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題 名 | Cytological Features of the Aster ageratoides Complex (Asteraceae) in Taiwan=臺灣產菊科山白蘭複合群(Aster ageratoides complex)植物之染色體細胞學特徵 |
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作 者 | 副島顯子; 彭鏡毅; | 書刊名 | Botanical Bulletin of Academia Sinica |
卷 期 | 39:4 1998.10[民87.10] |
頁 次 | 頁299-302 |
分類號 | 377.2215 |
關鍵詞 | 山白蘭; 絨山白蘭; 菊科; 染色體數; 臺灣; Aster ageratoides; Aster lasioclada; Aster leiophyllus; Asteraceae; Chromosome number; Taiwan; |
語 文 | 英文(English) |
中文摘要 | 本文報導產於臺灣之菊科山白蘭複合群(Aster ageratoides complex)兩種植物 ,山白蘭(Aster ageratoides Franch. et Sav.)與絨山白蘭(Aster lasioclada Hayata) 之染色體細胞學特徵。採樣山白蘭70個體,研究得知其中僅一株為二倍體(2n=18),其餘 皆為四倍體(2n=27,28),由於三倍體植物的生育地同時發現二倍體植物,二者在形態上無 法區別,而臺灣迄未發現四倍體之絨山白蘭,故推測臺灣產三倍體絨山白蘭為二倍體親本之 一在自然界減數分裂異常,產生雙套之配子,與另一個二倍體親本行正常減數分裂產生之單 套配子結合後衍生。 |
英文摘要 | Chromosome cytology was examined in two species of the Aster ageratoides complex, A. ageratoides Turcz.(=A. leiophyllus Franch. et Sav.) and A. lasioclada Hayata, in Taiwan. Of the 70 individuals of A. ageratoides sampled, one was found to be diploid (2n=18) and the rest tetraploid (2n=36, 37). The occurrence of the diploid A. ageratoides in Taiwan appears to be ancient. Eighteen individuals of A. lasioclada were examined, of which 15 were diploids (2n=18) and three triploids (2n=27,28). The triploid plants were not sympatric with tetraploid plants and could not be distinguished morphologically from the diploids; they may represent spontaneously occurring individuals with one unreduced gamete. |
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