箱根山地およびその近接域におけるシロヨメナ群の核学的研究
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概要
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In this study, 185 plants of Aster ageratoides subsp. leiophyllusvar. leiophyllus, collected from the 18 localities in Hakone mountain range and adjacent area, were studied karyologically and distribution of the polyploids (2x, 4x, 6x; x=9) as investigated (Table 1, Fig. 3). The diploids distributed in Mt. Kamiyama and its circumferences, and its southwest region, and the tetraploids were in the north region of the old somma of Hakone volcano and its adjacent north and west regions. And the hexaploids were found the extend in the southwest and northeast regions of the Hakone mountain range. The coexistence of diploids and tetlaploids was found in the only one locality of Sengokubara (2SH). The nine natural hybrid (2n=45+1B) were found in the three localities (2KH, 2CH, 2YH), and had organized from the cross between hexaploid form of var. leiophyllus (2n=54+Bs) and A, ageratoides subsp. ouatus (2n=36). Furthermore, the one hybrid in the hexaploid form with seven B chromosomes (2n=54+7B) was found in a locality of Miyanoshita (2MYH). originated from the cross between the same taxaas mentioned above and aposibilty of origin of this hybrid was discussed on the basis of addition of three types of B chromosomes. The polymorphism of the L^<2E> - chromosome (SAT-chromosome) was studied and then the 10 types were recognized. The polymorphism was more extreme in higher level of polyploidy and showed a tendency increasing of the types with a shorter short arm. For example, of the 10 types the II was predominant in the diploids and the tetraploids, especially ih the diploids, and the II 2a was in hexaploids. B chromosomes were found in the every ploidies and 16 of the 18 localities studied. In the tetraploid and hexaploid populations with high occurrence of B chromosomes, some plants were found for the first time having B chromosomes with higher number such as seven, eleven or twelve. The correlation between polyploid differentiation and distribution and high occurrence of B chromosomes was discussed.
- 横浜国立大学の論文
- 1993-03-27
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