日本産ヤブソテツ属の染色体数と生殖様式

概要

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The result of our studies are as follows (see Table 3): (1) Cyrtomium atropunctatum Kurata, C. falcatum (L. f.) Pr. (Strain II), C. fortunei J. Sm. var. clivicola (Makino) Tagawa, and C. macrophyllum (Makino) Tagawa var. tukusicola (Tagawa) Tagawa are considered as triploid apomicts, becouse 123 bivalent chromosomes in meiosis and 8 spore mother cells per sporangium were observed in these ferns. (2) Gametophytes of Cyrtomium balansae (Christ) C. Chr., C. hookerianum (Pr.) C. Chr. and the diploid (strain I) of C. falcatum produce both archegonia and antheridia on the underside of their thalli and then the embryo develop on their prothallia. Thus, the reproductive modes of these ferns can be regarded to be sexual. On the other hand, each gametophyte of C. atropunctatum (3x), C. falcatum (strain II, 3x), C. fortunei J. Sm. var. intermedium Tagawa and C. macrophyllum var. tukusicola (3x), C. microindusium Kurata produce only antheridia and then the apogamous buds develop on their prothallia. Thus, the reproductive modes of these ferns are apogamous.
国立科学博物館の論文