backcrossing

【 Objective 】 Single segment substitution lines ( SSSLs) each with only single chromosome segment from a donor under the same genetic background as the recipient were developed in rice by advanced backcrossing and molecular marker-assisted selection.

目的单片段代换系（SSSL）是通过高代回交和分子标记辅助选择构建的，只含有来自供体亲本的一个染色体片段，遗传背景与受体亲本相同的品系。

Using WCR lines with CMS cytoplasm as female parent to develop new restorer lines by backcrossing.

以同质广亲和恢复系为母本转育新的恢复系。

10. Field evaluation for agronomic traits and disease-resistance of 8 advanced generation progenies ( or breeding lines) derived from continuously backcrossing the somatic hybrids with tobacco cultivars showed that these breeding lines had typical morphology identical to N.

对8个烟草体细胞杂交高世代材料进行田间农艺性状观察、统计分析和黑胫病抗性鉴定，以探讨他们在育种上的利用价值。

The detection of susceptible and resistant strain and their backcrossing heterozygosis with PCR in laboratory validate above presumption.

室内用抗性和敏感亲本及正交杂合子检测的结果验证了上述推测。

At the same time, using the main QTL molecular markers developed by us and China Agricultural University, Combining marker-assisted selection and conventional breeding, making use of the methods of hybrid-backcrossing then self-crossing, molecular marker breeding platform of corn Head Smut resistance will be build.

同时，利用与中国农业大学合作研究开发的主效QTL分子标记，将分子标记辅助选择与常规育种相结合，采用杂交-回交-自交的方法，建立玉米抗丝黑穗病分子标记育种平台。

Genetic Performance of Some Main Characters in Backcrossing Generations of Distant Cross between Winter Wheat and Agropyron

冬小麦与天蓝偃麦草远缘杂交的回交世代中几个主要性状的遗传表现