Structural and histochemical characterization of the osmophores in corollas of Asteraceae (tribes Onoserideae and Famatinantheae)

IF 0.7 4区生物学 Q4 PLANT SCIENCES

Adansonia Pub Date : 2020-09-14 DOI:10.5252/adansonia2020v42a12

L. Katinas, Marcelo P. Hernández, G. Sancho

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引用次数: 1

Abstract

ABSTRACT Osmophores are engaged in scent production and differ from other secretory structures by their product, site, duration, and anatomical structure. Whereas osmophores have been well-documented in flowers of several families, they are barely mentioned in the Asteraceae. The aims of this study are to: 1) determine the occurrence of osmophores in corollas of 39 species of the tribe Onoserideae and the only species of Famatinantheae with histochemical methods; and 2) analyze the morphology and structure of osmophores in these groups. Histochemical and histological techniques revealed osmophores in the marginal and in the central corollas of Famatinanthus Ariza & S.E. Freire and Plazia Ruiz & Pav. at the apex and margin of the corolla lobes, and at the sinuses. Osmophores were confirmed following positive staining reactions for TIOFH and TIOFH3 (Neutral Red, Oil Red O, and Iodine-Potassium-Iodide); the samples reacted negatively for Benedict's test for detecting reducing sugars. The osmophores found in this study are constituted uniquely by a papillose or non-papillose epidermis, or they extend into the mesophyll forming scent glands. In both cases, they are associated to stomata and starch grains. The corollas of the other species of Onoserideae did not react positively for osmophores.

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Asteraceae (Onoserideae)和Famatinantheae (famatintheae)花冠中渗透孔的结构和组织化学特征

渗透孔参与气味的产生，其产物、位置、持续时间和解剖结构与其他分泌结构不同。虽然渗透孔在几个科的花中都有很好的记载，但在菊科中却很少被提及。本研究的目的是:1)用组织化学方法测定39种蛇科植物和唯一一种蛇科植物花冠中渗透孔的存在情况;2)分析这些类群中渗透孔的形态和结构。组织化学和组织学技术显示，Famatinanthus Ariza & S.E. Freire和Plazia Ruiz & Pav的花冠边缘和中央有渗透孔。在花冠裂片的顶端和边缘，和在鼻窦处。在TIOFH和TIOFH3(中性红、油红O和碘-碘化钾)染色反应呈阳性后，证实了渗透团;样本在本尼迪克特的还原糖检测中呈阴性反应。本研究中发现的渗透孔是由乳突或非乳突表皮组成的，或者它们延伸到叶肉形成气味腺体。在这两种情况下，它们都与气孔和淀粉粒有关。其他种属的花冠对渗透孢子反应不积极。

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来源期刊

Adansonia 生物-植物科学

CiteScore

1.30

自引率

12.50%

发文量

审稿时长

>12 weeks

期刊介绍： Adansonia is a fast-track and peer-reviewed journal of plant biology, devoted to the inventory, analysis and interpretation of vascular plants biodiversity. It publishes original results, in French or English, of botanical research, particularly in systematics and related fields: morphology, anatomy, biology, ecology, phylogeny, biogeography, etc. All articles published in Adansonia are compliant with the different nomenclatural codes. A copyright assignment will be signed by the authors before publication.