Genetic Variation and Genetic Structure of Representative Species of Malus Mill
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There are thirty-five species of Malus Mill. at least all over the world. China is a center of diversity for Malus Mill. with 27 native species including 21 wild species and 6 domesticated species. Among all these species, Malus baccata is the most widely distributed and diverse species of Malus. Malus sieversii is a relic species from the Tertiary period and has been confirmed by many scholars as the primitive ancestor of modern cultivated apples. Malus prunifolia is one of the cultivated species of Malus in China. Malus prunifolia has a long history of cultivation in various regions and is o...
There are thirty-five species of Malus Mill. at least all over the world. China is a center of diversity for Malus Mill. with 27 native species including 21 wild species and 6 domesticated species. Among all these species, Malus baccata is the most widely distributed and diverse species of Malus. Malus sieversii is a relic species from the Tertiary period and has been confirmed by many scholars as the primitive ancestor of modern cultivated apples. Malus prunifolia is one of the cultivated species of Malus in China. Malus prunifolia has a long history of cultivation in various regions and is one of the traditional fruits in China. It has been widely distributed by humans in history and has been cultivated in North China, Northwest China, Northeast China, and East China. Malus robusta has been cultivated for more than two thousand years in China and now it has been used for rootstocks. These four species are typical representative species of Malus. Simple sequence repeat (SSR) detection with tailed primer M13(TP-M13-SSR) was used in the studies on genetic relationship and diversity for Malus robusta from Hebei province. 19 pairs of polymorphic SSR primers were screened to detect the polymorphism of Malus baccata from 7 sources. Genetic diversity and population structure analysis was carried out on the newly collected cultivated species Malus prunifolia using the fluorescent labelled SSR molecular markers. Four intergenic region in chloroplast genome of 49 newly collected germplasms of Malus prunifolia, 242 germplasms of Malus sieversii (Ledeb.) M. Roem. from 3 sources of Xinjiang Uygur Autonomous Region of China and 215 germplasms of Malus baccata were amplified by four primers, and their genetic variation was analyzed. Genetic diversity of Malus baccata, Malus sieversii, Malus prunifolia and Malus robusta and the phylogenetic relationship among different populations were explored from the perspective of maternal inheritance, which provided a theoretical basis for origin and genetic evolution, collection and protection of important perspective species in China.
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