Thermo-sensitive genic male sterile （TGMS） lines have specific superiority in heterosis utilization of crops. So far, thermo-sensitive genic male sterile lines have been found in many plants and are widely used in two-line hybrid breeding. With the rapid development of molecular biology, the molecular nature of thermo-sensitive genic male sterility has been revealed, which lays the foundation for further devel- opment and utilization of thermo-sensitive genic male sterile lines. In this study, the molecular mechanisms of fertility conversion of plant thermo-sensitive genic male sterile lines were reviewed from gene molecular mapping and gene differential ex- pression, and the mechanisms of gene differential expression in thermo-sensitive genic male sterile lines were further discussed.
温敏雄性不育系具有育种程序简单、组配自由、育种周期短等优点,已成为杂种优势利用的重要材料。本研究以芥菜型(Brassica juncea L.)油菜温敏雄性不育系K121S与核不育系1161A获得的BCF1为作图群体,利用混合分组分析法(bulked-segregant analysis BSA)对温敏雄性不育系K121S的育性转换基因(Fc)进行定位。结果表明获得2个基于RAPD的SCAR标记与育性转换基因(Fc)连锁,即是SS503-250和SBA485-482,与育性转换基因的遗传距离分别为3.94 c M和7.09 c M。本研究结果为今后育性转换基因的克隆、测序及生物信息学研究并解析K121S育性转换的分子机制机制提供了条件。
本研究以芥菜型油菜(Brassica juncea L.)核不育系1161A和温敏雄性不育系K121S的BCF1为作图群体,采用混合群体分组分析法(bulked segregant analysis,BSA)定位油菜温敏雄性不育系K121S的育性转换基因(Fc)。研究结果表明,从86对多态性SSR引物中获得了5个连锁标记:Ol11-G11a、Na10-F06、Na14-G10、CN48和Br GMS961,其中Ol11-G11a、Na14-G10和Na10-F06等3个SSR标记与K121S育性转换基因的遗传距离较近,分别为1.6 c M、11.0 c M和19.7 c M。本研究结果可为油菜温敏雄性不育系K121S的育性转换基因的图位克隆及其利用提供依据。
[Objective] This study was performed to screen functional genes related to the fertility conversion of thermo-sensitive genic male sterile （TGMS） lines of Brassica juncea L. [Method] A B. juncea TGMS line K121S was selected as the experimental material. The total RNAs were isolated from fertile and sterile pollens at different development stages, including mother cell stage, tetrad stage, tricellular pollen stage and maturity stage. DDRT-PCR was carried out to identify differentially expressed genes. [Result] A total of 44 differentially expressed cDNA fragments were identified with Dot blot. And seven candidate genes related to fertility conversion of K121S were screened out by BLASTN, including callose synthase gene, aldehyde dehydrogenase gene and RNA polymerase I transcription factor RRN3 gene which were differentially expressed at the transcriptional level, H＇-ATPase gene, fructose diphosphate aldolase -class I gene, teucine-rich repeat receptor-Jike serine/threonine- protein kinase gene and alkaline/neutral invertase gene, which were differentially expressed at the post-transcriptional level. [Conclusion] The results of this study will help to explain the molecular mechanism of thermo-sensitive genic male sterility of B. juncea.
Libo SUIHaiyang ZHAOLijun AILiping LIChuanli ZHANGChao SUNTianxiang TANGLiangbin LIN
