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Structure and Dynamics of Natural Populations of Polyploid Trilliums. V. Predominant Self‐pollination in Trillium apetalon‐T. smallii Association
Author(s) -
Uchino Akinori,
Kanazawa Hajime,
Watanabe Hiroshi
Publication year - 1987
Publication title -
plant species biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.419
H-Index - 36
eISSN - 1442-1984
pISSN - 0913-557X
DOI - 10.1111/j.1442-1984.1987.tb00036.x
Subject(s) - biology , pollination , open pollination , polyploid , botany , population , hybrid , interspecific competition , ploidy , pollen , biochemistry , demography , sociology , gene
Predominant self‐pollination was confirmed in mixed populations of Trillium apetalon (4x = 20, SSUU) and T. smallii (6x = 30, K 1 K 1 SSUU). 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.