한국식물분류학회

제51회 정기학술대회

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초록제목

Determination of the chromosome number, karyotype, and genome size of Aster chusanensis and its putative parent species

초록

?Aster chusanensis Y.S.Lim, Hyun, Y.D.Kim & H.C.Shin (Asteraceae Bercht. & Presl) is recently described as a natural hybrid species between A. and A. and is known to be endemic to Island in Korea, which exhibits unique flora with many endemic species. In this study, we determined chromosome numbers, and genome sizes of three species. Chromosome counts showed that three species were all diploid with the chromosome number of 2n = 18 of which A. is first reported here. analysis illustrated that the basic number of x = 9 was confirmed from all species. The chromosome sizes ranged from 4.24 μm (in A. ) to 12.14 μm (in A. ) in length, and all species possessed a pair of SAT-chromosome. As for asymmetry, of three species were classified into symmetry classes of Stebbins as 2A and 3A with a high proportion of and submetacentric chromosome pairs. Genome sizes of A. , A. , and A. were analyzed using flow cytometry (FCM), estimating 3.926pg (±0026), 3.534pg (±0061), and 2.977pg (±0012), respectively. Although, the in flowering plants is known to be common from natural population or cultivation, homoploid hybridization, which is a hybrid without change in chromosome number, is relatively rare. If A. is a natural hybrid species, it may be derived from homoploid hybrid speciation. Our FCM data show the potential for A. to be a natural hybrid, but further investigation is needed as our results target limited populations and individuals.

발표자료 2020 분류학회 초록
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