Floral nectar reabsorption and a sugar concentration gradient in two long-spurred Habenaria species (Orchidaceae)

doi:10.1186/s12870-023-04344-2

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	Floral nectar reabsorption and a sugar concentration gradient in two long-spurred Habenaria species (Orchidaceae)
	Zhang,Hai-Ping; Wen,Shi-Jia; Wang,Hong; Ren,Zong-Xin
	2023
发表期刊	BMC PLANT BIOLOGY
卷号	23 期号:1 页码:331
摘要	BackgroundFloral nectar is the most common reward flowers offered to pollinators. The quality and quantity of nectar produced by a plant species provide a key to understanding its interactions with pollinators and predicting rates of reproductive success. However, nectar secretion is a dynamic process with a production period accompanied or followed by reabsorption and reabsorption remains an understudied topic. In this study, we compared nectar volume and sugar concentration in the flowers of two long-spurred orchid species, Habenaria limprichtii and H. davidii (Orchidaceae). We also compared sugar concentration gradients within their spurs and rates of reabsorption of water and sugars.ResultsBoth species produced diluted nectar with sugar concentrations from 17 to 24%. Analyses of nectar production dynamics showed that as flowers of both species wilted almost all sugar was reabsorbed while the original water was retained in their spurs. We established a nectar sugar concentration gradient for both species, with differences in sugar concentrations at their spur's terminus and at their spur's entrance (sinus). Sugar concentration gradient levels were 1.1% in H. limprichtii and 2.8% in H. davidii, both decreasing as flowers aged.ConclusionWe provided evidence for the reabsorption of sugars but not water occurred in wilted flowers of both Habenaria species. Their sugar concentration gradients vanished as flowers aged suggesting a slow process of sugar diffusion from the nectary at the spur's terminus where the nectar gland is located. The processes of nectar secretion/reabsorption in conjunction with the dilution and hydration of sugar rewards for moth pollinators warrant further study.
关键词	Nectar production Nectar volume and concentration Nectar reabsorption Floral rewards Flower age CUSTER RCHB. ORCHIDACEAE POLLINATION SECRETION RESORPTION PLANT HAWKMOTH FLOWERS ULTRASTRUCTURE TRAITS VISITS
DOI	10.1186/s12870-023-04344-2
WOS记录号	WOS:001017557600003
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74945
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Zhang,Hai-Ping,Wen,Shi-Jia,Wang,Hong,et al. Floral nectar reabsorption and a sugar concentration gradient in two long-spurred Habenaria species (Orchidaceae)[J]. BMC PLANT BIOLOGY,2023,23(1):331.
APA	Zhang,Hai-Ping,Wen,Shi-Jia,Wang,Hong,&Ren,Zong-Xin.(2023).Floral nectar reabsorption and a sugar concentration gradient in two long-spurred Habenaria species (Orchidaceae).BMC PLANT BIOLOGY,23(1),331.
MLA	Zhang,Hai-Ping,et al."Floral nectar reabsorption and a sugar concentration gradient in two long-spurred Habenaria species (Orchidaceae)".BMC PLANT BIOLOGY 23.1(2023):331.

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