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Sun X.,Nanjing Agricultural University | Sun X.,Key Laboratory of Biology and Genetic Improvement of Horticultural Crops East China | Wang Y.,Nanjing Agricultural University | Wang Y.,Key Laboratory of Biology and Genetic Improvement of Horticultural Crops East China | And 11 more authors.
Acta Physiologiae Plantarum | Year: 2013

Cytoplasmic male sterility (CMS) is a maternally inherited trait, which becomes an important way in heterosis breeding to simplify the seed production procedures and reduce the production cost. Cytological observation of pollen development stages showed a clear difference between the newly developed CMS line and its maintainer; the profiling comparisons between floral buds of CMS line and its maintainer were conducted using differential display reverse transcription PCR (DDRT-PCR) technology. Thirty genes were up-regulated and sixty genes were down-regulated in newly developed CMS line when compared with its maintainer. These genes were involved in cell wall biosynthesis and regulation, transporter and ion channel, flower development and protein metabolism, etc. Expression patterns of six genes encoding RsCAM6, RsGPI, RsPMEI, RsRac, RsCHS, and RsSTP9 were verified by RT-PCR and qRT-PCR in different development stage of floral buds and different organs of CMS line and its maintainer. The expression level of RsRac was higher in stamens and microspores of CMS line than in maintainer. In comparison, the expression levels of the other five genes in CMS line were lower compared with maintainer. This expression profile suggests that these genes played important roles in the development of the pollen and may be closely related to male sterility. The results observed in this study will contribute to understanding the mechanism of pollen abortion during CMS in radish. © 2013 Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków.

Nie S.,Nanjing Agricultural University | Nie S.,Key Laboratory of Biology and Genetic Improvement of Horticultural Crops East China | Li C.,Nanjing Agricultural University | Li C.,Key Laboratory of Biology and Genetic Improvement of Horticultural Crops East China | And 13 more authors.
BMC Genomics | Year: 2016

Background: The appropriate timing of bolting and flowering is pivotal for reproductive success in Brassicaceae crops including radish (Raphanus sativus L.). Although several flowering regulatory pathways had been described in some plant species, no study on genetic networks of bolting and flowering regulation was performed in radish. In this study, to generate dataset of radish unigene sequences for large-scale gene discovery and functional pathway identification, a cDNA library from mixed radish leaves at different developmental stages was subjected to high-throughput RNA sequencing (RNA-seq). Results: A total of 54.64 million clean reads and 111,167 contigs representing 53,642 unigenes were obtained from the radish leaf transcriptome. Among these, 50,385 unigenes were successfully annotated by BLAST searching against the public protein databases. Functional classification and annotation indicated that 42,903 and 15,382 unique sequences were assigned to 55 GO terms and 25 COG categories, respectively. KEGG pathway analysis revealed that 25,973 unigenes were classified into 128 functional pathways, among which 24 candidate genes related to plant circadian rhythm were identified. Moreover, 142 potential bolting and flowering-related genes involved in various flowering pathways were identified. In addition, seven critical bolting and flowering-related genes were isolated and profiled by T-A cloning and RT-qPCR analysis. Finally, a schematic network model of bolting and flowering regulation and pathways was put forward in radish. Conclusions: This study is the first report on systematic identification of bolting and flowering-related genes based on transcriptome sequencing and assembly in radish. These results could provide a foundation for further investigating bolting and flowering regulatory networks in radish, and facilitate dissecting molecular genetic mechanisms underlying bolting and flowering in Brassicaceae vegetable crops. © 2016 Nie et al.

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