Recent Topics Posters
Jeong, KeumSeon , Masayuki, Maki , Pak, Jae-Hong .
ITS sequence variation and phylogenetic relationships of the Galium trachyspermum group (Rubiaceae).
The G.trachygalium group (Galium L., sect. cymogaliae) consists of 4 species; G. trchyalium, G, pogonanthum, G. gracilens, and G. koreanum as Korea endemic, which occurs in Korea and Japan. The taxa are characterized by whorls of four leaf-like organs, cymose of inflorescences with several terminal flowers, 4-parted, rotate flowers. The identification and delimitation of these species is usually a difficult task, because they appear very similar in morphology. The four species are distinguished by differences in leaf size, shape, and fruit hairs, but it is sometimes difficult to discriminate among them and have been observed high variation of morphological characters. These taxa usually occur in the near population, respectively, but they sometimes share a common habitat. The chromosome number of these species are various, 2X (2n=22) and 4X (2n=44). To understand for relationship among the taxa and process of speciation, we performed molecular phylogenetic analyses using nrDNA ITS region of species belonging to G. trachygalium group. Cloning and sequencing analyses for 37 of samples have revealed a pattern of reticulate evolution within the group. All individuals had polymorphism of the ITS sequences, and 12 different ribotypes were detected. Also, particular ribotypes in a species were often found in the different taxa in the group. That phenomenon could probably originate from hybridzation between polyploidy hybrids and/or introgression events.
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1 - Kyungpook National University, Biology, Department of Biology, College of Natural Sciences Kyungpook National University, Daegu 702-701, Korea, Daegu
2 - Tohoku University, Division of Ecology and Evolutionary Biology, Division of Ecology and Evolutionary Biology, Graduate school of Life Sciences, Tohoku University, Aoba, Sendai 980-8578, Japan, Sendai
3 - Kyungpook National University, Department of Biology, Department of Biology, College of Natural Sciences Kyungpook National University, Daegu 702-701, Korea;
Presentation Type: Recent Topics Poster
Location: Battelle South/Convention Center
Date: Monday, July 9th, 2012
Time: 5:30 PM