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  • Author or Editor: Xiulan Xu x
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Li Li, Xiulan Xu, Ping Wu, Guo Zhang and Xiaobing Zhang

Twenty-four representative melon varieties and six parental cultivars were examined in this study. Among 159 pairs of simple sequence repeat (SSR) primers, 18 SSR core primers with rich polymorphic information, a large number of genotypes, and the ability to distinguish different melon varieties were selected. A total of 113 genotypes were detected among the 30 experimental materials, with an average of 6.28 genotypes for each pair of primers. The polymorphic information content was on average 0.6807, ranging from 0.5618 to 0.7885. Specific bands of the primers for the 30 experimental materials were analyzed, and by combining different primer loci, all 30 varieties were identified. Unique barcodes for molecular identity cards for the 30 experimental materials were established using the fingerprints formed with this SSR marker system. Each variety has a unique identity card that can be applied for the registration of the newly bred varieties, the protection of breeders’ rights, and the authenticity of breeds after promulgation of the new Seed Law of the People’s Republic of China.

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Li Li, Ling Liu, Deshuang Zhang, Ping Wu, Fenglan Zhang and Xiulan Xu

Thirteen Chinese cabbage (Brassica rapa) hybrid cultivars and 26 parental inbred lines were used as experimental materials to screen for primers producing hybrid and parental complementary bands and for primers with high polymorphism information contents and low genotype frequencies. A total of 18 pairs of core primers were designed to identify the purity of Chinese cabbage. There was no significant difference in the purity percentage measured between different loci of the same strain. The fingerprint obtained by the amplification of each locus could be used to identify purity to obtain an authentic purity percentage. Curve mapping and significance analyses were conducted using the purity percentage of eight different seed samples and confirmed a sampling seed number of 96. The results of the purity test were verified by comparison with the grow-out test (GOT) using molecular markers. In conclusion, the simple sequence repeat (SSR) detection system could be used for the rapid identification of the purity of the tested Chinese cabbage hybrids.