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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Nucleotide diversity and linkage disequilibrium in 11 expressed resistance candidate genes in Lolium perenne | BMC Plant Biology BioMed Central Research article Open Access Nucleotide diversity and linkage disequilibrium in 11 expressed resistance candidate genes in Lolium perenne Yongzhong Xing1 2 Uschi Frei1 Britt Schejbel1 Torben Asp1 and Thomas Lubberstedt 1 Address University of Arhus Faculty of Agricultural Sciences Department of Genetics and Biotechnology Research Centre Flakkebjerg Slagelse DK-4200 Denmark and 2National Key Lab of Crop Genetic Improvement Huazhong Agricultural University Wuhan 430070 China Email Yongzhong Xing - yzxing@mail.hzau.edu.cn Uschi Frei - Uschi.Frei@agrsci.dk Britt Schejbel - brittsa@mail.tele.dk Torben Asp - Torben.Asp@agrsci.dk Thomas Lubberstedt - Thomas.Luebberstedt@agrsci.dk Corresponding author Published 4 August 2007 Received II April 2007 BMC Plant Biology 2007 7 43 doi 10.1186 1471-2229-7-43 Accepted 4 August 2007 This article is available from http www.biomedcentral.com I47I-2229 7 43 2007 Xing et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http creativecommons.Org licenses by 2.0 which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background Association analysis is an alternative way for QTL mapping in ryegrass. So far knowledge on nucleotide diversity and linkage disequilibrium in ryegrass is lacking which is essential for the efficiency of association analyses. Results II expressed disease resistance candidate R genes including 6 nucleotide binding site and leucine rich repeat NBS-LRR like genes and 5 non-NBS-LRR genes were analyzed for nucleotide diversity. For each of the genes about I kb genomic fragments were isolated from 20 heterozygous genotypes in ryegrass. The number of haplotypes per gene ranged from 9 to 27. On average one single nucleotide polymorphism SNP was present per 33 bp between two randomly sampled sequences for the II genes. NBS-LRR like .
