backcrossing
Backcross with c ommon wheat had completely no seed set.
用普通小麦回交，未获得回交后代。
The resistant level was declined with increasing of backcross generations.
(2)在回交后代中，抗性水平逐代降低。
The F1 plants of wheat/Y127 gave many tillers, but the backcrossing or self-pollinating descendants produced few seeds.
以普通小麦为母本与柱穗山羊草杂交，F1代分蘖率极高，植株性状出现中亲遗传或超亲遗传，杂交种回交或自交结实率非常低。
Heredity research of aubergine leaf character in Brassica napus was carried out by using the methods of crossing, self-crossing and backcrossing.
采用杂交、交、交方法对甘蓝型紫红叶色油菜进行叶色遗传研究。
The results indicated that the dwarf plants of Iris germanica could be obtained through repeated backcrossing to the dwarf parent.
以花色为主要观赏指标的鸢尾矮生植株需通过与矮生亲本的反复回交筛选得到。
Dwarfing-sterile wheat was changed from winterness to springness by continue backcross.
摘要利用连续回交手段将矮败小麦由冬性转育为春性。
Methods The mice were bred in different ways,including crossbreed,backcross and intercross.
方法采用杂交、回交、互交的方法进行培育;
Transfer of Xa 21 gene resistant to bacterial blight for rice through backcross and anther culture.
应用回交和花培转育水稻抗白叶枯病基因Xa-21
The SHR/y rat is a strain having the SHR Y chromosome in a normotensive WKY background by backcrossing 19 generations of males to a WKY female.
本研究中，我们发展实现了一套灵活且微小化的蓝芽无线传输讯号撷取系统于三维走道之大鼠的神经单细胞纪录。
Backcross A cross between an individual and an individual of the original parent generation.
回交：杂交产生的子一代个体再与其亲本进行交配的方式。
The method can be conveniently applied to practical backcross breeding programs.
该方法可以很方便地应用于实际的回交育种。
Alloplasmic male sterile line 034A was breeded by using method of distant hybridization and backcross.
通过萝卜远缘杂交创建不育源,再经过回交转育而选育出异源胞质不育系034A。
Keep the original strains going. After several generations you will need to backcross to one of the previous strains.
必须继续保留原线鱼种，因为经过异种杂交后往往需要原线鱼种做反交。
The utility of the limited backcross method for improvement of quantitative traits was discussed.
对采用不饱和回交方法改良数量性状进行了讨论。
Infiltration of the genes of one species into the gene pool of another through repeated backcrossing of an interspecific hybrid with one of its parents.
基因渗入一物种的基因通过不断地与另一物种基因的亲代种间逆向杂交，而渗透进另一物种基因库的过程。
In the BC 3 F 2 populations of six varieties and CH448, the CRL variances of different backcross populations were different.
在不同供体品种与CH448的BC3F2群体中,不同回交组合内CRE的变异有所不同.
Greater advance in the* improvement of the fiber qualities has been achieved by the traditional breeding methods,which include crossing, backcrossing and intercrossing, etc.
传统的育种方法通过杂交、回交和互交在打破产量与纤维品质性状的负相关方面取得了较大进展，但育种周期长，成本高，选择效率低。
By studying thesegregations pattern of the fertilities of F_1, F_2 and the backcrossing progenies, the inheritanceof the RN type and ZD type CMS lines were identified.
通过对 F1、F2 和回交后代的育性分离情况,推测不育系保持基因和恢复基因的数量及显隐性关系,确定RN 型和 ZD 型大豆细胞质雄性不育系的遗传模式;
Jinke 1A, developed by crossing the selected F3 individuals of Gang 46B/Jin 23B to Jin 23A and followed by successive backcrossing, is an indica WA-type CMS line in rice.
摘要金科1A是以冈46B/金23B的F3代选系与金23A测交并连续回交转育而成的野败型籼型三系不育系。
For the best use of marker information in a marker aided backcrossing program for gene introgression, a stepwise marker genotyping and individual selection were suggested.
这就是:先根据少数标记对所有个体作初步选择,再根据较多标记对少数个体作精细选择。
Abstract： Chlorophyll content was measured in melon, watermelon, cucumber and pumpkin,and F1, F2 and BC1 (backcross) of melon.
摘要：以不同甜瓜、西瓜、黄瓜、番瓜品种和甜瓜杂交F1、F2及回交后代为实验材料，测定叶片叶绿素含量。
Male sterile line mainly came from the natural mutant, and then transformed sterile line and maintainer line by backcross.
其胞质雄性不育源大多来自自然突变，后经回交转育出不育系和保持系。
Inheritance of resistance belong to additive effects and is controled by additive genes.It can transform through backcrossing and selection techniques of screening.
玉米灰斑病的遗传属数量遗传，且主要受累加基因控制，并可以通过回交和轮回筛选转移。
The morphologically anatomical structure of seed coat of backcross progenies resembled that of B. napus, but was different from that of S. alba.
回交后代种皮解剖结构与甘蓝型油菜相似，而与白芥相差较远。
Conditional distribution was derived for the genome composition given the marker genotype of individuals from a backcross population.
摘要 推导了回交群体中供体基因组成分的条件概率分布,并用平均数预测各个体的供体染色体片段的大小。
There were pigments in seed coats of B. napus and some backcross progenies, but no pigments in those of S. alba and other backcross progenies.
栅栏层在甘蓝型油菜中最厚，在白芥中最薄，而后代介于两者之间。
Gene expression of two Chinese cabbage backcross hybrid BC1, BC2 and their parents at bud stage was analyzed by means of cDNA-AFLP technique.
利用cDNA-AFLP技术对两种材料的不同回交世代BC1、BC2代与其亲本在蕾期的基因表达进行分析。
In this paper we have used the double heterozygote as female parent and the good line as male parent in cross and backcross.
然而，以双杂合体为母本，优良自交系为父本，二者杂交或进行回交，再在杂种后代中选准双杂合体做母本，继续进行自交或回交，是较快而有效的方法。
The variance componentof cross and backcross generations of quantitative character controlled by multigenes is studied on condition of chromosome translocation.
研究了染色体易位情况下,多基因控制的数量性状杂交及回交世代的方差组成。
Xu 29A,developed from the cross and backcross of V20A//(Digu B/Jin 23B) F3 by the Hunan Hybrid Rice Research Center,is a new early-season indica CMS line in rice.
旭29A是湖南杂交水稻研究中心用地谷B作母本与金23B杂交,F3代选优良株系与V20A测交并经多代回交转育而成的早籼稻不育系,2000年3月通过湖南省农作物品种审定委员会审定。
The ratios of the sterile plants with the fertile plants in their F1, F2 generations, and their reciprocal backcross generations with the male sterile plants were calculated.
同时，以具有正常细胞质的自交系为母本，育性完全恢复的测交F1植株为父本进行反交，对其反交的F1及F2进行育性观察分析。
Backcross breeding is a useful method to transfer favorable alleles from a donor parent into a recipient parent.Marker-assisted selection (MAS) can speed up the process.
摘要 回交育种是把有利基因从供体亲本向受体亲本转移的一种有效方法，标记辅助选择可加速其进程。
Molecular marker-assisted selection (MAS) provides a very efficient tool for backcross breeding because it can offer rapid and precise selection of the targeted gene.
分子标记辅助选择技术以其对目标基因快速而精确的选择为回交育种提供了非常有效的工具。
Statistical genetic analyses were conducted on the data of 4 populations with 2010 litters including Erhualian pig (P1), Large White(P2), first cross(F1) and backcross(B2).
对二花脸猪、大白猪、杂交一代和回交一代四个群体共计2010窝产仔数的资料进行了统计遗传分析。
At the same time the applications of the method in the different segregating generations such as the F2、 backcross、 RIL、 DH and so on were introduced and compared.
同时概述了集群分离分析法在F2代、回交、双单倍体、重组自交系等不同分离群体中的应用情况，并对不同分离群体的优缺点进行了比较。
No significant differences in studied traits was obssrved among the groups with various genes,controlling erucic acid content(EAC)in the backcross generation.
回交世代不同芥酸含量的各组在产量和大多数其他性状上没有明显差异。
CMS line 803A was developed by the recent discovery of JW new nature source sterile through many continuous generation of backcross with the L301B/Di Gu B hybrid descendant.
摘要不育系803A是利用新发现的JW型新质源不育株做母本，L301B/地谷B的杂交后代做父本，经连续多代回交选择而成。
A method to estimate the minimal sample size required for marker assisted backcross breeding when both foreground selection and background selection are conducted is proposed.
回交育种是把有利基因从供体亲本向受体亲本转移的一种有效方法,标记辅助选择可加速其进程。
Fifteen patterns of gene expression were observed in F1、BC1、BC2 and backcross parents.The percent of bands expressed in F1、BC1、BC2 and backcross was highest.
两种白菜在F1、BC1、BC2 3个世代与回交亲本花蕾间的基因差异表达有15种类型，其中以在轮回亲本、F1、BC1、BC2中共同出现表达的带的比例最高。
See backcross.
参见backcross.
Meanwhile,backcrossing females 3n AASCC (F 1- similar to ASCC) to faternal parent 3n=156 ASCC could produce first backcross generation (B 1 ASCC being very similar to faternal parent ASCC).
它与父本异育银鲫回交可以产生回交子一代 (B1)。 雄核发育异育银鲫、回交子一代异育银鲫与父本异育银鲫非常相似。
He 50A is a new WA-type early cropping indica CMS line in rice,which is developed by crossing Jin 23A to a selected F4 plant of Zhong 9B//161-5B/Jin 23B through successive selection and backcrossing.
贺50A是以金23A为母本,中9B//161-5B/金23B的F4代单株为父本,经多代择优回交与选择育成的早籼型三系不育系。
Meanwhile,backcrossing females 3n AASCC (F1- similar to ASCC) to faternal parent 3n=156 ASCC could produce first backcross generation (B1 ASCC being very similar to faternal parent ASCC).
它与父本异育银鲫回交可以产生回交子一代(B1)。雄核发育异育银鲫、回交子一代异育银鲫与父本异育银鲫非常相似。
Jiufeng A is a new WA-type early cropping indica CMS line in rice, which is developed by crossing Jin 23A to a selected F4 plant of 688 B/Fuyi B through successive selection arid backcrossing.
摘要以金23A为母本，688B/福伊B的F4代单株为父本测交，经多代择优回交，育成早熟籼型三系不育系九丰A。
He 50A is a new WA-type early cropping indica CMS line in rice, which is developed by crossing Jin 23A to a selected F4 plant of Zhong 9B//161-5B/Jin 23B through successive selection and backcrossing.
摘要贺50A是以金23A为母本，中9B//161-5B/金23B的F4代单株为父本，经多代择优回交与选择育成的早籼型三系不育系。
Eight Wx genotypes were developed from the improved BC_5F_2 backcross progenies, which follows Mendelian segregation. Among them, there were two aabbdd waxy plants whose amylose content in the BC_5F_3 seeds were 1.81% and 0.82%, respectively.
利用上述3个分子标记从BC_5F_2代回交改良群体中筛选出了8种Wx基因型，经卡方检验，其分离比符合3对基因的分离比例，其中基因型为aabbdd的植株有2株，直链淀粉含量分别为1.81%和0.82%，为全糯小麦；
The double low vari ety used backcross male parent for double high GMS, the double low GMS had been bred through continuous backcross, at the same time, the double low hybrid has be en bred.
以现有的双低品种为回交父本，将双高核不育材料转育成双低核不育系，并已配制出了双低杂交种。
Using reciprocal cross,self-cross,and backcross,we have constructed various groups to seek the genetic law and mechanisms of tomato locule formation,for modifying the tomato breeding theory.
结果表明:少心室为不完全显性,回交效应显著,正反交差异不显著,呈现核遗传,细胞质作用不显著。
A method to estimate the minimal sample size required for marker-assisted backcross breeding when both forground selection and background selection and background selection are conducted is proposed.
该文提出了一种估算在标记辅助回交育种中同时进行前景选择和背景选择所需群体大小的方法。
The ratio of resistant and susceptible plants was 1:1 in progenies of backcross of the F1 and susceptible parents, and this ratio was 2.8:1 in the F2 generation from the F1 selfing.
抗性稳定株系与感病亲本杂交，F1表现高抗病，再与感病亲本回交，后代抗感病株比例为1:1，自交F2的比例为2.8:1。