Natural Hybridization between Aster ageratoides Var. scaberulus and Kalimeris indica (Asteraceae): Evidence from Morphology, Karyotype, and ITS Sequences

微糙三脈紫菀和馬蘭（菊科）的天然雜交：來自形態學、核型和ITS序列分析的證據

黎維平(Wei-Ping Li)

《Botanical Studies》 47卷2期 (2006/04) Pp. 191-197

摘要

一個天然雜種在中國湖南省衡山被發現。對該雜種及其二親本種的形態、核型和ITS序列進行比較後發現，該雜種是微糙三脈紫菀(Aster ageratoides var. scaberulus)和馬蘭(Kalimeris indica)之間雜交的子一代。基於對雜種形態和核型的觀察，本研究表明紫菀屬(Aster)和馬蘭屬(Kalimeris)之間的雜交是造成冠毛變短和形成特殊核型（LS型）的一個途徑，也可能是造成紫菀屬和馬蘭屬之間界線難於劃分的原因之一。而且本研究還顯示核型研究對於澄清紫菀屬和馬蘭屬之間的某些分類學混亂可能是特別有效的。

關鍵字

紫菀屬 ； 天然雜交 ； 馬蘭屬 ； 冠毛 ； 核型

並列摘要

A new natural hybrid from the Hengshan Mountain in Hunan Province, China, was found. Comparisons of morphology, karyotype, and ITS sequences among the hybrid and its parental species show that the hybrid represents F1 progeny from hybridization between Aster ageratoides var. scaberulus and Kalimeris indica. Based on morphological and karyotypical observations of the hybrid, this study suggests that natural hybridization between Aster and Kalimeris could have lead to the shortening of the pappus and a special karyotype (LS-type) and makes the delimiting of Aster and Kalimeris difficult. This study also indicates that karyotype investigations may be particularly useful in resolving some of the taxonomic confusion between Aster and Kalimeris.

並列關鍵字

Aster ； Kalimeris ； Karyotype ； Natural hybridization ； Pappus