查询词典 backcross

Juncen. The seed setting by backcross were even lower, only 0.35 and 0.33 per silique respectively, when using F1 with glufosinate-resistant gene and glyphosate-resistant gene as maternal plants and wild B. juncea as parental plant.

分别以两种F1为母本，野芥菜为父本进行回交，结实仍然很低，携带抗草丁膦基因的F1和携带抗草甘膦基因的F1与野芥菜回交每个角果饱满种子粒数分别只有0.35和0.33。

We also detected genomic changes which were possibly associated with the reduced fitness in backcross by amplified fragment length polymorphism. The changes mainly involved loss of parental AFLP bands (backcross1, F1 hybrid female×olive flounder male, 3.96%; backcross2, F1 hybrid female×summer flounder male, 6.03%) and gaining of novel bands (backcross1, 5.63%; backcross2, 3.28%).

同时，利用AFLP对回交子代基因组的变化进行了分析，发现回交中不仅存在亲本位点的丢失(褐牙鲆回交子代-回交1， 3.96%；夏牙鲆回交子代-回交2， 6.03%)的现象，也存在非亲位点(回交1， 5.63%；回交2， 3.28%)的现象。

Based on the Liriodendron interspecies hybridization study by professor Ye Peizhong,according to the satisfying and exact mating system and field design,the reciprocal cross with extensive genetic background of Liriodendron tulipifera Linn., the backcross and F 1 crossing which had never been made, and the genetic analysis of heterosis of the hybrid tulip tree were carried out.

在叶培忠先生的鹅掌楸属种间杂交育种研究基础上按遗传设计与环境设计开展了扩大北美鹅掌楸遗传基础条件下的正反交以及前人从未做过的回交和F1 间杂交，并进行了杂种马褂木杂种优势的遗传分析。

The fertility of F_1 and backcross progenies from crosses between the alloplasmic wheatvarieties Chris with 10 different Aegilops cytoplasms and 77(2),a 1B/1R wheat-ryetranslocation line,was investigated.

调查了10种不同山羊草细胞质的异质小麦品种 Chris 与1B /1R 小黑麦易位系77(2)杂交 F_1及回交后代的育性表现，结果表明：1。

Thinopyrum intermedium,one of the relative species of common wheat,is a kind of dominant wheat germplasm resource for the resistance to stripe rust in wheat genetic improvement. With using Chinese spring phlb as recurrent parents and awnless Zhong 4(a partial chromosome of Thinopyrum intermedium)as donor parents,that is backcross selection,the offspring BC_2F_(7～9)were acquired.Cytology check and genome in situ hybridization, were used for the translocation lines and substitution lines detection.

本研究采用常规杂交并辅抗性鉴定等方法，以中国春phlb突变体为轮回亲本，利用无芒中4，转育中间偃麦草的抗条锈性，并通过细胞学和DNA原位杂交检测，鉴定和筛选普通小麦—中间偃麦草的抗条锈病异代换系或易位系。

Two parents,Balillaand Nantehao,which were significantly different on GT-ASV,were selected to construct a backcross population Balilla/Nantehao//Balilla containing 142 individuals.

选择在ASV-GT上具有显著差别的籼稻品种南特号和粳稻品种Balilla杂交，并以Balilla回交得到含有142株的回交群体。

The QTL controlling spikelet fertility and pollen fertility were investigated based on the Balilla/NTH//Balilla backcross population by SSR marker. For spikelet fertility trait, two QTLs, qSPTF1 on chromosome 1 and qSPTF6 on chromosome 6, were detected, and their additive effect were 13. 501 and -16. 414, respectively. According to previous studies, qSPTF6 was deduced to be same as S〓.

以回交群体 Balilla/南特号//Balilla 为育性基因的分析群体，研究了该群体中控制小穗育性和花粉育性的基因位点，对于小穗育性共检测到2个QTLs，qSPTFl和qSPTF6，分别位于第1和第6染色体上，其加性效应分别为13.501和-16.414。

The phenotypic mean values for the three populations and the midparental heterosis values for the two backcross populations were used for quantitative trait locus mapping and analysis, the genetic basis and correlations betweent the traits were analysed.

将三个群体的表型值和两个回交群体的中亲优势值进行了数量性状位点(quantitative trait locus，QTL)的检测及效应分析，初步分析了持绿性、充实度和产量等农艺性状的遗传基础和各性状间的相关关系。

Li has also introduced chromosome engineering to the breeding of wheat strains with a "nullisomic backcross method", which has reduced the duration of wheat breeding through distant hybridization to 3.5 years, whereas the previous breeding of "Xiaoyan" lasted 20 years.

李振声还采用了缺对染色体回交的方法将染色体工程引入到了小麦强度的培育方面。通过这种方法可以将远缘杂交的时间减少到三年半。采用之前的方法，笑颜6号的杂交过程需要20年的时间。

By PCR analysis and spreads the leaf examination with PPT in T0 regeneration, 4 transgenic plants were identified with a transferent frequency of 0.33%. In addition, we transfer the wheat Bar gene into wheat cultivated varieties with backcross way.

通过PCR检测和涂叶检测，初步证明其中有4株已将Bar基因整合到小麦基因组中并且得到表达，平均转化率为0.33%。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。