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4 results for “floral longevity”
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>
Global analysis of floral longevity reveals latitudinal gradients and biotic and abiotic correlates
<p><span>The length of time a flower remains open and functional – floral longevity – governs important reproductive processes influencing pollination and mating and varies considerably among angiosperm species. However, little is known about large-scale biogeographic patterns and the correlates of floral longevity. </span></p> <p><span>Using published data on floral longevity from 818 angiosperm species in 134 families and 472 locations worldwide, we present the first global quantification of the latitudinal pattern of floral longevity and the relationships between floral longevity and a range of biotic and abiotic factors. </span><span>Floral longevity exhibited a significant phylogenetic signal,</span><span> and</span><span> was longer at higher latitudes in both northern and southern hemispheres, even after accounting for elevation. This latitudinal variation was associated with several biotic and abiotic variables. The mean temperature of the flowering season had the highest predictive power for floral longevity, followed by pollen number per flower. Surprisingly, compatibility status, flower size, pollination mode, and growth form had no significant effects on flower longevity.</span></p> <p><span>Our results suggest that physiological processes associated with floral maintenance play a key role in explaining latitudinal variation in floral longevity across global ecosystems, with potential implications for floral longevity under global climate change and species distributions.</span></p>
Global analysis of floral longevity reveals latitudinal gradients and biotic and abiotic correlates
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Plasticity in floral longevity and sex-phase duration of Lobelia siphilitica in response to simulated pollinator declines
Open the record for dataset details and reuse information.
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