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(American Journal of Botany. 1999;86:436-446.)
© 1999 Botanical Society of America, Inc.

Variation of breeding system, floral rewards, and reproductive success in clonal Calystegia species (Convolvulaceae)1

Atushi Ushimaru2 and Kihachiro Kikuzawa

Center for Ecological Research, Kyoto University, Kyoto 606-8502, Japan

The reproductive biology of four Japanese Calystegia species (Convolvulaceae) was studied to examine the effects of clonality and population structure on reproductive success. Calystegia soldanella, C. hederacea, and C. japonica are self-incompatible, while C. sepium is self-compatible but needs pollinator services for self-pollination. The showy, bisexual flowers of Calystegia offer pollen and nectar that attract many kinds of insects such as bees and syrphid flies. Clones of C. soldanella often formed mats just above the high tide line on beaches and produced a great number of seeds. Calystegia hederacea and C. japonica were distributed as patches of separate clones and often failed to transfer pollen grains among clones. Fruit and seed sets in C. hederacea and C. japonica were not limited by pollinators but by the number of compatible pollen grains. Although C. sepium clones were also distributed in patches, high and stable fecundity was achieved by self-compatibility and pollinator attraction. We suggest that self-compatibility in C. sepium has evolved under fertilization limitation caused by geitonogamy or facilitated selfing.

Key Words: Calystegia • clonal plant • Convolvulaceae • self-compatibility • fertilization limitation




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O. Totland and M. Sottocornola
Pollen limitation of reproductive success in two sympatric alpine willows (Salicaceae) with contrasting pollination strategies
Am. J. Botany, June 1, 2001; 88(6): 1011 - 1015.
[Abstract] [Full Text] [PDF]


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