title: Morphological Structure and Transcriptome Comparison of the Cytoplasmic Male Sterility Line in Brassica napus (SaNa-1A) Derived from Somatic Hybridization and Its Maintainer Line SaNa-1B.
abstract: SaNa-1A is a novel cytoplasmic male sterility (CMS) line in Brassica napus derived from progenies of somatic hybrids between B.napus and Sinapis alba, and SaNa-1B is the corresponding maintainer line. In this study, phenotypic differences of floral organs between CMS and the maintainer lines were observed. By microscope observation in different anther developmental stages of two lines, we found the anther development in SaNa-1A was abnormal since the tetrad stage, and microspore development was ceased during the uninucleate stage. Transcriptomic sequencing for floral buds of sterile and fertile plants were conducted to elucidate gene expression and regulation caused by the alien chromosome and cytoplasm from S. alba. Clean tags obtained were assembled into 195,568 unigenes, and 7811 unigenes distributed in the metabolic and protein synthesis pathways were identified with significant expression differences between two libraries. We also observed that genes participating in carbon metabolism, tricarboxylic acid cycle, oxidative phosphorylation, oxidation-reduction system, pentatricopeptide repeat, and anther development were downregulated in the sterile line. Some of them are candidates for researches on the sterility mechanism in the CMS material, fertility restoration, and improvement of economic traits in the maintainer line. Further research on the tags with expressional specificity in the fertile line would be helpful to explore desirable agronomic traits from wild species of rapeseed.
authors.affiliation: Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University Yangzhou, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Du
authors.affiliation: Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University Yangzhou, China.
authors.forename: Qier
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University Yangzhou, China.
authors.forename: Xinyue
authors.initials: X
authors.lastname: Wu
authors.affiliation: Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University Yangzhou, China.
authors.forename: Jinjin
authors.initials: J
authors.lastname: Jiang
authors.affiliation: Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University Yangzhou, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.affiliation: Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University Yangzhou, China.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Fang
authors.affiliation: Institute of Agricultural Sciences for Lixiahe Region in Jiangsu, Jiangsu Academy of Agricultural Sciences Yangzhou, China.
authors.forename: Aimin
authors.initials: A
authors.lastname: Li
authors.affiliation: Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University Yangzhou, China.
authors.forename: Youping
authors.initials: Y
authors.lastname: Wang
keywords: Brassica napus; cytoplasmic male sterility (CMS); morphological structure; somatic hybridization; transcriptomic analysis