Sugar and dihydroxyacetone ratios in floral nectar suggest continuous exudation and reabsorption in Leptospermum polygalifolium Salisb

Sylvester A Obeng-Darko; Peter Brooks; Erik J Veneklaas; Patrick M Finnegan

doi:10.1016/j.plantsci.2022.111378

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Sugar and dihydroxyacetone ratios in floral nectar suggest continuous exudation and reabsorption in Leptospermum polygalifolium Salisb

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Peer reviewed

Sugar and dihydroxyacetone ratios in floral nectar suggest continuous exudation and reabsorption in Leptospermum polygalifolium Salisb

Sylvester A Obeng-Darko, Peter Brooks, Erik J Veneklaas and Patrick M Finnegan

Plant Science, Vol.323, pp.1-11

2022

DOI: https://doi.org/10.1016/j.plantsci.2022.111378

PMID: 35842059

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Abstract

dihydroxyacetone

Tsugar

exudation

accumulation

reabsorption

nectar

flower age

Leptospermum polygalifolium

Leptospermum polygalifolium Salisb. can accumulate high concentrations of dihydroxyacetone (DHA), precursor of the antimicrobial compound methylglyoxal found in honey obtained from floral nectar of Leptospermum spp. Floral nectar dynamics over flower lifespan depends on internal and external factors that invariably impact nectar quality. Current models to estimate nectar quality in Leptospermum spp. overlook time of day, daily (24 h), and long-term dynamics of nectar exudation and accumulation over flower lifespan. To explain the dynamics of nectar quality over flower lifespan, accumulated nectar from flowers of different ages was collected from two L. polygalifolium clones, and then re-collected 24 h later from the same flowers. High-Performance Liquid Chromatography was used to quantify DHA amount and total equivalents of glucose + fructose (Tsugar) per flower in the nectar. DHA and Tsugar amount per flower differed with flower age and between clones. In accumulated nectar, the amount of DHA and Tsugar per flower rose to a broad peak post-anthesis before decreasing. Immediately after peaking DHA declined more quickly than Tsugar in accumulated nectar due to a greater decrease in the exudation for DHA than for Tsugar. The DHA: Tsugar ratios in accumulated nectar and in nectar exuded over the next 24 h were similar and decreased with flower age, indicating that exudation and reabsorption occurred concomitantly across flower development. Hence there is a balance between exudation and reabsorption. A quantitative model suggested that flowers have the potential to exude more DHA and Tsugar than actually accumulated.

Details

Title: Sugar and dihydroxyacetone ratios in floral nectar suggest continuous exudation and reabsorption in Leptospermum polygalifolium Salisb
Authors: Sylvester A Obeng-Darko (Author) - The University of Western Australia
Peter Brooks (Author) - University of the Sunshine Coast, Queensland, School of Science, Technology and Engineering
Erik J Veneklaas (Author) - The University of Western Australia
Patrick M Finnegan (Author) - The University of Western Australia
Publication details: Plant Science, Vol.323, pp.1-11
Publisher: Elsevier Ireland Ltd.
Date published: 2022
DOI: 10.1016/j.plantsci.2022.111378
ISSN: 1873-2259
PMID: 35842059
Organisation Unit: University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering; Centre for Bioinnovation
Language: English
Record Identifier: 99656498802621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Biochemistry & Molecular Biology; Plant Sciences

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