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Position: Home > Articles > Bacterial artificial chromosome library construction of root-knot nematode resistant pepper genotype HDA149 and identification of clones linked to Me3 resistant locus Journal of Integrative Agriculture 2017,16 (1)

Bacterial artificial chromosome library construction of root-knot nematode resistant pepper genotype HDA149 and identification of clones linked to Me3 resistant locus

作者：

Guo Xiao;Yang Xiao-hui;Yang Yu;Mao Zhen-chuan;Liu Feng;Ma Wei-qing;Xie Bing-yan;Li Guang-cun

单位：

Shandong Acad Agr Sci, Inst Vegetables & Flowers, Mol Biol Key Lab Shandong Facil Vegetable, Jinan 250100, Peoples R China;Chinese Acad Agr Sci, Inst Vegetables & Flowers, Beijing 100081, Peoples R China

关键词：

pepper;bacterial artificial chromosome library (BAC);root-knot nematode;Me3 gene;contig

摘要：

Pepper (Capsicum annuum. L.) is a widely cultivated vegetable crop worldwide and has the second largest planting area and the first largest vegetable output and value in China. Pepper root-knot nematode (Meloidogyne spp.) is one of the most serious pests of pepper, which caused huge losses every year. Previous studies showed that the Me3 gene is resistant to a wide range of Meloidogyne species, including M. arenaria, M. javanica, and M. incognita. HDA149, a double haploid pepper genotype, harboring the root-knot nematode resistance gene Me3, was used to construct bacterial artificial chromosome library (BAC) via the vector of CopyControl (TM) pCC1 in this study. The library consists of 210200 BAC clones and is equivalent to 5.3 pepper genomes. The average insert size is 95 kb, and most of them are 90-120 kb; but the empty clones are less than 3%. In order to screen the BAC library easily, 550 super pools with 384 BAC clones of each pool were further developed in this study. Specific primers from Me3 gene locus were used for BAC library screening, and more than 20 positive BAC clones were obtained. Then the selected positive BAC clones were analyzed by restriction enzyme digestion, BAC-end sequencing, marker development, and new positive BAC clones exploration, respectively. Finally, the contig with total length of about 300 kb linked to the Me3 locus was constructed based on chromosome walking strategy, which made a solid foundation for the cloning of the important root-knot nematode resistance gene Me3.

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Bacterial artificial chromosome library construction of root-knot nematode resistant pepper genotype HDA149 and identification of clones linked to Me3 resistant locus

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