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American Journal of Botany, Vol 85, 225, Copyright © 1998 by Botanical Society of America, Inc.

REPRODUCTIVE BIOLOGY

Modification of phenotypic and functional gender in the monoecious Arum italicum (Araceae)

M Méndez

Other than studies on sex-labile Arisaema species, studies of gender patterns in Araceae are scarce. The modification of phenotypic and functional gender was investigated in three populations of the monoecious Arum italicum Miller. The probability of reproduction and the number of inflorescences produced increased with plant size, and flower number (total, male, staminodes, female, pistillodes) increased with both plant and inflorescence sizes. However, plant and inflorescence sizes were poor predictors of floral sex ratio (female to male flower ratio). In contrast, change in floral sex ratio towards increasing femaleness was found among inflorescences sequentially produced by a plant. This change could not be explained by either a decrease in inflorescence size or a change in the mating environment. Differences in functional gender did not appear to be related to plant size or stage in the flowering period. Instead, different patterns of functional gender were found between plants with different number of inflorescences. Multi-inflorescence plants showed a functional gender around 0.5, while plants with one inflorescence showed a more extreme functional gender (either male, female, or functionally sterile). Sex of flowers in this species did not seem to exhibit a phenotypic trade-off.


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S.-Q. HUANG, S.-G. SUN, Y. TAKAHASHI, and Y.-H. GUO
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Flowering dynamics in Arum italicum (Araceae): relative role of inflorescence traits, flowering synchrony, and pollination context on fruit initiation
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Sexual mass allocation in species with inflorescences as pollination units: a comparison between Arum italicum and Arisaema (Araceae)
Am. J. Botany, October 1, 2001; 88(10): 1781 - 1785.
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Sex allocation and reproductive success in the andromonoecious perennial Solanum carolinense (Solanaceae). I. Female
Am. J. Botany, February 1, 1999; 86(2): 278 - 286.
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Copyright © 1998 by the Botanical Society of America, Inc.