title: Sequencing of the chloroplast genomes of cytoplasmic male-sterile and male-fertile lines of soybean and identification of polymorphic markers.
abstract: The RN-type cytoplasmic male sterility (CMS) system used to develop Hybsoy-1, the first commercial hybrid soybean, has been subsequently applied to generate nearly all released soybean hybrids. Although more than 3 years are needed to classify sterile (S) and normal male-fertile (F) cytoplasms by conventional crossing, such classifications can be performed rapidly using organellar DNA-based molecular markers. Except for fertility, the agronomic traits of CMS hybrid soybean sterile and maintainer lines are identical. Consequently, it is difficult to distinguish them by routine visual inspection in the mixture arising in the course of field planting and harvesting during breeding. In this study, we performed next-generation sequencing of chloroplast DNAs of F- and S-cytoplasmic soybeans, assembled and annotated the genomes, and identified polymorphisms distinguishing them. Chloroplast DNAs of F and S cytoplasms were very similar in size (152,215 and 152,222 base pairs) and GC contents (35.37%). Among 23 shared SNPs in gene coding regions, we identified four that could be used in conjunction with restriction endonucleases to distinguish S and F cytoplasms. Although CMS is likely associated with mitochondrial DNA, maternal transmission of mitochondrial and chloroplast DNAs allows polymorphisms in either genome to be used to classify soybean cytoplasms, aiding hybrid soybean cultivar development.
authors.affiliation: College of Agriculture, Northeast Agricultural University, Harbin 150030, PR China; Jilin Academy of Agricultural Sciences, Changchun 130033, PR China.
authors.forename: Chunjing
authors.initials: C
authors.lastname: Lin
authors.affiliation: Jilin Academy of Agricultural Sciences, Changchun 130033, PR China; National Engineering Research Center for Soybean, Changchun 130033, PR China.
authors.forename: Chunbao
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Jilin Academy of Agricultural Sciences, Changchun 130033, PR China.
authors.forename: Hongkun
authors.initials: H
authors.lastname: Zhao
authors.affiliation: Jilin Academy of Agricultural Sciences, Changchun 130033, PR China.
authors.forename: Shaochen
authors.initials: S
authors.lastname: Xing
authors.affiliation: Jilin Academy of Agricultural Sciences, Changchun 130033, PR China.
authors.forename: Yumin
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Jilin Academy of Agricultural Sciences, Changchun 130033, PR China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Liu
authors.affiliation: Jilin Academy of Agricultural Sciences, Changchun 130033, PR China.
authors.forename: Cuiping
authors.initials: C
authors.lastname: Yuan
authors.affiliation: Jilin Academy of Agricultural Sciences, Changchun 130033, PR China; National Engineering Research Center for Soybean, Changchun 130033, PR China. Electronic address: lmzhao@cjaas.com.
authors.forename: Limei
authors.initials: L
authors.lastname: Zhao
authors.affiliation: College of Agriculture, Northeast Agricultural University, Harbin 150030, PR China; Jilin Academy of Agricultural Sciences, Changchun 130033, PR China; National Engineering Research Center for Soybean, Changchun 130033, PR China. Electronic address: yingshandong@hotmail.com.
authors.forename: Yingshan
authors.initials: Y
authors.lastname: Dong
mesh_terms: D001483:Base Sequence; D003593:Cytoplasm / Q000235:genetics; D018742:DNA, Chloroplast / Q000235:genetics; D005298:Fertility / Q000235:genetics; D005819:Genetic Markers; D054628:Genome, Chloroplast / Q000235:genetics*; D058977:Molecular Sequence Annotation; D051479:Plant Infertility / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D015183:Restriction Mapping; D017422:Sequence Analysis, DNA; D013025:Glycine max / Q000235:genetics*
chemical_list: D018742:DNA, Chloroplast; D005819:Genetic Markers
keywords: Cytoplasmic male sterility; Maintainer line; Molecular marker; Soybean; Sterile line