title: Fine mapping of qhir8 affecting in vivo haploid induction in maize.
abstract: The QTL qhir8 affecting in vivo haploid induction in maize was mapped to a 789 kb region, embryo abortion rate and segregation ratios were analyzed, linkage markers for MAS were developed. The doubled-haploid (DH) technology has become an important tool for line development in modern maize breeding. However, the genetic basis of haploid induction remains elusive. In previous QTL mapping research, qhir8 besides qhir1 significantly affected haploid induction rate (HIR). Our objective was to fine map qhir8 and assess its effect on HIR, segregation distortion (SD) and embryo abortion (EmA). A total of 3989 F2 plants from the cross of inducers CAUHOI and UH400 were screened for recombinants in the qhir8 region. F2 plants and F3 plants from selfing progenies of 34 recombinant F2 plants were evaluated for HIR, SD and EmA. In parallel, we developed 31 new markers providing good coverage of the qhir8 region. We confirmed that qhir8 has an increasing effect on HIR and EmA, but not on SD. Moreover, we successfully narrowed down the qhir8 locus to a 789 kb region flanked by markers 4292232 and umc1867.
authors.affiliation: College of Agriculture and Biotechnology, China Agricultural University, No.2 Yuan Ming Yuan West Road, Haidian District, 100193, Beijing, China.
authors.forename: Chenxu
authors.initials: C
authors.lastname: Liu
authors.affiliation: College of Agriculture and Biotechnology, China Agricultural University, No.2 Yuan Ming Yuan West Road, Haidian District, 100193, Beijing, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.affiliation: College of Agriculture and Biotechnology, China Agricultural University, No.2 Yuan Ming Yuan West Road, Haidian District, 100193, Beijing, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhong
authors.affiliation: College of Agriculture and Biotechnology, China Agricultural University, No.2 Yuan Ming Yuan West Road, Haidian District, 100193, Beijing, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Dong
authors.affiliation: College of Agriculture and Biotechnology, China Agricultural University, No.2 Yuan Ming Yuan West Road, Haidian District, 100193, Beijing, China.
authors.forename: Haixiao
authors.initials: H
authors.lastname: Hu
authors.affiliation: College of Agriculture and Biotechnology, China Agricultural University, No.2 Yuan Ming Yuan West Road, Haidian District, 100193, Beijing, China.
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Tian
authors.affiliation: College of Agriculture and Biotechnology, China Agricultural University, No.2 Yuan Ming Yuan West Road, Haidian District, 100193, Beijing, China.
authors.forename: Lele
authors.initials: L
authors.lastname: Wang
authors.affiliation: College of Agriculture and Biotechnology, China Agricultural University, No.2 Yuan Ming Yuan West Road, Haidian District, 100193, Beijing, China.
authors.forename: Baojian
authors.initials: B
authors.lastname: Chen
authors.affiliation: College of Agriculture and Biotechnology, China Agricultural University, No.2 Yuan Ming Yuan West Road, Haidian District, 100193, Beijing, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Chen
authors.affiliation: Institute of Plant Breeding, Seed Science and Population Genetics, University of Hohenheim, Fruwirthstr. 21, 70593, Stuttgart, Germany. melchinger@uni-hohenheim.de.
authors.forename: Albrecht E
authors.initials: AE
authors.lastname: Melchinger
authors.affiliation: College of Agriculture and Biotechnology, China Agricultural University, No.2 Yuan Ming Yuan West Road, Haidian District, 100193, Beijing, China. chen368@126.com.
authors.forename: Shaojiang
authors.initials: S
authors.lastname: Chen
mesh_terms: D002874:Chromosome Mapping; D018744:DNA, Plant / Q000235:genetics; D008040:Genetic Linkage; D005819:Genetic Markers; D005838:Genotype; D006238:Haploidy; D010641:Phenotype; D000069600:Plant Breeding; D040641:Quantitative Trait Loci; D003313:Zea mays / Q000235:genetics*
chemical_list: D018744:DNA, Plant; D005819:Genetic Markers