Floral micromorphology of the bird-pollinated carnivorous plant species Utricularia menziesii R.Br. (Lentibulariaceae)

Bartosz Płachno , Małgorzata Stpiczyńska , Piotr Świątek , Hans Lambers , Vitor F. O. Miranda , Francis J. Nge , Piotr Stolarczyk , Gregory R. Cawthray

Abstract

BACKGROUND AND AIMS: Bird pollination is rare among species in the genus Utricularia, and has evolved independently in two lineages of this genus. In Western Australia, the Western Spinebill, Acanthorhynchus superciliosus, visits flowers of Utricularia menziesii (section Pleiochasia: subgenus Polypompholyx). This study aimed to examine the micromorphology of U. menziesii flowers to assess traits that might be linked to its pollination strategy. METHODS: Light microscopy, histochemistry and scanning electron microscopy were used. Nectar sugar composition was analysed using high-performance liquid chromatography. KEY RESULTS: The flowers of U. menziesii fulfil many criteria that characterize bird-pollinated flowers: red colour, a large, tough nectary spur that can withstand contact with a hard beak, lack of visual nectar guides and fragrance. Trichomes at the palate and throat may act as tactile signals. Spur nectary trichomes did not form clearly visible patches, but were more frequently distributed along vascular bundles, and were small and sessile. Each trichome comprised a single basal cell, a unicellular short pedestal cell (barrier cell) and a multicelled head. These trichomes were much smaller than those of the U. vulgaris allies. Hexose-dominated nectar was detected in flower spurs. Fructose and glucose were present in equal quantities (43 ± 3.6 and 42 ± 3.6 g L-1). Sucrose was only detected in one sample, essentially at the limit of detection for the method used. This type of nectar is common in flowers pollinated by passerine perching birds. CONCLUSIONS: The architecture of nectary trichomes in U. menziesii was similar to that of capitate trichomes of insect-pollinated species in this genus; thus, the most important specializations to bird pollination were flower colour (red), and both spur shape and size modification. Bird pollination is probably a recent innovation in the genus Utricularia, subgenus Polypompholyx, and is likely to have evolved from bee-pollinated ancestors.
Author Bartosz Płachno
Bartosz Płachno,,
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, Małgorzata Stpiczyńska
Małgorzata Stpiczyńska,,
-
, Piotr Świątek
Piotr Świątek,,
-
, Hans Lambers
Hans Lambers,,
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, Vitor F. O. Miranda
Vitor F. O. Miranda,,
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, Francis J. Nge
Francis J. Nge,,
-
, Piotr Stolarczyk (FoBaH / IoPBaB / DoBaPP)
Piotr Stolarczyk,,
- Department of Botany and Plant Physiology
, Gregory R. Cawthray
Gregory R. Cawthray,,
-
Journal seriesAnnals of Botany, ISSN 0305-7364, e-ISSN 1095-8290, (N/A 100 pkt)
Issue year2019
Vol123
No1
Pages213-220
Publication size in sheets0.5
Keywords in EnglishAustralian bladderwort, bird pollination, carnivorous plant, floral micro-morphology, HPLC, Lentibulariaceae, nectary structure, nectar composition, ornithophily, sect. Pleiochasia, spur, trichomes
ASJC Classification1110 Plant Science
DOIDOI:10.1093/aob/mcy163
URL https://academic.oup.com/aob/advance-article-abstract/doi/10.1093/aob/mcy163/5087939?redirectedFrom=fulltext
Internal identifierWBIO/2019/5
Languageen angielski
Score (nominal)100
Score sourcejournalList
Publication indicators WoS Citations = 2; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.697; WoS Impact Factor: 2018 = 3.454 (2) - 2018=4.506 (5)
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