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multiple crosses
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  “multiple crosses”译为未确定词的双语例句
     HR195, derived from multiple crosses of one early variety (Erjiuqin) and three late restorers (Taiyin 1, N Dao and Minghui 63), was developed by way of directional transferring of early gene maturity into late restorer. Its characteristics are: ①It is late in maturity, but its hybrids show earlier maturity, which occurs very scarcely in the existing late restorer lines.
     新恢复系HR195是用早熟早籼品种与多个迟熟恢复系杂交,经定向培育而成的含有早熟基因的迟熟恢复系,具有下列特点:(1)自身表现迟熟,但所配系列组合表现早熟,这在其他迟熟恢复系中是少见的;
短句来源
     Development and use of "double -low" variety is becoming a main aim of breeding and produetion . "Guiyou No 7" has been developed through multiple crosses and pedigree selection . its normal yield was between 130~ 150 kg/666. 7 m2,with erucie acid content of 0. 15 % ~0. 3%, glueosinolates content of 12~22μml, and total oil content of 38% ~39 %.
     贵油7号采用品种间复合杂交、回交和系谱法选择相结合育成,在一般大田生产条件下,130~150kg/666.7m2原种芥酸含量0.15%~0.30%,硫甙含量12~22μml,含油量38%~39%。
短句来源
     Nan 34, bred from multiple crosses of indica-japonica, is a good quality and excellent disease-resistant Dian type restorer line.
     南34是应用籼粳杂交经系统选育成的抗病优质滇型粳稻恢复系。
短句来源
     In this study, new type of indica-introgressed tropical japonica lines by multiple crosses with marker-assisted selection (MAS) was developed.
     本研究通过复合杂交结合分子标记辅助选择 (MAS)培育出新型的籼稻基因渗入热带粳稻品系。
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  相似匹配句对
     Multiple neurolemmoma
     多发性神经鞘瘤
短句来源
     Multiple schwannomas
     多发神经鞘瘤
短句来源
     (5) The crosses between I.
     5)在不亲和种间杂交组合I.
短句来源
     Based on the genetic information provided by joint analysis of multiple generations, breeding strategies for different crosses and traits were discussed.
     根据试验结果,分析了不同性状、不同组合的育种策略。
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  multiple crosses
This method also reveals maternal inheritance of plastids in crosses between isolates of Bostrychia radicans and in multiple crosses between isolates of B.
      
Most approaches in genomics, however, develop their full power only when they are based on analyses of large numbers of genotypes from multiple crosses and current as well as past generations.
      
Only for the QTL on distal Chr 1 was there convincing evidence that the same or at least a very similar QTL was detected in multiple crosses.
      
The goal was to test the hypothesis that given the relatively simple structure of the laboratory mouse genome, the same QTLs will be detected in multiple crosses which in turn will provide support for the strategy of multiple-cross mapping (MCM).
      
Primer pairs for 351 loci were developed from ESTs present on public databases and screened for polymorphism in the "Merzling" (a complex genotype Freiburg 993-60 derived from multiple crosses also involving wild Vitis species) ×?Vitis vinifera (cv.
      
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Based on thirty years experiences in the development and exten-sion of rust-resistant wheat cultivars,several important problemsconcerning this work were discussed.1.Analysis of parentage of the released wheat cultivars showedthat the dosage of good parents with high yielding capacity and adap-tability in crosses,especially in multiple crosses,shouldn't be lessthan 1/2.In choosing or using rust-resistant parents,varietal proper-ties pertaining to the tolerance to adverse environmental conditions would...

Based on thirty years experiences in the development and exten-sion of rust-resistant wheat cultivars,several important problemsconcerning this work were discussed.1.Analysis of parentage of the released wheat cultivars showedthat the dosage of good parents with high yielding capacity and adap-tability in crosses,especially in multiple crosses,shouldn't be lessthan 1/2.In choosing or using rust-resistant parents,varietal proper-ties pertaining to the tolerance to adverse environmental conditions would also be of importance.2.The prerequisite for success in breeding wheat for rust-resis-tance is the choice of parents and making the best possible combina-tions.The size of the segregating population should be as large aspossible within the limit of facilities.It was considered feasible todiscard crosses on the basis of F_2 yield trials as well as to discardlines on the basis of 2 successive early generation progeny tests.Thekernel weight form single spike could be considered as a criterion forhigh yielding ability,with an adequate number of spikes per unitarea as a prerequisite,in the development of high-yielding cultivarsunder conditions of high fertility and good irrigation.The importanceof field inoculaton and green house seedling tests with several pre-vailing physiological races of the rust pathogens in segregating genera-tions was also stressed.3.The experiences from the extension of three cultivars pointed out that whether a new cultivar could meet the requirement of the cul-tural practices when it would be released was an important factor of its acceptance by the farmers.Consequently,special care should bepaid to the level of fertility and management of the experiment plots.Another point was that the new cultivars should be released in bat-ches so that the farmers could make their own choice among them.4.The evaluation of recent introductions of breeding materials,thecreation of our own breeding stocks,the utilization of intermediateproducts,genetic studies of rust resistance and the use of horizontalresistance were also discussed.

本文是根据品种育成推广的经历及现状,提出了抗锈育种工作中几个应注意的问题。进一步强调了在亲本选配问题中高产亲本的作用,并论述了抗锈亲本的选择与利用经验。文中提出杂种群体大小应在人力可以掌握的范围内适当扩大,并扼要论述了杂种组合产比与早代产比的部分结果,强调了多小种接种的重要性。通过三个品种的推广讨论了试验地生产水平问题。文中还对人工创造原始材料、品系间杂交、抗锈遗传研究及水平抗性利用等问题提出了一些看法。

Parent selection based on genetic distance of quantitative characteristics of parents and breeding objectives was approached in this paper. A new method named Cross Performence Index--CPI was proposed.CPI=D~2/SSD, where D~2 is genetic distance between parents and SSD the weighed sum of square deviation as in the least-square method proposed by Pederson (1981) The crosses whose CPI is greater are better than those whose CPI is smaller A method for calculating the genetic distance among the materials used as parents...

Parent selection based on genetic distance of quantitative characteristics of parents and breeding objectives was approached in this paper. A new method named Cross Performence Index--CPI was proposed.CPI=D~2/SSD, where D~2 is genetic distance between parents and SSD the weighed sum of square deviation as in the least-square method proposed by Pederson (1981) The crosses whose CPI is greater are better than those whose CPI is smaller A method for calculating the genetic distance among the materials used as parents in multiple crosses, for example, three-way cross and double cross, were given.

本文探讨结合遗传差异和育种目标进行小麦育种亲本选配的问题。提出了亲本选配的组合表现指数法:CPI=D~2/SSD、CPI(Cross Performance Index)即组合表现指数,D~2为亲本间遗传距离,SSD为由这些亲本杂交产生的后代性状群体平均值与相应的育种目标值的加权离差平方和。CPI大的组合优于CPI小的组合。作者还提出了一种计算复交组合亲本间遗传距离的方法。

Twelve wheat cultivars were crossed in a factorial triallel design (4×4×4). Data on six traits of all crosses were recorded on F 1-population and the combining ability of parents was analysed according to "Wolf's (1688) method. The result showed that the additive effect were much more important than the non-additive effect, the special combining abilities of three parents were much higher than that of two parents in the factorial triallel crosses. To use the parents with good combining ability is important for...

Twelve wheat cultivars were crossed in a factorial triallel design (4×4×4). Data on six traits of all crosses were recorded on F 1-population and the combining ability of parents was analysed according to "Wolf's (1688) method. The result showed that the additive effect were much more important than the non-additive effect, the special combining abilities of three parents were much higher than that of two parents in the factorial triallel crosses. To use the parents with good combining ability is important for multiple crosses in wheat breeding.

选用十二个性状各异的小麦品种,配成4×4×4共64个组合,采用Wolf(1988)方法研究了复交中几个主要性状的遗传成分及亲本配合力效应,并对复交亲本及组合进行了具体评价.结果表明,复交群体的各主要性状遗传变异中仍以基因的加性效应占主要地位,三亲特殊配合力的变异度显著高于两亲特殊配合力的变异度.在注意亲本农艺性状水平的基础上,选用配合力好的亲本进行复交是创造较大遗传变异的重要途径.

 
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