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dc.contributor.authorClearwater, Michael J.en_NZ
dc.contributor.authorRevell, Mariaen_NZ
dc.contributor.authorNoe, Stevieen_NZ
dc.contributor.authorManley-Harris, Merilynen_NZ
dc.date.accessioned2018-05-09T23:24:44Z
dc.date.available2018-02-01en_NZ
dc.date.available2018-05-09T23:24:44Z
dc.date.issued2018en_NZ
dc.identifier.citationClearwater, M. J., Revell, M., Noe, S., & Manley-Harris, M. (2018). Influence of genotype, floral stage, and water stress on floral nectar yield and composition of mānuka (Leptospermum scoparium). Annals of Botany, 121(3), 501–512. https://doi.org/10.1093/aob/mcx183en
dc.identifier.issn0305-7364en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/11818
dc.description.abstract• Background and Aims Floral nectar can be variable in composition, influencing pollinator behaviour and the composition of honey derived from it. The non-peroxide antibacterial activity of mānuka (Leptospermum scoparium, Myrtaceae) honey results from the chemical conversion of the triose sugar dihydroxyacetone (DHA), after DHA accumulates for an unknown reason in the nectar. This study examined variation in nectar DHA, glucose, fructose and sucrose content with floral stage of development, between mānuka genotypes with differing flower morphology, and in response to water stress. • Methods Six mānuka genotypes were grown without nectar-feeding insects. Stages of flower development were defined, nectar was harvested and its composition was compared between stages and genotypes, and with floral morphology. Water stress was imposed and its effect on nectar composition was examined. • Key Results Nectar was present from soon after flower opening until the end of petal abscission, with the quantity of accumulated nectar sugars rising, then stabilizing or falling, indicating nectar secretion followed by reabsorption in some genotypes. The quantity of DHA, the ratio of DHA to other nectar sugars and the fructose to glucose ratio also varied with stage of development, indicating differences in rates of production and reabsorption between nectar components. Nectar composition and yield per flower also differed between genotypes, although neither was positively related to nectary area or stomatal density. Drying soil had no effect on nectar composition or yield, but variation in nectar yield was correlated with temperature prior to nectar sampling. • Conclusions Mānuka nectar yield and composition are strongly influenced by plant genotype, flower age and the environment. There were clear stoichiometric relationships between glucose, fructose and sucrose per flower, but DHA per flower was only weakly correlated with the amount of other sugars, suggesting that accumulation of the triose sugar is indirectly coupled to secretion of the larger sugars by the nectary parenchyma.
dc.format.mimetypeapplication/pdf
dc.language.isoenen_NZ
dc.publisherOxford University Pressen_NZ
dc.rights© The Author(s) 2018. Published by Oxford University Press on behalf of the Annals of Botany Company. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.subjectScience & Technologyen_NZ
dc.subjectLife Sciences & Biomedicineen_NZ
dc.subjectPlant Sciencesen_NZ
dc.subjectNectaren_NZ
dc.subjectm(a)over-barnukaen_NZ
dc.subjectgenotypeen_NZ
dc.subjectenvironmenten_NZ
dc.subjectLeptospermum scopariumen_NZ
dc.subjectdihydroxyacetoneen_NZ
dc.subjectwater stressen_NZ
dc.subjecthoneyen_NZ
dc.subjectcompositionen_NZ
dc.subjectfloral stageen_NZ
dc.subjectFT-RAMAN SPECTROSCOPYen_NZ
dc.subjectNew Zealanden_NZ
dc.subjectBRASSICA-NAPUSen_NZ
dc.subjectManukaen_NZ
dc.subjectDIHYDROXYACETONEen_NZ
dc.subjectMYRTACEAEen_NZ
dc.subjectFLOWERSen_NZ
dc.subjectSECRETIONen_NZ
dc.subjectHONEYen_NZ
dc.subjectMETHYLGLYOXALen_NZ
dc.titleInfluence of genotype, floral stage, and water stress on floral nectar yield and composition of mānuka (Leptospermum scoparium)en_NZ
dc.typeJournal Article
dc.identifier.doi10.1093/aob/mcx183en_NZ
dc.relation.isPartOfAnnals of Botanyen_NZ
pubs.begin-page501
pubs.elements-id220831
pubs.end-page512
pubs.issue3en_NZ
pubs.publication-statusPublisheden_NZ
pubs.volume121en_NZ
dc.identifier.eissn1095-8290en_NZ


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