Is pollen removal or seed set favoured by flower longevity in a hummingbird-pollinated Salvia species?

Annals of Botany
Izar Araujo Aximoff, Leandro Freitas

Abstract

The period between the beginning of anthesis and flower senescence modulates the transport of pollen by pollinators among conspecific flowers, and its length may therefore influence reproductive success. This study evaluated whether floral longevity favours pollen removal from the anthers over fecundity (seed set) in an ornithophilous species that does not undergo pollen limitation. Field investigations were conducted on floral longevity, nectar production, pollinator behaviour, and variations in fruit set (FS), mean number of seeds per fruit (MSF) and pollen removal by hummingbirds (PR) during the anthesis of Salvia sellowiana in south-east Brazil. Anthesis of flowers exposed to pollinators lasted 4 d, as well as on flowers with pollen removed from the anthers or deposited on the stigma. The longevity of bagged flowers was significantly higher (approx. 9 d). FS and PR reached 87.2 and 90 %, respectively, in natural conditions. PR increased gradually over the period of anthesis; however, FS and MSF reached their maxima in the first hours of anthesis. Nectar production was continuous, but the secretion rate was reduced after pollination. The removal of nectar from non-pollinated flowers stimulated its production. The longevity o...Continue Reading

References

Jul 17, 2004·Proceedings. Biological Sciences·Steven D JohnsonJon Agren
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Aug 1, 1979·Oecologia·Alan B BoltenIrene Baker

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Citations

Jan 15, 2014·Annals of Botany·Timotheüs Van der NietSteven D Johnson
Oct 21, 2020·Evolution; International Journal of Organic Evolution·Hao WangQing-Jun Li

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