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首页> 外文期刊>Botanical Journal of the Linnean Society >Comparative labellar anatomy of resin-secreting and putative resin-mimic species of Maxillaria s.l. (Orchidaceae: Maxillariinae).
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Comparative labellar anatomy of resin-secreting and putative resin-mimic species of Maxillaria s.l. (Orchidaceae: Maxillariinae).

机译：Maxillaria s.l.的树脂分泌和假定的树脂模拟物种的比较小舌解剖。 （兰科：Maxillariinae）。

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摘要

Flowers of most species formerly included in Maxillaria are rewardless. Some, however, reward pollinators with nectar or pseudopollen, whereas the labella of a relatively small number of taxa produce lipoidal floral rewards that include resins and waxes. To date, the labellar secretory tissues of few species have been examined in detail, and some rewardless species having glossy labella are thought to mimic taxa that produce lipoidal rewards. Here, the labellar anatomy of a range of resin-secreting, wax-secreting and putative resin-mimic species is compared using light microscopy, fluorescence microscopy, scanning electron microscopy, transmission electron microscopy and histochemistry, in order to investigate how such secretory tissues may have evolved. Comparisons are also made with other resiniferous and wax-secreting Maxillariinae s.s., and with rewardless control species and the oil-secreting elaiophores of certain Oncidiinae. The labella of all Maxillariinae species investigated displayed similar anatomy, the differences largely being restricted to the adaxial epidermis and subepidermal layer. The labellar secretory epidermis of resiniferous Maxillariella elatior was composed of epithelial palisade cells, whereas that of other resin- and wax-secreting species investigated consisted of secretory papillae or trichomes. Putative resin-mimic species also produced resin, albeit in small quantities, and, here, the epidermal cells were cuboidal or rectangular in section. Secreted material on the labellar surface of control species was probably fragrance residues. Resin was often heterogeneous, and fluorescence microscopy revealed that its composition could change throughout the course of anthesis. Although the resiniferous floral tissues of Maxillariinae s.s. may be epithelial or trichomal, and thus closely resemble the epithelial and trichomal elaiophores of oil-secreting Oncidiinae, they differ in a number of important ways, necessitating the use of more exact descriptive terminology when distinguishing between oil-, resin- and wax-secreting floral structures. Similarity between the resin- or wax-secreting floral structures of Maxillariinae s.s and the oil-secreting elaiophores of Oncidiinae is probably a result of parallelism.
机译：先前包括在Maxillaria中的大多数物种的花是无奖的。但是，有些人用花蜜或假花粉奖励授粉媒介，而相对较少数量的类群的小花蜜会产生脂类花卉奖励，其中包括树脂和蜡。迄今为止，已经详细检查了少数物种的黄斑分泌组织，并且认为一些具有光滑标签的无奖励物种模仿产生类脂奖励的类群。在这里，使用光学显微镜，荧光显微镜，扫描电子显微镜，透射电子显微镜和组织化学比较了一系列树脂分泌，蜡分泌和推定的树脂模拟物种的小腿解剖结构，以研究这种分泌组织如何可能进化。还与其他有树脂的和分泌蜡的Maxillariinae s.s.，无奖励的对照物种以及某些Oncidiinae的分泌油的弹性体进行了比较。所调查的所有上颚科物种的标签显示出相似的解剖结构，差异主要限于表皮的近表皮和表皮下层。树脂化的Maxillariella elatior的标签状分泌表皮由上皮栅栏细胞组成，而其他树脂和蜡分泌物种的分泌性表皮则由分泌性乳头或毛状体组成。假定的类似树脂的物种也产生了树脂，尽管数量很少，并且此处的表皮细胞的截面为长方体或矩形。对照种的黄斑表面上的分泌物质可能是香料残留物。树脂通常是异质的，荧光显微镜显示其组成可能在整个花期过程中发生变化。虽然Maxillariinae s.s的有树脂的花组织。可能是上皮的或Trichomal的，因此与分泌油的Oncidiinae的上皮和Trichomal弹性体非常相似，它们在许多重要方面有所不同，因此在区分油，树脂和蜡的分泌时需要使用更精确的描述性术语花卉结构。 Maxillariinae s.s的分泌树脂或蜡的花香结构与Oncidiinae的分泌油的弹性体之间的相似性可能是平行性的结果。

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