title: [Genetic linkage map of Betula pendula Roth and Betula platyphylla Suk based on random amplified polymorphisms DNA markers].
abstract: Based on the genetic inheritance and segregation of random amplified polymorphism DNA (RAPDs) markers, the first mid-density linkage map for silver birch was constructed by using a pseudo-testcross mapping strategy. A segregating population including 80 progenies from the cross between Betula pendula Roth and B. platyphylla Suk was obtained. A set of 1,200 random oligonucleotide primers were screened, and 208 primers were selected to generate RAPD markers within a sample of 80 F1 progenies. A total of 364 segregating sites were identified. Among them, 307 belonged to 1 : 1 segregating site, and 36 belonged to 3 : 1 segregating site, others were found distorted from the normal 1 : 1 ratio. Altogether 307 sites segregating 1 : 1 (testcross configuration) were used to construct parent-specific linkage maps, 145 for B. pendula and 162 for B. platyphylla. The resulting linkage maps consisted of 145 marker sites in 14 groups (four or more sites per group), 6 triples and 6 pairs for B. pendula, which covered the map distance about 955.6 cM (Kosambi units). The average map distance between adjacent markers was 14.9 cM, and 162 linked marker site for B. platyphylla were mapped onto 15 groups (four or more sites per group), 4 triples and 6 pairs, which covered the map distance about 1,545.8 cM, and the average map distance between adjacent markers was 15.2 cM. Further study is warranted to integrate the two maps to one density map and to locate important genes on the maps.
authors.affiliation: Key Laboratory of Forest Tree Improvement and Biotechnology of Ministry of Education, Northeast Forestry University, Harbin 150040, China. tbjiang@yahoo.com
authors.forename: Ting-Bo
authors.initials: TB
authors.lastname: Jiang
authors.forename: Shao-Chen
authors.initials: SC
authors.lastname: Li
authors.forename: Fu-Ling
authors.initials: FL
authors.lastname: Gao
authors.forename: Bao-Jian
authors.initials: BJ
authors.lastname: Ding
authors.forename: Yue-Jun
authors.initials: YJ
authors.lastname: Qu
authors.forename: Xin-Hua
authors.initials: XH
authors.lastname: Tang
authors.forename: Gui-Feng
authors.initials: GF
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Jiang
authors.forename: Chuan-Ping
authors.initials: CP
authors.lastname: Yang
mesh_terms: D029662:Betula / Q000145:classification / Q000235:genetics*; D002874:Chromosome Mapping / Q000379:methods*; D032461:Chromosomes, Plant / Q000235:genetics*; D005819:Genetic Markers / Q000235:genetics; D016133:Polymerase Chain Reaction; D019105:Random Amplified Polymorphic DNA Technique / Q000379:methods*
chemical_list: D005819:Genetic Markers