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30 results for “Lobelia siphilitica”
Lobelia siphilitica (Campanulaceae) - inflorescence - frontal view of flower
Image of Lobelia siphilitica (Campanulaceae) - inflorescence - frontal view of flower
Lobelia siphilitica (Campanulaceae) - stem - showing leaf bases
Image of Lobelia siphilitica (Campanulaceae) - stem - showing leaf bases
Lobelia siphilitica (Campanulaceae) - whole plant - in flower - general view
Image of Lobelia siphilitica (Campanulaceae) - whole plant - in flower - general view
Lobelia siphilitica (Campanulaceae) - leaf - margin of upper + lower surface
Image of Lobelia siphilitica (Campanulaceae) - leaf - margin of upper + lower surface
Lobelia siphilitica (Campanulaceae) - leaf - basal or on lower stem
Image of Lobelia siphilitica (Campanulaceae) - leaf - basal or on lower stem
Lobelia siphilitica (Campanulaceae) - inflorescence - lateral view of flower
Image of Lobelia siphilitica (Campanulaceae) - inflorescence - lateral view of flower
Simulated pollinator decline has similar effects on seed production of female and hermaphrodite Lobelia siphilitica, but different effects on selection on floral traits
<p><span>PREMISE:</span><span> Pollinator decline, by reducing seed production, is predicted to strengthen natural selection on floral traits. However, the effect of pollinator decline on gender dimorphic species (such as gynodioecious species, where plants produce female or hermaphrodite flowers) may differ between the sex morphs: if pollinator decline reduces the seed production of females more than hermaphrodites, then it should also have a larger effect on selection on floral traits in females than in hermaphrodites.</span></p> <p><span>RESULTS: </span><span>Experimentally reducing pollination decreased seed production of both females and hermaphrodites by ~21%. Reducing pollination also strengthened selection on floral traits, but this effect was not larger in females than in hermaphrodites. Instead, reducing pollination intensified selection for taller inflorescences in hermaphrodites, but did not intensify selection on any floral trait in females.</span></p> <p><span>CONCLUSIONS:</span><span> Our results suggest that pollinator decline will not have a larger effect on either seed production or selection on floral traits of female plants. As such, any effect of pollinator decline on seed production may be similar for gender dimorphic and monomorphic species. However, the potential for floral traits of females (and thus of gender dimorphic species) to evolve in response to pollinator decline could be limited.</span></p>
Simulated pollinator decline has similar effects on seed production of female and hermaphrodite Lobelia siphilitica, but different effects on selection on floral traits
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Data from: Physiological effects of temperature do not explain prevalence of females in populations of gynodioecious Lobelia siphilitica growing in warmer climates
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Data from: Beyond balancing selection: frequent mitochondrial recombination contributes to high female frequencies in gynodioecious Lobelia siphilitica L. (Campanulaceae)
(1) Gynodioecy is a sexual system where females and hermaphrodites co-occur. In most gynodioecious angiosperms, sex is determined by an interaction between mitochondrial male-sterility genes (CMS) that arise via recombination and nuclear restorer alleles that evolve to suppress them. In theory, gynodioecy occurs when multiple CMS types are maintained at equilibrium frequencies by balancing selection. However, some gynodioecious populations contain very high frequencies of females. High female frequencies are not expected under balancing selection, but could be explained by the repeated introduction of novel CMS types. (2) To test for balancing selection and/or the repeated introduction of novel CMS, we characterized cytoplasmic haplotypes from 61 populations of Lobelia siphilitica that vary widely in female frequency. (3) We confirmed that mitotype diversity and female frequency were positively correlated across populations, consistent with balancing selection. However, while low-female populations hosted mostly common mitotypes, high-female populations and female plants hosted mostly rare, recombinant mitotypes likely to carry novel CMS types. (4) Our results suggest that balancing selection maintains established CMS types across this species, but extreme female frequencies result from frequent invasion by novel CMS types. We conclude that balancing selection alone cannot account for extreme population sex-ratio variation within a gynodioecious species.
Lobelia siphilitica (Campanulaceae) - leaf - on upper stem
Image of Lobelia siphilitica (Campanulaceae) - leaf - on upper stem
Lobelia siphilitica (Campanulaceae) - leaf - margin of upper + lower surface
Image of Lobelia siphilitica (Campanulaceae) - leaf - margin of upper + lower surface
Lobelia siphilitica (Campanulaceae) - inflorescence - whole - unspecified
Image of Lobelia siphilitica (Campanulaceae) - inflorescence - whole - unspecified
Lobelia siphilitica (Campanulaceae) - inflorescence - lateral view of flower
Image of Lobelia siphilitica (Campanulaceae) - inflorescence - lateral view of flower
Lobelia siphilitica (Campanulaceae) - inflorescence - whole - unspecified
Image of Lobelia siphilitica (Campanulaceae) - inflorescence - whole - unspecified
Lobelia siphilitica (Campanulaceae) - whole plant - unspecified
Image of Lobelia siphilitica (Campanulaceae) - whole plant - unspecified
Lobelia siphilitica (Campanulaceae) - whole plant - in flower - general view
Image of Lobelia siphilitica (Campanulaceae) - whole plant - in flower - general view
Lobelia siphilitica (Campanulaceae) - stem - showing leaf bases
Image of Lobelia siphilitica (Campanulaceae) - stem - showing leaf bases
Lobelia siphilitica (Campanulaceae) - inflorescence - frontal view of flower
Image of Lobelia siphilitica (Campanulaceae) - inflorescence - frontal view of flower
Lobelia siphilitica (Campanulaceae) - inflorescence - lateral view of flower
Image of Lobelia siphilitica (Campanulaceae) - inflorescence - lateral view of flower
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