.
综述了农作物抗病虫性的概念和分类，以及抗病虫育种的途径，包括常规育种和应用生物技术育种的方法。
Through combining ability and genetic effect analyses of 20 crossing from a set of 5 >< 5diallel crosses to establish the base theory of quality breeding for Chinese cabbage.
最后对5份亲本，20个杂交组合进行配合力和遗传效应分析，为大白菜的品质育种提供理论依据。
With application of modern genetic theory and breeding technique, the paternal and maternal lines used for crossing have been established.
运用现代遗传育种理论和方法，育成配套品系的父、母系。
The program of the new cotton breeding method of mass selection-mass crossing is described and the results of breeding cotton is presented in this paper.
本文详细叙述了棉花混选—混交新育种方法的程序及其育种效果。
Breeder must be a specialist in discovering and utilizing key genes and creating new genotypes. Selecting and crossing parents and selecting good offspring are the key art in the breeding program.
育种学家必须是一个多面手，要善于发现和利用关键的基因及创造新的基因型，亲本选配和后代选育是关键艺术。
Responses of main characters of upland cotton to mass selection-mass crossing breeding system were studied.
研究了陆地棉主要性状对混选—混交育种体系的响应。
Especially, what self-crossing is highly no appetency makes easy lose of good single genotype, which propagatation and conservation of good varieties breeding brings great difficulty.
特别是自交高度不亲和性，往往使得优良单株基因型很容易丢失，给优良品种选育材料的繁殖和保存带来了极大困难。
Teyou 9322 is a new hybrid medium nonglutinous combination from crossing male parent Yanhui 9322 and female parent Longtefu A by Yancheng Breeding Institute of Rice and Wheat of Jiangsu.
特优93 2 2是江苏省盐城市稻麦育种研究所用龙特甫A为母本，盐恢93 2 2为父本配组选育而成的优质杂交中籼新组合。
Teyou 9322 is a new hybrid medium nonglutinous combination from crossing male parent Yanhui 9322 and female parent Longtefu A by Yancheng Breeding Institute of Rice and Wheat of Jiangsu.
特优93 2 2是江苏省盐城市稻麦育种研究所用龙特甫A为母本，盐恢93 2 2为父本配组选育而成的优质杂交中籼新组合。
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