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Title
Nectar Replaced by Volatile Secretion : A Potential New Role for Nectarless Flowers in a Bee-Pollinated Plant Species
AuthorGuimarães, Elza ; Tunes, Priscila ; de Almeida Junior, Luiz D. de ; Stasi, Luiz C. ; Dötterl, Stefan ; Machado, Silvia R.
Published in
Frontiers in Plant Science, Lausanne, 2018, Vol. 9, Issue article number 1243, page 1-23
PublishedLausanne : Frontiers, 2018
LanguageEnglish
Document typeJournal Article
Keywords (EN)nectar secretion / nectariferous and nectarless flowers / nectary anatomy and ultrastructure / plantpollinator interactions / volatile compound secretion
ISSN1664-462X
URNurn:nbn:at:at-ubs:3-10190 Persistent Identifier (URN)
DOI10.3389/fpls.2018.01243 
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 The work is publicly available
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Abstract (English)

The presence of nectarless flowers in nectariferous plants is a widespread phenomenon in angiosperms. However, the frequency and distribution of nectarless flowers in natural populations, and the transition from nectariferous to nectarless flowers are poorly known. Variation in nectar production may affect mutualism stability, since energetic resource availability influences pollinators foraging behavior. Here, we described the spatial and temporal nectar production patterns of Jacaranda oxyphylla, a bee-pollinated species that naturally presents nectarless flowers. Additionally, we compared nectariferous and nectarless floral disks in order to identify histological, subcellular and chemical changes that accompanied the loss of nectar production ability. For that we used standard methods for light and transmission electron microscopy, and gas chromatography coupled to mass spectrometry for chemical analyses. We verified that 47% of flowers did not produce nectar during the whole flower lifespan (nectarless flowers). We also observed remarkable inter-plant variation, with individuals having only nectarless flowers, others only nectariferous ones and most of them showing different proportions of both flower types, with variable nectar volumes (321 l). Additionally, among nectariferous flowers, we registered two distinct rhythms of nectar production. ‘Early flowers produced nectar from

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CC-BY-License (4.0)Creative Commons Attribution 4.0 International License