Structure and Dynamics of Natural Populations of Polyploid Trilliums. V. Predominant Self-pollination in Trillium apetalon-T. smallii Association

概要

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Predominant self-pollination was confirmed in mixed populations of Trillium apetalon (4x=20, SSUU) and T. smallii (6x=30, K_1K_1SSUU). In pollination tests conducted on both species from the Muroran (Mr) population, many good seeds were obtained from bagged flowers as well as open-pollinated intact flowers. In striking contrast, fruits from castrated open-pollinated flowers failed to give any good seeds. In T. smallii in the Usu (Us) population, the same results were obtained for bagged and open-pollinated intact flowers. On the other hand, fruits from castrated open-pollinated flowers yielded only a few good seeds. Although both species were experimentally cross-compatible in both directions, no interspecific hybrids have so far been found in nature. It may be possible that both species are isolated by predominant self-pollinatioin even though their flowering seasons coincide.
種生物学会の論文
1988-03-20