Gynodioecy inGingidia flabellata(Umbelliferae)
نویسندگان
چکیده
منابع مشابه
Merging theory and mechanism in studies of gynodioecy.
In gynodioecious species, females and hermaphrodites coexist and the genetics of sex determination is usually nuclear cytoplasmic. Maintaining nuclear-cytoplasmic gynodioecy requires polymorphism for the feminizing genes (contained in the mitochondria) and the genes that restore male fertility (contained in the nucleus). This complex polymorphism depends, in part, on there being negative pleiot...
متن کاملSelection with Gene-Cytoplasm Interactions. II. Maintenance of Gynodioecy.
Gynodioecy is apparently frequently inherited through gene-cytoplasm interactions. General conditions for the protectedness of gene-cytoplasm polymorphisms for a biallelic model with two cytoplasm types were obtained previously, and these are applied to seven special cases of gene-cytoplasm interactions controlling gynodioecy and involving dominance. It is assumed that nuclear polymorphisms can...
متن کاملThe effect of pollen versus seed flow on the maintenance of nuclear-cytoplasmic gynodioecy.
Gynodioecy, where females co-occur with hermaphrodites, is a relatively common sexual system in plants that is often the result of a genetic conflict between maternally inherited male sterility genes in the mitochondrial genome and the biparentally inherited male fertility restorer genes in the nucleus. Previous models have shown that nuclear-cytoplasmic gynodioecy can be maintained under certa...
متن کاملGynodioecy in structured populations: understanding fine-scale sex ratio variation in Beta vulgaris ssp. maritima.
Natural selection, random processes and gene flow are known to generate sex ratio variations among sexually polymorphic plant populations. In gynodioecious species, in which hermaphrodites and females coexist, the relative effect of these processes on the maintenance of sex polymorphism is still up for debate. The aim of this study was to document sex ratio and cytonuclear genetic variation at ...
متن کاملSex allocation in an hermaphroditic plant: the case of gynodioecy in Thymus uuigaris L
Resource allocation to male and female functions was investigated in Thymus vulgaris L. (thyme), a gynodioecious species, in which females produce twice as many seeds as hermaphrodites. Negative correlations were found between male and female fertility of hermaphrodites, providing evidence of a trade-off. There was a high variability in sexual investment, some of the hermaphrodites functioning ...
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ژورنال
عنوان ژورنال: New Zealand Journal of Botany
سال: 1981
ISSN: 0028-825X,1175-8643
DOI: 10.1080/0028825x.1981.10425194