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American Journal of Botany, Vol 84, 298, Copyright © 1997 by Botanical Society of America, Inc.

STRUCTURE AND DEVELOPMENT

Structural analysis of female and hermaphroditic flowers of a gynodioecious tree, Ocotea tenera (Lauraceae)

JP Gibson and PK Diggle

The evolution of gynodioecy from hermaphroditism involves modifications of floral structure such that male or female fitness is enhanced in hermaphrodites and females, respectively. We present an analysis of structural specialization of flowers of Ocotea tenera, in order to evaluate gender system evolution in this tropical tree species. Significant morphological and anatomical variation was found between high fruiting and low or nonfruiting trees. Female flowers were significantly smaller than hermaphroditic flowers, produced no viable pollen, and made relatively greater allocation to structures that increase female fitness. Hermaphroditic flowers were significantly larger than female flowers, produced copious quantities of pollen, and made relatively greater allocation to male structures. Analyses indicated that changes in allometries between whole-flower growth and growth of reproductive structures may have occurred, which enhance function of the flower and plant as a male or female. Efficiency of nutrient allocation for reproduction is argued to be a factor driving gender system evolution in Ocotea tenera.


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T. Rodriguez-Riano and A. Dafni
Pollen Stigma Interference in Two Gynodioecious Species of Lamiaceae with Intermediate Individuals
Ann. Bot., August 1, 2007; 100(2): 423 - 431.
[Abstract] [Full Text] [PDF]


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Copyright © 1997 by the Botanical Society of America, Inc.