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OUTCROSSING AND FECUNDITY ADVANTAGE OF FEMALES IN GYNODIOECIOUS CHIONOGRAPHIS JAPONICA VAR. KUROHIMENSIS (LILIACEAE)
Author(s) -
Maki Masayuki
Publication year - 1993
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1993.tb15232.x
Subject(s) - gynodioecy , biology , inbreeding depression , selfing , fecundity , seedling , inbreeding , dioecy , japonica , ovule , outcrossing , outbreeding depression , population , botany , pollen , demography , sociology
The selling rate of hermaphrodites, inbreeding depression, and relative fecundity of females compared to hermaphrodites were estimated for a gynodioecious population of Chionographis japonica var. kurohimensis to test the models for the evolution of gynodioecy. In spite of the high level of selling of hermaphrodites, significant amounts of inbreeding depression were found in seed germination and seedling growth. In addition, females produced more fertilized ovules than hermaphrodites. Nevertheless, the conditions theoretically required for maintaining gynodioecy were not satisfied even if the combined effect of these two factors was considered. Additional causes for the evolution of gynodioecy, including biparental inbreeding, are discussed.