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首页> 外文期刊>Plant biology >Floral nectar production and nectary structure of a bee-pollinated shrub from Neotropical savanna
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Floral nectar production and nectary structure of a bee-pollinated shrub from Neotropical savanna

机译：新热带稀树草原蜜蜂授粉灌木的花蜜生产与蜜腺结构

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摘要

Biotic pollination is critical for tropical ecosystem functioning, and nectar plays an essential role as it represents the main trophic resource for pollinators. Nevertheless, little is known about the mechanisms that underlie its production, which is essential for understanding the basis of nectar-mediated interactions in ecological and evolutionary approaches. Therefore, this study explores the relationship between the nectar secretion pattern and nectary functional changes in Anemopaegma album, a bee-pollinated species. We analysed the pattern of nectar production under field conditions and investigated floral nectary structural changes in two different developmental stages using light, transmission and scanning electron microscopy. We measured 30.95 +/- 23.02 mu l (mean +/- SD, n = 30) of nectar accumulated inside the nectar chamber (29.26 +/- 3.48% sucrose equivalents) at the moment of flower opening. Nectar removal did not influence the pattern of floral nectar production in terms of volume or total sugar but reduced the concentration of the nectar produced during the first 24 h of anthesis. The nectary consisted of an epidermis, a nectary parenchyma and a subnectary parenchyma supplied only by phloem. Starch grains decreased in size and abundance from the subnectary parenchyma toward the epidermis. We observed the degradation of starch grains and incorporation of amyloplasts into vacuoles at the pre-anthesis stage as well as the transformation of amyloplasts into elaioplasts during anthesis. Nectar secretion was continuous during the A. album flower life span, which was related to the functional features of its floral nectary, especially the presence of starch stored in the parenchyma.
机译：生物授粉对于热带生态系统的功能至关重要，而花蜜起着至关重要的作用，因为它代表了传粉媒介的主要营养资源。然而，关于其产生基础的机制知之甚少，这对于理解生态和进化方法中花蜜介导的相互作用的基础至关重要。因此，本研究探讨了蜜蜂传粉物种Anemopaegma album的花蜜分泌模式与蜜腺功能变化之间的关系。我们分析了田间条件下的花蜜生产模式，并利用光，透射和扫描电子显微镜研究了两个不同发育阶段的花蜜结构变化。在开花时，我们测量了在花蜜室内（29.26 +/- 3.48％蔗糖当量）内积累的30.95 +/- 23.02微升（平均+/- SD，n = 30）的花蜜。花蜜的去除并不影响花蜜的产量或总糖含量，但降低了花期前24 h所产生的花蜜浓度。蜜腺由表皮，蜜腺实质和仅由韧皮部提供的蜜腺实质组成。淀粉粒的大小和丰度从皮下薄壁组织向表皮减小。我们观察到在开花前阶段淀粉粒的降解和淀粉状体掺入液泡中，以及在开花期淀粉状体转化为弹性体。在A.专辑花的整个生命周期中，花蜜的分泌是连续的，这与其花蜜的功能有关，特别是薄壁组织中存在淀粉。

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