Die wasserlöslichen Vitamine des Nektars

Ziegler, H.; Lüttge, U.; Lüttge, Ulrich

doi:10.1016/s0367-1615(17)32674-5

Cited by 4 publications

(7 citation statements)

References 24 publications

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“…Vitamins, including riboflavin, have been previously identified in nectars (Ziegler et al ., 1964; Lüttge, 1966; Carter & Thornburg, 2004a), but information on their biological functions in plant–pollinator interactions is lacking. We tested three non‐mutually exclusive hypotheses for riboflavin function in nectar, including: as an antimicrobial agent when exposed to light; as a visual cue to potential pollinators; and as a reward to potential pollinators. …”

Section: Resultsmentioning

confidence: 99%

“…Still, nectar riboflavin concentrations from both species measured at least c . 10‐ to 100‐fold higher than any previously reported levels of riboflavin in the nectars of other species (Ziegler et al ., 1964; Lüttge, 1966; Table S1). Additionally, none of the nectars previously reported to contain riboflavin was reported to have a yellow color (Ziegler et al ., 1964; Lüttge, 1966).…”

Section: Resultsmentioning

confidence: 99%

“…500 μM), especially when compared to other nectars known to contain riboflavin (Ziegler et al ., 1964; Lüttge, 1966; Table S1). Vitamins have been reported in nectars before (Ziegler et al ., 1964; Lüttge, 1966; Carter & Thornburg, 2004a), but their biological functions have not been experimentally addressed. Our data could not reject any of our three hypotheses for a role of riboflavin in nectar.…”

Section: Discussionmentioning

confidence: 99%

“…Some specialized metabolites found in nectars can serve more than one functional role, as is the case with the dark nectar of Aloe vryheidensis , which both attracts bird pollinators while simultaneously deterring unwanted nectarivores (Johnson et al ., 2006; Gonzalez‐Teuber & Heil, 2009). Essential vitamins also accumulate in some nectars (Supporting Information Table S1; Griebel & Hess, 1940; Ziegler et al ., 1964; Lüttge, 1966; Baker & Baker, 1975) but their biological roles have not been functionally assessed.…”

Section: Introductionmentioning

confidence: 99%

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A multifunctional role for riboflavin in the yellow nectar of Capsicum baccatum and Capsicum pubescens

Magner,

Freund Saxhaug,

Zambre

et al. 2024

New Phytologist

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Summary A few Capsicum (pepper) species produce yellow‐colored floral nectar, but the chemical identity and biological function of the yellow pigment are unknown. A combination of analytical biochemistry techniques was used to identify the pigment that gives Capsicum baccatum and Capsicum pubescens nectars their yellow color. Microbial growth assays, visual modeling, and honey bee preference tests for artificial nectars containing riboflavin were used to assess potential biological roles for the nectar pigment. High concentrations of riboflavin (vitamin B2) give the nectars their intense yellow color. Nectars containing riboflavin generate reactive oxygen species when exposed to light and reduce microbial growth. Visual modeling also indicates that the yellow color is highly conspicuous to bees within the context of the flower. Lastly, field experiments demonstrate that honey bees prefer artificial nectars containing riboflavin. Some Capsicum nectars contain a yellow‐colored vitamin that appears to play roles in (1) limiting microbial growth, (2) the visual attraction of bees, and (3) as a reward to nectar‐feeding flower visitors (potential pollinators), which is especially interesting since riboflavin is an essential nutrient for brood rearing in insects. These results cumulatively suggest that the riboflavin found in some Capsicum nectars has several functions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A multifunctional role for riboflavin in the yellow nectar of Capsicum baccatum and Capsicum pubescens

Magner,

Freund Saxhaug,

Zambre

et al. 2024

New Phytologist

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“…Nectar is a poor source of nutrition because it contains only carbohydrates, micronutrients and occasionally some free amino acids (Ziegler et al . , Hiebert & Calder ). Bats that ate nectar supplemented their diets with fruit and insects ( e.g ., Rex et al .…”

Section: Discussionmentioning

confidence: 96%

Morphology, Diet and Flower‐visiting by Phyllostomid Bats in Cuba

2014

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Pollinator morphology can play an important role in structuring plant-pollinator relationships and a pollinator's morphology may be associated with aspects of its diet. We examined the relationship between morphology and the partitioning of flower-based food resources for five species of flower-visiting Cuban bats: Artibeus jamaicensis, Brachyphylla nana, Erophylla sezekorni, Monophyllus redmani and Phyllonycteris poeyi. We analyzed cranial traits and body size to assess differences among species with respect to morphological specializations. We also collected dietary data from guano and used acoustic monitoring to assess bat activity at flowers. We found evidence that bats partition floral resources, but we found no direct evidence that plants were limiting resources for the bats. Morphological similarity among bat species did not predict dietary overlap. Rather it was associated with phylogenic relationships among some species. Species with different morphological specialization for flower-visiting consumed resources and visited food plants at different frequencies.Abstract in Spanish is available in the online version of this article.

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Sugar occurring in the extrafloral exudates of the orchidaceae

Baskin

Bliss

1969

Phytochemistry

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Die wasserlöslichen Vitamine des Nektars

Cited by 4 publications

References 24 publications

A multifunctional role for riboflavin in the yellow nectar of Capsicum baccatum and Capsicum pubescens

A multifunctional role for riboflavin in the yellow nectar of Capsicum baccatum and Capsicum pubescens

Morphology, Diet and Flower‐visiting by Phyllostomid Bats in Cuba

Sugar occurring in the extrafloral exudates of the orchidaceae

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