Associations between sex-organ deployment and morph bias in related heterostylous taxa with different stylar polymorphisms.
@article{Ferrero2017AssociationsBS, title={Associations between sex-organ deployment and morph bias in related heterostylous taxa with different stylar polymorphisms.}, author={Victoria Ferrero and Spencer C. H. Barrett and Danny Rojas and Juan Arroyo and Luis Navarro}, journal={American journal of botany}, year={2017}, volume={104 1}, pages={ 50-61 } }
PREMISE OF THE STUDY
Populations of heterostylous species are characterized by two or three floral morphs with reciprocal positioning of stigmas and anthers. Theoretical models predict equal morph frequencies (isoplethy) when disassortative mating is prevalent in populations, but biased morph ratios may occur when variation in the expression of heterostyly causes deviations from intermorph mating.
METHODS
We explore the role of sex-organ deployment in governing morph ratios in two closely…
12 Citations
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The presence of stigmaheight dimorphism and estimated morph ratios in four naturally occurring populations of Jasminum malabaricum are investigated, highlighting the importance of sufficient effective pollinators and floral morphological features, particularly herkogamy, in maintaining isoplethy in species with stigma-heightDimorphism.
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Variations among stamens and styles are widespread in angiosperms. In both heteranthery and heterostyly, variation in styles and stamens is considered an outcome of selective forces driven mainly by…
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Herkogamy was more important than reciprocity in increasing legitimate pollen transfer and reproductive success in J. malabaricum, and this may allow the evolution of reciprocal arrangement of sex organs at a later stage in the pathway towards distyly.
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This study is the first to quantify and report natural inter- morph stigmatic pollen load in a species with stigma-height dimorphism, highlighting the importance of both herkogamy and reciprocity in facilitating inter-morph pollen transfer.
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