Abstract
Self-incompatibility (SI) is one important factor that can result in Citrus seedlessness. However, the molecular mechanism of SI in Citrus is not clear yet. To isolate the pistil’s SI-related genes, a suppression subtractive hybridization library was constructed using mature pistils of ‘Wuzishatangju’ mandarin (SI) as the tester and mature pistils of ‘Shatangju’ mandarin (self-compatibility, SC) as the driver. 229 differentially expressed cDNA clones from 967 positive clones were sequenced and identified. Differentially expressed ESTs are possibly involved in the SI reaction of ‘Wuzishatangju’ through a regulating signaling pathway, serine/threonine phosphatase activity, receptor kinase, embryonic development, gibberellin stimulus, or transcription. 11 out of 36 SI candidate genes displayed different expression patterns in various tissues and stages after self- and cross-pollination of ‘Wuzishatangju’. The expression of CaBP (WY65), a senescence-protease (WY372), an unknown gene (WY283), and a WRKY (WY17) were up-regulated in the styles of ‘Wuzishatangju’ while higher expression of WY190 was observed in styles of ‘Shatangju’. Highest expression levels of WY65, WY372, an annexin (WY598), the zinc-finger protein (WY376), a C2-protein (WY291), and an unknown gene (WY318) were detected in styles at 3 days after self-pollination of ‘Wuzishatangju’ while lowest levels were observed in styles at 3 days after cross-pollination of ‘Wuzishatangju’ × ‘Shatangju’. The potential involvement of these genes in the SI reaction is discussed.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (31000899), a Research Fund for the Doctoral Program of Higher Education of China (20104404120015 and 20114404110018), Guangdong Province Science Foundation of China (06025843), Science and Technology Planning Project of Guangzhou (2010r1-C771), and “211” Construction Fund for Key Subjects of College of Horticulture, South China Agricultural University.
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Miao, H., Qin, Y., da Silva, J.A.T. et al. Identification of differentially expressed genes in pistils from self-incompatible Citrus reticulata by suppression subtractive hybridization. Mol Biol Rep 40, 159–169 (2013). https://doi.org/10.1007/s11033-012-2045-6
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DOI: https://doi.org/10.1007/s11033-012-2045-6