ハコネギク(Aster viscidulus MAKINO)の核学的研究

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In the plants collected from Hakone, Kanagawa Prefecture, chromosome number of Aster viscidulus was reported as 2n=18 of diploidy and mitotic metaphase karyotype was also analysed by HUZIWARA (1957a). In the present study, 176 plants collected from nine populations located at the central region of the Honshu of Japan, which were covering a distribution area of this species, were studied karyologically. 174 (98.9%) of the 176 plants were found to be diploids with 2n=18, and the remaining two plants (1.1%) were a triploid with 2n=27 and an aneuploid with 2n=19. Though the majority of diploids was karyologically similar to each other, the two plants of the diploids were structural heterozygotes which were characterized by chromosomal structural changes occurred in short arm including satellite of SAT-chromosome (L^<2E>-chromosome, SHIMOTOMAI and HUZIWARA, 1942). The triploid plant was determined as an autotriploid by mitotic chromosome analyses and meiotic pairing analyses, and was presumed to be derived by fertilization between reduced and unreduced gametes. In the aneuploid plant, a surplus chromosome was shorter than ordinary chromosomes and 1.8μm in length at mitotic metaphase, and euchromatic in chromatin condensation (Heitz, 1928). In PMCs, pairing between the surplus chromosome and any of ordinary chromoseme was not found. The ten plants from a population of A. viscidulus var. alpinus, which grow in alpine zone, were also examined. There was no difference in karyological characters between A. viscidulus and the variety. It is safely said that A. viscidulus might be genetically stable.
横浜国立大学の論文
1990-03-25

ハコネギク(Aster viscidulus MAKINO)の核学的研究

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