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Pak. J. Bot., 47(3): 1069-1074, 2015. |
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Updated: 23-06-15 | ||||
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GENETIC RELATIONSHIP AMONG NINE RHODODENDRON SPECIES IN QINLING MOUNTAINS, CHINA USING AMPLIFIED FRAGMENT LENGTH POLYMORPHISM MARKERS
BING ZHAO*, JING-JING XU AND XI-ZI ZHENG
Abstract: Genetic relationships of nine species of Rhododendron in the Qinling Mountains were evaluated using amplified fragment length polymorphism (AFLP) markers. A total of 440 amplification products were obtained using nine selected AFLP markers, of which 421 (95.40%) showed polymorphism. With these polymorphic products, a dendrogram was constructed using the unweighted pair-group method with arithmetic mean (UPGMA). R. calophytum, R. hypoglaucum and R. clementinae, belonging to Subgen Hymenanthes, gathered together, and the species derived from Subgen Rhododendron and Subgen Tsutsusi formed another two groups. R. tsinlingense, R. purdomii, R. Taibaiense and R. capitatum (Subsect. Lapponica), and R. concinnum (Subsect. Triflora) were clustered as one group, but they belong to difference subsect. and R. purdomii and R. Taibaiense showed the closest genetic distance, but both species differed greatly in morphological characteristics.These results showed that the genetic relationships among nine Rhododendron species, determined by AFLP markers, were partially related to their taxonomic position, geography distribution and morphological classification. The present study will benefit the identification and conservation of Rhododendron, and the development of new Rhododendron cultivar.
Key words : Rhododendron, Genetic relationship, AFLP, Axonomic position, Morphological classification.
College of Forestry, Northwest A&F University, Yangling, 712100, P.R. China *Corresponding authors’ e-mail: bingbing2003915@163.com |
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