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Construction And Characterization Of Two Citrus BAC Libraries And Identification Of Clones Containing The Phytoene Synthase Gene.

M. N. Baig, An Yu, Wen-wu Guo, X. Deng
Published 2009 · Biology, Medicine

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Two deep-coverage Bacterial Artificial Chromosome (BAC) libraries of Citrus sinensis (L.) Osbeck 'Cara Cara' navel orange and Citrus reticulata (L.) Blanco 'Egan No. 1' Ponkan mandarin, which belong to the two most important species of the Citrus genus, have been constructed and characterized to facilitate gene cloning and to analyze variety-specific genome composition. The C. sinensis BAC library consists of 36 000 clones with negligible false-positive clones and an estimated average insert size of 126 kb covering ~4.5 x 109 bp and thus providing an 11.8-fold coverage of haploid genome equivalents, whereas the C. reticulata library consists of 21 000 clones also with negligible false-positive clones and an estimated average of 120 kb covering ~2.5 x 109 bp representing a 6.6-fold coverage of haploid genome equivalents. Both libraries were evaluated for contamination with high-copy vector, empty pIndigoBAC536 vector, and organellar DNA sequences. Screening has been performed by Southern hybridization of BAC filters, which results in <0.5% chloroplast DNA contamination and no mitochondrial DNA contamination in both libraries. Eight and five positive clones harboring the gene encoding Phytoene synthase (Psy (EC 2.5.1.32)) were identified from the C. sinensis and C. reticulata libraries, respectively, using the filter hybridization procedure. These results suggest that the two BAC libraries are useful tools for the isolation of functional genes and advanced genomics research in the two important species C. sinensis and C. reticulata. Resources, high-density filters, individual clones, and whole libraries are available for public distribution and are accessible at the National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University.
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