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- W3185958513 abstract "Summary Current models of floral nectar production do not include a contribution from photosynthesis by green nectary tissue, even though many species have green nectaries. Mānuka ( Leptospermum scoparium ) floral nectaries are green, and in addition to sugars, their nectar contains dihydroxyacetone (DHA), the precursor of the antimicrobial agent in the honey. We investigated causes of variation in mānuka floral nectar production, particularly the effect of light incident on the nectary. Flower gas exchange, chlorophyll fluorescence, and the effects on nectar of age, temperature, light, sucrose, 3‐(3,4‐dichlorophenyl)‐1,1‐dimethylurea (DCMU), pyridoxal phosphate, and 13 CO 2 , were measured for attached and excised flowers. Flower age affected all nectar traits, whilst temperature affected total nectar sugar only. Increased light reduced floral CO 2 efflux, increased nectar sugar production, and affected the ratio of DHA to other nectar sugars. DCMU, an inhibitor of photosystem II, reduced nectar sugar production. Pyridoxal phosphate, an inhibitor of the chloroplast envelope triose phosphate transporter, reduced nectar DHA content. Incubation of excised flowers with 13 CO 2 in the light resulted in enrichment of nectar sugars, including DHA. Photosynthesis within green nectaries contributes to nectar sugars and influences nectar composition. Mānuka nectar DHA arises from pools of triose phosphate that are modulated by nectary photosynthesis." @default.
- W3185958513 created "2021-08-02" @default.
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- W3185958513 date "2021-08-24" @default.
- W3185958513 modified "2023-10-11" @default.
- W3185958513 title "Nectary photosynthesis contributes to the production of mānuka (<i>Leptospermum scoparium</i>) floral nectar" @default.
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- W3185958513 doi "https://doi.org/10.1111/nph.17632" @default.
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