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但受精指数仍然较低，很难获得回交种子。So it was difficult to obtain seeds by backcross.

上述结果通过回交试验得到进一步验证。The results were verified by backcross inheritance experiment.

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对回交育种中的有关技术也进行了讨论。The related techniques in backcross breeding were also discussed.

在回交后代中，抗性水平逐代降低。The resistant level was declined with increasing of backcross generations.

该方法可以很方便地应用于实际的回交育种。The method can be conveniently applied to practical backcross breeding programs.

利用连续回交手段将矮败小麦由冬性转育为春性。Dwarfing-sterile wheat was changed from winterness to springness by continue backcross.

杂交产生的子一代个体再与其亲本进行交配的方式。Backcross A cross between an individual and an individual of the original parent generation.

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回交法对提高亚麻出麻率和纤维产量上效果显著。Backcross makes a notable impact eff ection on improving fibre yield and long fibre content.

对小麦回交后代的蛋白质含量进行了分子标记辅助选择研究。Marker-assisted selection for protein content was conducted in backcross population in wheat.

由此在抗条锈育种上采用回交方法的效果较好。So it was better to take the backcross method than other methods in anti-strip rust breeding.

修饰回交法是将杂种品系间杂交和回交相结合的一种方法，即回交品系间杂交法。Modified backcross is a tentative method for combining the effect of intermating and backcrossing.

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。Alloplasmic male sterile line 034A was breeded by using method of distant hybridization and backcross.

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矮生玉米自交系的选育方法主要有系谱法、回交法和聚合选择法。Pedigree method, backcross method and convergent cross selection are used widely in dwarf maize breeding.

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。Keep the original strains going. After several generations you will need to backcross to one of the previous strains.

统计分析表明，平均导入片段数和平均导入片段长度均随回交世代的增加而逐渐减少。Both the average number and length of introgressed segments decreased along with the increase of backcross generations.

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。Male sterile line mainly came from the natural mutant, and then transformed sterile line and maintainer line by backcross.

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。Conditional distribution was derived for the genome composition given the marker genotype of individuals from a backcross population.

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本研究利用三个回交组合，针对油菜种子高油酸、低亚麻酸含量进行分子标记辅助选择。In this study, we used marker-assisted selection for high-oleic, low linolenic acid content rapeseed in three backcross combinations.

由于这个原因，作囤这类物种的遗传连锁图谱通常是使用回交群体。For this reason, in this type of species such as the silkworm, backcross population is generally used to map dmninant-recessive markers.

在F_4，所选得具指示性状的优系，其经济性状受父本影响较大。Excellent line with marking character was selected from F_4, and this line's economic character was greatly influenced by backcross parent.