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backcross hybrid
相关语句
  回交杂种
     The hybrid and its backcross hybrid (F_1 and 1st~4th tetraploid backcros. hybrid♀×common carp ♂) were conducted from 1986 to 1990. Their chromosomal numbers are about 200±,and the volume of their erythrocyte nuclei is about 1.3 times as big as that of C.
     1986~1990年,杂种子1代和它的回交杂种(F_1和第1~4次的回交杂种雌鱼)与雄鲤进行了回交。 它们的染色体数目约为200±,红细胞核体积约为银鲫的1.3倍。
短句来源
     Differences in Gene Expression at Bud Stage of Backcross Hybrid Between Ogura-type Male-Sterile Brassica napus L. and B. campestris L.versus Parents
     甘蓝型油菜Ogura 雄性不育×白菜的回交杂种后代与亲本之间蕾期基因表达差异比较研究
短句来源
  “backcross hybrid”译为未确定词的双语例句
     The strain I of Hubei Red chicken had been established by systematic selection for four generations based on the group crossed with HE×FH hybrid and backcross hybrid ofRhode Island Red chicken (H : the strain from Holland, E : the strain from England, F:the strain from France).
     利用洛岛红法系(F)、荷系(H)、荚系(E)三个系父本的单杂交、双杂交的优秀组合HE×FH及反交组组建基础群,经过四个世代的系统选育,育成湖北红鸡I系.
短句来源
     Crosses between female parent of Ogura male sterility Brassica napus L. and male parents of B. campestris ssp. chinensis Makino were made and F_1,BC_1 and BC_2 generations produced. Gene expression of two Chinese cabbage backcross hybrid BC_1, BC_2 and their parents at bud stage was analyzed by means of cDNA-AFLP technique.
     以甘蓝型油菜(Brassica napus L. AACC, 2n= 38)Ogura 细胞质雄性不育材料为母本,以不同白菜(B .campestris ssp. chinensis Makino, AA, 2n=20)‘新选1号’和‘矮脚黄’的自交系为父本进行杂交,获得了杂种F1、BC1、BC2 代。
短句来源
  相似匹配句对
     Abortion of postfertilization hybrid embryo in interspecific backcross was discussed.
     对回交种子胚败育现象进行了探讨。
短句来源
     Hybrid Mail
     混合邮件
短句来源
     Hybrid Buses
     混合动力公共汽车
短句来源
     Studies on Genetic Characteristics of a Trispecific Hybrid Backcross Progenies
     三元杂种回交后代性状遗传学研究
短句来源
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  backcross hybrid
Chief and a third backcross hybrid of Rubus occidentalis, and in backcrosses to raspberry of R.
      
Similar analyses into the backcross hybrid mesocarp oils on the whole confirmed co-dominance when the backcross ratio of 1:1 was obtained.
      
oleifera), F2 and the backcross hybrid mesocarp oils demonstrated that most fatty acid and triglyceride compositions of oils from hybrid palms are intermediate between those of their respective parentals.
      
Second, backcross hybrid leaves decomposed more slowly than those of either parent.
      
napus introgression into multiple backcross hybrid generations with B.
      
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Body colour and somatotype inheritance in Cyprinus carpio were studied withemphasis on somatotype.The body colour of the hybirds (F_1) of Cyprinus carpio var. Wuyuanesis with golden colour and stout body ×C. carpio yuankiang with grey colour and elongatebody. Despite of orthogonal or reciprocal the offspring was grey in colour so thatthe golden colour of the carp seems to be recessive to grey colour.The body colour of the second generation (F_2) from the F_1 internal recipocalcross differantiation appeared....

Body colour and somatotype inheritance in Cyprinus carpio were studied withemphasis on somatotype.The body colour of the hybirds (F_1) of Cyprinus carpio var. Wuyuanesis with golden colour and stout body ×C. carpio yuankiang with grey colour and elongatebody. Despite of orthogonal or reciprocal the offspring was grey in colour so thatthe golden colour of the carp seems to be recessive to grey colour.The body colour of the second generation (F_2) from the F_1 internal recipocalcross differantiation appeared. The ratio of grey to golden colours 15: 1. In backcrosshybrids of F_1 and recessive parents, the ratio was 3: 1. So, we consider that body co-lour is controlled by two pair of genetic factors and it is non-sex-linkage inheritance.Somatotype of F_1 hybrids was between two parents and was slightly similar tomother, the orthogonal was different from reciprocal cross. Body form in F_2 genera-tions present extensive varieties (long-type, short--type and intermediate-type, etc.),therefore, it is considered that heredity of somatotype was a complex multigenic effect.Body form of the backcross hybrids inclines to their backcross's parents. Thebackcross hybrirds of F_1 and C. carpio var. Wuyuanensis were different very muchfrom the backcross hybrids of F_1 and C. carpio yuankiang.Body form and body weight has close relation, and it could be calculated. In F_2offspring of full-sib, coeffcient of correlation between body length (x) and bodyweight (z) was r_(xz)=0.69, and that of body height (y) and body weight was r_(yz)=0.74.In F_2 generation groups of different somatotype different growth speed reveal and thecoefficient of correlation was also different. The offspring with longer body grew fas-test and the body reaches to the biggest. The coefficient of correlation between bodylength and body weight was r_(xz)=0.90 and that of body hight and body weight wasr_(yz)=0.93.This article deals mainly with the selection of body form.

用桔红色、体型粗短的荷包红鲤与青灰色、体型长的元江鲤杂交,正反交的 F_1皆呈青灰色,青灰色为显性,桔红色为隐性。F_1自交,体色分离,青灰色与桔红色之比为15:1。F_1与隐性亲本荷包红鲤回交,青灰色与桔红色之比为3:1,故认为鲤鱼体色性状由两对遗传因子控制。 F_1的体型介于双亲之间,但偏母本,故正反交F_1有差异。F_1自交,F_2体型分离,各种体型呈数量性状分布。体型无明显的显隐性关系,属多基因效应。 F_1的体型较似F_1的选择亲本,且齐性有提高。 F_1与亲本回交,子代偏向回交亲本:xF_1荷包红鲤回交,回交鲤较似荷包红鲤;F_1与元江鲤回交,回交鲤较似元江鲤。 鲤鱼的体型与体重有密切关系。体长、体高与体重呈显著正相关性。分析 F_2群体不同体型的鱼的体长、体高与体重的相关系数及其生长情况,结果表明以偏长型个体的生长、增重最快。 F_1 杂种优势显著,回交鲤较F_1又有显著提高,F_3选择效果良好。

The capacity to regenerate sufficient numbers of somaclones to produce adequate population sizes from which to select is an important component of utilizing somaclonal variation for cultivar improvement. This study was conducted to determine the genetics of regeneration ability in immature panicle culture. Rice immature panicles derived from 10 cultivars, 12 F_1 hybrids from a 4×4 diallel, their F_2 and F_3 progenies, and 24 backcross hybrids were cultured in vitro. Significant genotypic differences...

The capacity to regenerate sufficient numbers of somaclones to produce adequate population sizes from which to select is an important component of utilizing somaclonal variation for cultivar improvement. This study was conducted to determine the genetics of regeneration ability in immature panicle culture. Rice immature panicles derived from 10 cultivars, 12 F_1 hybrids from a 4×4 diallel, their F_2 and F_3 progenies, and 24 backcross hybrids were cultured in vitro. Significant genotypic differences in regeneration ability were found among the 10 cultivars. The US cultivar Lemont possessed a higher regeneration ability, averaging 8.58 plants per panicle. In contrast,the indica cultivar IR36 had a low regeneration ability, averaging 0.14 plant per panicle. Generation mean analysis of regeneration ability revealed significant values for the estimates of dominance gene effects (d), and for additive × additive (aa) and dominance × dominance (dd) epistatic effects, but showed additive effects to be of minor importance. The heritability estimate calculated by parent-offspring regression was 0.25. Since additive effects are of minor importance and the heritability estimate is low, improving regeneration abilities through hybridization does not appear practical. Conducting an initial screening within possible genotypes to identify those with inherently high regenerative abilities, such as Lemont or IRGA 409, appears to be a better alternative.

提高植株再生率是体细胞遗传研究的重要课题。本项研究以桂朝,IR36,南京11号,IRGA 409,Tetep,Costa Rica 1119,Cica 6,Cica 8,Lemont及Short Tetep等10个水稻品种为材料,按完全区组设计种植上述品种,并采集适龄幼穗离体培养,比较了植株再生率的品种间差异。结果表明:品种(即遗传型)的平均再生率呈显著差异。作者从上述10个品种中选取了易培养及难培养的四个亲本,配制4×4完全双列杂交,取其F_1,F_2,F_3和回交世代(P_1F_1及P_2F_1)进行幼穗培养。并以世代平均数法(Gamble,1962)进行性状的遗传分析,数据以SAS软件处理、IBM-AT微机统计分析。结果表明:显性基因效应(d)及上位效应(aa,dd)是构成世代平均数变异的主要因素。按亲子回归法计算的遗传力估计值为0.25。作者认为,在进行体细胞无性系变异研究时,应选用易培养的亲本为外植体的供试材料。

This paper reports the preliminary study on tetraploid hybrid of natural gynogenetic Fangzheng Silver cru cian carp. In 1984 , the fertilized eggs of C. auratus gibelio ♀×Cyprinus carpio ♂ were cold shocked in water of 0—1.5℃ for 20 minutes, 2 minutes after fertilization, and we obtained tetraploid hybrid. The hybrid and its backcross hybrid (F_1 and 1st~4th tetraploid backcros. hybrid♀×common carp ♂) were conducted from 1986 to 1990. Their chromosomal numbers are about 200±,and the volume of their...

This paper reports the preliminary study on tetraploid hybrid of natural gynogenetic Fangzheng Silver cru cian carp. In 1984 , the fertilized eggs of C. auratus gibelio ♀×Cyprinus carpio ♂ were cold shocked in water of 0—1.5℃ for 20 minutes, 2 minutes after fertilization, and we obtained tetraploid hybrid. The hybrid and its backcross hybrid (F_1 and 1st~4th tetraploid backcros. hybrid♀×common carp ♂) were conducted from 1986 to 1990. Their chromosomal numbers are about 200±,and the volume of their erythrocyte nuclei is about 1.3 times as big as that of C. auradus gibelio' s · Besides, the body weight of tetraploid backeross offsprings is 1.47 times as heavy as that of triploid silver erucian carp which were fed in one pond in 1987. The tetraploid hybrids basically keeps the features and habits of C. auradus,gibelio,and the features are quite stable, meanwhile, they can repreduce as well. So it is possible for them to be aquacultured as a reasonable crueian carp new strain.

本文报道了天然雌核发育方正银鲫四倍体杂种的初步研究。1984年,银鲫♀×鲤鱼♂授精2分钟后的受精卵在0~1.5℃的水中冷处理20分钟,获得四倍体杂种。1986~1990年,杂种子1代和它的回交杂种(F_1和第1~4次的回交杂种雌鱼)与雄鲤进行了回交。它们的染色体数目约为200±,红细胞核体积约为银鲫的1.3倍。1987年同池饲养的四倍体回交子代的体重是三倍体银鲫的1.47倍。四倍体杂种基本上保持了银鲫的性状与习性,而且相当稳定,同时它们也能够繁殖。因此,它们可作为水产养殖的鲫鱼新品种。

 
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