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30 results for “Lobelia siphilitica”
Lobelia siphilitica (Campanulaceae) - inflorescence - whole - unspecified
Image of Lobelia siphilitica (Campanulaceae) - inflorescence - whole - unspecified
Lobelia siphilitica (Campanulaceae) - leaf - basal or on lower stem
Image of Lobelia siphilitica (Campanulaceae) - leaf - basal or on lower stem
Plasticity in floral longevity and sex-phase duration of Lobelia siphilitica in response to simulated pollinator declines
<p><strong>Premise: </strong>Pollinator declines can reduce the quantity and quality of pollination services, resulting in less pollen deposited on flowers and lower seed production by plants. In response to these reductions, plants can increase the opportunity for pollination by plastically adjusting their floral traits, including floral longevity and sex-phase duration. However, studies of plant responses to pollinator declines have primarily focused on floral evolution across generations rather than plasticity in floral traits within a generation.</p> <p><strong>Methods:</strong> To test whether plants can respond to pollinator declines by plastically adjusting their floral traits, we simulated declines by experimentally reducing pollinator access to Lobelia siphilitica plants, and measuring floral longevity and male- and female-phase duration. We also measured daily display size and phenotypic gender to test whether plasticity in floral longevity and sex-phase duration affected inflorescence traits.</p> <p><strong>Results:</strong> We found that experimentally reducing pollination extended the male-phase duration of early-season flowers and the longevity of late-season flowers. However, plants with an extended male phase did not have a more male-biased phenotypic gender, and plants with an extended floral longevity did not have a larger daily display.</p> <p><strong>Conclusions:</strong> Our results suggest that L . siphilitica plants can respond to pollinator declines by plastically adjusting both the longevity and sex-phase duration of their flowers. Consequently, plasticity in floral traits could be one mechanism by which plants respond to decreases in pollination services caused by pollinator declines.</p>
Data from: Do genetic drift and gene flow affect the geographic distribution of female plants in gynodioecious Lobelia siphilitica?
<p>Variation in population sex ratio is particularly pronounced in gynodioecious angiosperms. Extremely high female frequencies in gynodioecious populations cannot be readily explained by selective forces alone. To assess the contributions of drift and gene flow to extreme sex-ratio variation, we documented sex ratio and population size in 92 populations of <em>Lobelia siphilitica</em> across its range and genotyped plants using plastid and nuclear genetic markers. Similarity in spatial patterns of genetic and demographic variables may suggest that drift and/or gene flow have contributed to population sex-ratio variation in <em>L. siphilitica</em>. We found strong spatial structuring of extremely high female frequencies: populations with >50% female plants are restricted to the south–central portion of the range. However, we did not detect any spatial structuring in population size nor metrics of genetic diversity, suggesting that extreme variation in female frequency is not strongly affected by drift or gene flow. Extreme sex-ratio variation is frequently observed in gynodioecious plants, but its causes are difficult to identify. Further investigation into mechanisms that create or maintain spatial structure of sex ratios in gynodioecious species will provide much needed insight.</p>
Data from: Frequency-dependent fitness in gynodioecious Lobelia siphilitica
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Plasticity in floral longevity and sex-phase duration of Lobelia siphilitica in response to simulated pollinator declines
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Data from: Lobelia siphilitica plants that escape herbivory in time also have reduced latex production
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Data from: Beyond balancing selection: frequent mitochondrial recombination contributes to high female frequencies in gynodioecious Lobelia siphilitica L. (Campanulaceae)
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Data from: Do genetic drift and gene flow affect the geographic distribution of female plants in gynodioecious Lobelia siphilitica?
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Lobelia siphilitica (Campanulaceae) - inflorescence - whole - unspecified
Image of Lobelia siphilitica (Campanulaceae) - inflorescence - whole - unspecified
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