title: Quantitative trait loci mapping of dark-induced senescence in winter wheat (Triticum aestivum).
abstract: In order to explore the genetics of dark-induced senescence in winter wheat (Triticum aestivum L.), a quantitative trait loci (QTL) analysis was carried out in a doubled haploid population developed from a cross between the varieties Hanxuan 10 (HX) and Lumai 14 (LM). The senescence parameters chlorophyll content (Chl a+b, Chl a, and Chl b), original fluorescence (Fo), maximum fluorescence level (Fm), maximum photochemical efficiency (Fv/Fm), and ratio of variable fluorescence to original fluorescence (Fv/Fo) were evaluated in the second leaf of whole three-leaf seedlings subjected to 7 d of darkness. A total of 43 QTLs were identified that were associated with dark-induced senescence using composite interval mapping. These QTLs were mapped to 20 loci distributed on 11 chromosomes: 1B, 1D, 2A, 2B, 3B, 3D, 5D, 6A, 6B, 7A, and 7B. The phenotypic variation explained by each QTL ranged from 7.5% to 19.4%. Eleven loci coincided with two or more of the analyzed parameters. In addition, 14 loci co-located or were linked with previously reported QTLs regulating flag leaf senescence, tolerance to high light stress, and grain protein content (Gpc), separately.
authors.affiliation: State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Li
authors.forename: Fanyun
authors.initials: F
authors.lastname: Lin
authors.forename: Gui
authors.initials: G
authors.lastname: Wang
authors.forename: Ruilian
authors.initials: R
authors.lastname: Jing
authors.forename: Qi
authors.initials: Q
authors.lastname: Zheng
authors.forename: Bin
authors.initials: B
authors.lastname: Li
authors.forename: Zhensheng
authors.initials: Z
authors.lastname: Li
mesh_terms: D002734:Chlorophyll / Q000378:metabolism; D003624:Darkness; D005453:Fluorescence; D010641:Phenotype; D018515:Plant Leaves / Q000378:metabolism; D040641:Quantitative Trait Loci; D013223:Statistics as Topic; D014908:Triticum / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism
chemical_list: D002734:Chlorophyll