Origin and Genetic Variation of Agamosporous Ferns(<SPECIAL ISSUE>US-JAPAN SEMINAR : EVOLUTIONARY STUDIES ON SEXUAL SYSTEMS IN PLANTS)

概要

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Two agamosporous fern species, Pteris cretica and Dryopteris yakusilvicola as well as some sexual species related to them were cytologically and enzyme electrophoretically analysed in order to elucidate their genetic variation and its origin. Pteris cretica in Japan has been reported to contain diploid and triploid agamosporous races. Our allozyme data strongly suggested that the agamosporous triploid originated through recurrent hybridization between the diploid agamosporous race of P. cretica and the related sexual species, P. kidoi. Recurrent hybridization with related sexual species can be considered to contribute to increase the genetic variation of this agamosporous species. On the other hand, triploid agamosporous species, D. yakusilvicola was suggested to be of hybrid origin between diploid sexual D. sabaei and the tetraploid sexual race of D. sparsa based on our allozyme data. Moreover, 56 individuals of D. yakusilvicola from various localities which were electrophoretically analyzed showed the same banding pattern. This genotypic uniformity suggests that this species was recently derived through a single hybridization event.
種生物学会の論文
1990-09-30