title: High segregation distortion in  maize B73 x teosinte crosses.
abstract: Two genetic linkage  maps of cultivated maize inbred lines and teosinte species were constructed.  One population comprised 81 F(2) individuals derived  from a cross between maize inbred line B73 and Zea mays ssp parviglumis,  while the second consisted of 63 backcross individuals from a cross of maize  inbred line B73 with Z. mays ssp diploperennis. In the B73 x Z.  mays ssp parviglumis F(2) population, 172 simple  sequence repeat (SSR) markers were mapped to 10 chromosomes, which covered  2210.8 cM. In the B73 x Z. mays ssp diploperennis backcross  population, 258 SSR markers were mapped to 10 chromosomes, covering 1357.7 cM.  Comparison of the two maps revealed that the total map length of Z. mays ssp diploperennis covers 1357.7 cM, which is about 61.4% of that of Z.  mays ssp parviglumis (2210.8 cM). Extensive segregation distortion  regions were found on chromosomes 1, 2, 3, 5, 6, 7, and 10 in the B73 x Z.  mays ssp parviglumis F(2) population and on  chromosomes 1-5 and 8-10 in the B73 x Z. mays ssp parviglumis backcross  population. Segregation distortion analysis confirmed that the segregation  distortion ratio in the interspecific population B73 x Z. mays ssp diploperennis was higher than in B73 x Z. mays ssp parviglumis. We found  that the recombination distances are highly variable in these genetic crosses  between cultivated and wild species of maize.
authors.affiliation: Shanghai Key Laboratory of Bio-Energy Crop, School of Life Sciences, Shanghai University, Shanghai, PR China.
authors.forename: G
authors.initials: G
authors.lastname: Wang
authors.forename: Q Q
authors.initials: QQ
authors.lastname: He
authors.forename: Z K
authors.initials: ZK
authors.lastname: Xu
authors.forename: R T
authors.initials: RT
authors.lastname: Song
mesh_terms: D002874:Chromosome Mapping; D020090:Chromosome Segregation; D032461:Chromosomes, Plant; D003433:Crosses, Genetic; D008040:Genetic Linkage; D005838:Genotype; D018895:Microsatellite Repeats; D011110:Polymorphism, Genetic; D011995:Recombination, Genetic; D003313:Zea mays / Q000235:genetics*