1沈阳农业大学 农业部作物生理生态遗传育种重点开放实验室， 辽宁 沈阳 110161； 2中国农业科学院 作物科学研究所/农作物基因资源与遗传改良国家重大科学工程， 北京 100081; 3 International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines； *通讯联系人，E-mail: email@example.com
Response of Main Effect QTL for Plant Height and Flag Leaf Width to Artificial Selection in Rice
WANG Yun1,2, CHENG Li-rui2, ZHENG Tian-qing2, SUN Yong2, ZHOU Zheng2, YANG Jing2, XU Zheng-jin1, XU Jian-long2,*, LI Zhi-kang2,3
1Key Laboratory of Crop Physiology, Ecology, Genetics and Breeding, Ministry of Agriculture;Shenyang Agricultural University, Shenyang 110161, China; 2Institute of Crop Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines; *Corresponding author, E-mail: firstname.lastname@example.org
Artificial selection is a key procedure for animal and plant breeding. To detect response of main effect QTL (M-QTL) in mapping populations to artificial selection, stably expressed M-QTL was identified from backcross inbred lines in Teqing background (TQ-BIL) in Beijing and Hainan. Deviation of the alleles at the stably expressed M-QTLs in the extreme populations selected from TQ-BILs and Lemont/Teqing recombinant inbred lines (RILs) based on different selection intensities (5%, 10% and 20%) was detected, to analyze response of M-QTL of different traits to different selection intensities and effect of different genetic structures on selection response of M-QTL. The results indicated that the deviation of all alleles at M-QTLs identified from TQ-BILs resulted in increase of donor’s alleles in the extreme populations, and the directions of allele deviation and trait selection with allele deviation were consistent with that of additive effect of gene. However, donor’s alleles at M-QTLs were distorted to either increase or decrease in extreme populations selected from RILs. The deviation of alleles at M-QTLs for the two traits in the two kinds of populations was tightly associated with selection intensity. Some false positive and overlooked M-QTLs were found by comparison of M-QTL mapping results and their responses to selection in the populations with different genetic structures. Importance of confirmation was emphasized for the M-QTL identified from mapping populations. Considering characters of selective responses of different M-QTLs for different traits in different populations, utilization and caution of different M-QTLs in backcross breeding based on traditional phenotyping selection and markerassisted selection were discussed.
WANG Yun,CHENG Li-rui,ZHENG Tian-qing et al. Response of Main Effect QTL for Plant Height and Flag Leaf Width to Artificial Selection in Rice [J]. , 2009, 23(4): 363-370 .
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