Floral nectar reabsorption and a sugar concentration gradient in two long-spurred Habenaria species (Orchidaceae).
Floral nectar reabsorption and a sugar concentration gradient in two long-spurred Habenaria species (Orchidaceae).
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DOI：
10.1186/s12870-023-04344-2
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发表时间：
2023-06-22
影响因子：
5.3
通讯作者：
Ren, Zong-Xin
中科院分区：
文献类型：
--
作者：
Zhang, Hai-Ping;Wen, Shi-Jia;Wang, Hong;Ren, Zong-Xin
花蜜是花朵提供给传粉者的最常见的奖励。花蜜的质量和数量是了解植物与传粉者相互作用和预测繁殖成功率的关键。然而，花蜜分泌是一个动态过程，生产期伴随或随后是重吸收，而重吸收仍然是一个未充分研究的话题。本研究比较了两种长距兰花玉凤花（Habenaria limprichtii）和玉凤花（H. davidii（兰科）。我们还比较了糖浓度梯度内的马刺和水和糖的重吸收率。这两个物种产生稀释的花蜜糖浓度从17%到24%。花蜜生产动态分析表明，这两个物种的花枯萎几乎所有的糖被重吸收，而原来的水保留在他们的马刺。我们建立了一个花蜜糖浓度梯度为这两个物种，糖浓度的差异，在他们的马刺的终端，并在他们的马刺的入口（窦）。糖浓度梯度水平为1.1%; limprichtii和H. davidii，均随花龄的增加而减少。我们提供的证据表明，糖的重吸收，但不是水发生在两种玉凤花枯萎的花。它们的糖浓度梯度随着花的衰老而消失，这表明糖从位于蜜腺所在的距末端的蜜腺扩散的缓慢过程。花蜜分泌/重吸收的过程，结合稀释和水合作用的糖奖励蛾传粉者值得进一步研究。在线版本包含补充材料，可通过10.1186/s12870-023-04344-2获得。
Floral 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. Both 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. We 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. The online version contains supplementary material available at 10.1186/s12870-023-04344-2.
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三种夜间飞蛾 - 授粉同胞Habenaria物种（Orchidaceae）的生殖隔离。
影响因子：
5.6
作者：
Zhang, Hai-Ping;Tao, Zhi-Bin;Trunschke, Judith;Shrestha, Mani;Scaccabarozzi, Daniela;Wang, Hong;Ren, Zong-Xin
通讯作者：
Ren, Zong-Xin
影响因子：
5.2
作者：
BURQUEZ, A;CORBET, SA
通讯作者：
CORBET, SA
影响因子：
2.2
作者：
CORBET, SA;UNWIN, DM;PRYSJONES, OE
通讯作者：
PRYSJONES, OE
影响因子：
3.9
作者：
Guerra, T. J.;Galetto, L.;Silva, W. R.
通讯作者：
Silva, W. R.
影响因子：
2.1
作者：
Luyt, R;Johnson, SD
通讯作者：
Johnson, SD