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Abstract Detail

Systematics Section/ASPT

Chung, Kyong-Sook [1], Oh, Byoung-Un  [2], Park, Myung Soon [3], Nam, Bo Mi [3], Chung, Gyu Young [3].

Chromosome number diversity of Ranunculaceae and its evolutionary significance in Korea.

Ranunculaceae is composed of about 62 genera with more than 2,500 species worldwide, and about 100 species in 20 genera occur in South Korea. In this study, we investigated the somatic chromosome numbers of Korean native Ranunculaceae to figure out chromosome number diversity and elucidate evolutionary significance of the diversity in the group. The size, aneuploidy, and ploidy levels of chromosomes classify genera into several groups, exhibiting correlation with species diversity. The Ranunculus type (ca.3–12 μm long) are found in Aconitum, Actaea, Anemone, Cimicifuga, Clematis, Megaleranthis, Hepatica, and Ranunculus; whereas Aquilegia and Ranunculus have the Thalictrum type (ca.1–1.5 μm long). In Aconitum, chromosome numbers in Aconitum subg. Aconitum range from 2n = 16 to 2n = 64 with diverse levels of polyploidy (2x, 4x, and 8x), but Aconitum subg. Lycoctonum exhibits only diploids (2n = 16). Greater chromosome number diversity in the former explains higher species diversity within the Aconitum subg. Aconitum (more than 250 species worldwide). We also report the chromosome numbers of several species for the first time: Clematis fusca var. coreana (H.Lev.) Nakai (2n = 16) and Thalictrum aquilegiifolium var. sibiricum Regel & Tiling (2n = 42). Aconitum japonicum subsp. napiforme (H.Lév. & Vaniot) Kadota (2n = 32), and A. longecassidatum Nakai (2n = 16). The two types of chromosomes in Ranunculus correlated with species diversity suggest that chromosomal differentiation plays an important role in species diversification in the group. Further evaluation of the cytogenetic features of Ranunculaceae in a phylogenetic framework is proposed for a better understanding of the evolutionary history of the species-rich family.

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1 - Jungwon University, Medicinal Plant Science, 85 Munmu-ro Goesan-eup, Goesangun, Chungbuk, 367-700, Korea
2 - Chungbuk National University, Biology, 52 Naesudong-ro, Heungdeok-gu, Cheongju, Chungbuk, 361-763, Korea
3 - Andong National University, Medicinal Plants Resources, 1375 Gyeongdong-ro, Andong, Gyeongbuk, 760-749, Korea

chromosome number
Korean flora.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PSY015
Abstract ID:546
Candidate for Awards:None

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