Karyotypes of metaphase chromosomes in diploid populations of<Emphasis Type="Italic"> Dendranthema zawadskii</Emphasis> and related species (Asteraceae) from Korea: diversity and evolutionary implications |
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Authors: | Jung?Sung?Kim Jae-Hong?Pak Bong-Bo?Seo Email author" target="_blank">Hiroshi?TobeEmail author |
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Institution: | (1) Department of Botany, Graduate school of Science, Kyoto University, Kyoto 606-8502, Japan,;(2) Department of Biology, College of Natural Science, Kyungpook National University, Taegu, Korea, |
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Abstract: | Although the Dendranthema zawadskii complex has been known to comprise a series of polyploids (4×, 6×, 8×), we found diploid individuals (with 2n=18) to occur in four populations of D. zawadskii var. latilobum in the southern region of Korea. Karyotypes of metaphase chromosomes were diverse because numbers of metacentric, submetacentric,
and acrocentric chromosomes differ even within a population. A total of 17 karyotypes were found in 31 diploid individuals
collected from the four populations. The karyotypes were also diverse in the presence or absence of chromosomes with a secondary
constriction on a short or long arm and, if present, in the number of such chromosomes. They were further diverse in the presence
or absence of non-homologous chromosome(s), the presence or absence of a chromosome with a satellite, and, if present, how
many and where satellites are present. Almost the same pattern of diversity was found in diploid individuals (with 2n=18) of D. boreale and D. indicum as well, irrespective of whether they occur together with D. zawadskii var. latilobum or not. Structural features of chromosomes in the variously different karyotypes suggest that reciprocal translocation and
the hybridization between individuals with different karyotypes had repeatedly occurred not only in D. zawadskii var. latilobum, but also in D. boreale and D. indicum. Morphologically intermediate individuals between D. zawadskii var. latilobum and D. indicum suggests that the hybridization occur with different species as well.
Electronic Publication |
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Keywords: | Asteraceae Dendranthema boreale Dendranthema indicum Dendranthema zawadskii Diploid Karyotype |
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