Polyploids and Distribution of Aster ageratoides subsp. leiophyllus Group in the Kanto District and Surrounding Area. III
| Autor: | Matsuda, Tadao, Shishido, Osamu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1988 |
| Předmět: | |
| Zdroj: | 横浜国立大学理科紀要. 第二類, 生物学・地学. 35:23-31 |
| ISSN: | 0513-5613 |
| Popis: | In order to make further survey of distribution of polyploids in the Aster ageratoides subsp. leiophyllus group in the Kanto District and surrounding area, 33 localities having 269 plants were studied karyologically. They were collected from five localities of the District and 28 from the Tohoku District located at the northern regions beyond the Kanto District. In the five localities in the Kanto District, diploids, tetraploids and hexaploids were detected and aneuploids by the addition of B-chromosomes were found in the diploids and the tetraploids as in the previous reports. In the 28 localities of the Tohoku District, only the tetraploids were confirmed and B-chromosome was not found in them at all. The polymorphism of the L^-chromosomes studied in the tetraploids from the Tohoku District and then the five types were recognized. Of the five types, the II1a was predominant (75.2%) and the II2a was found with the second highest frequency (15.3%). The predominant occurrence of these two types in the District is absolutely the same as in the tetetraploids investigated before. 関東地方およびその周辺地域のシロヨメナ群における倍数体の出現とその分布を更に調べる為に,関東地方の5集団と東北地方の28集団から採集した269株を核学的に調べた。関東地方の集団には,二倍体,四倍体および六倍体が確認され,二倍体と四倍体にはB-染色体の付加による異数体が見いだされた。東北地方の27集団の株はすべて四倍体であり,B-染色体は全く見出だされなかった。また,東北地方の四倍体でL^-染色体の多型性を調べたところ,5型が区別された。これらの内II1aが最も高頻度(75.2%)に出現し,次いでII2a (15.3%)であった。これら二型の高頻度出現は,前報の四倍体における結果と同じであった。 |
| Databáze: | OpenAIRE |
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