鳞毛蕨科四个属的染色体数目

报道了鳞毛蕨科的4个属(毛枝蕨属Leptorumohra、石盖蕨属Lithostegia、黔蕨属Phanerophlebiopsis和柳叶蕨属Cyrtogonellum)6种植物的染色体数目及生殖方式。其中柳叶蕨Cyrtogonellum fraxinellum 'n'=123, 2n=123; 离脉柳叶蕨C. caducum 'n'=123; 斜基柳叶蕨C. inaequalis 2n=123; 四回毛枝蕨Leptorumohra quadripinnata n=41; 石盖蕨Lithostegia foeniculacea 2n=164; 长叶黔蕨Phanerophlebiopsis neopodophylla 2n=82。石盖蕨属、黔蕨属和柳叶蕨属的染色体数目为首次报道。结果表明这3个属的染色体基数和鳞毛蕨科中其他属一样均为x=41。细胞学证据支持将石盖蕨属、黔蕨属置于鳞毛蕨科的处理。本文还发现柳叶蕨属与贯众属Cyrtomium的一些种一样, 具有无融合生殖方式, 而其他3个属仅具有在蕨类植物中较为常见的有性生殖方式。

Chromosome numbers of four genera in the Dryopteridaceae

Abstract Chromosome numbers and reproductive types of six species of four genera in the Dryopteridaceae, i.e., Leptorumohra, Lithostegia, Phanerophlebiopsis and Cyrtogonellum were investigated. The chromosome numbers were n=41 in Leptorumohra quadripinnata,inaequalis, respectively. The chromosome numbers for all the genera but Leptorumohra were reported for the first time. The results indicated that the chromosome base number of all the four genera was x=41, a common number in the Dryopteridaceae. The reproductive type in Cyrtogonellum is apogamous whereas in the other three genera it is of the sexual reproductive type, which is widely found in ferns.