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Leaf anatomy of Vriesea (Tillandsioideae–Bromeliaceae)
Brittonia ( IF 0.9 ) Pub Date : 2021-01-07 , DOI: 10.1007/s12228-020-09645-6
Christian Gomes Faria , Andressa Silva Silva , Raylla Karine Pereira de Melo , Artur Manoel Leite Medeiros , Ana Maria Donato , Andrea Ferreira da Costa , Bárbara de Sá Haiad

The Bromeliaceae are a largely Neotropical family originating in open, dry environments. Vriesea Lindl. , the third largest genus of the family, is traditionally divided between two sections. About 90% of the species of the genus occur in Brazil, where the centre of diversity is the Atlantic Rainforest. Leaf morphoanatomical studies conducted on bromeliad species have confirmed the importance of structural characters for ecological, and also for systematic purposes. Because of the wide morphological, ecological and taxonomic diversity of Vriesea , and its importance in ecosystems associated with the Atlantic Rainforest, we selected 24 Vriesea species and used anatomical and histochemical analyses to describe the leaf anatomy aiming to identify potential systematic characters, and point out possible traits that responded to environmental conditions during the evolution of the genus. The leaves are hypostomatic with peltate trichomes. They present epidermis with thickened cell walls, with lignin and pectin, covered by cuticle and epicuticular wax. The mechanical hypodermis is usually one-layered. Water-storage parenchyma occurs in both surfaces of the leaf blade. The chlorenchyma is located in the median portion of the blade. Air lacunae are associated with brachiform parenchyma. The vascular bundles are collateral, arranged alternately with the air lacunae and surrounded by a sheath of sclerified and/or parenchyma cells. Extravascular fibres occur in most of the species and are positioned below the mechanical hypodermis on the adaxial surface of the leaf blade. Leaf anatomical analysis can be useful in differential characterisation of small groups of related species but does not seem to reflect species assemblages according to the taxonomic sections or substrate type, but is consistent among the Brazilian analysed species of Vriesea .

中文翻译:

Vriesea (Tillandsioideae–Bromeliaceae) 的叶解剖

凤梨科是一个主要的新热带科,起源于开放、干燥的环境。弗里西亚林德尔。是该科的第三大属,传统上分为两个部分。该属的大约 90% 的物种出现在巴西,那里的多样性中心是大西洋热带雨林。对凤梨科植物进行的叶形态解剖学研究证实了结构特征对生态和系统目的的重要性。由于 Vriesea 广泛的形态、生态和分类多样性,以及它在与大西洋雨林相关的生态系统中的重要性,我们选择了 24 个 Vriesea 物种并使用解剖和组织化学分析来描述叶片解剖结构,旨在识别潜在的系统特征,并指出在该属进化过程中对环境条件做出反应的可能特征。叶下口有盾状毛状体。它们呈现细胞壁增厚的表皮,带有木质素和果胶,被角质层和表皮蜡覆盖。机械皮下组织通常是一层的。储水薄壁组织发生在叶片的两个表面。绿藻位于叶片的中间部分。空气腔隙与臂状实质有关。维管束是侧支的,与空气腔交替排列,并被硬化和/或薄壁细胞的鞘包围。血管外纤维存在于大多数物种中,位于叶片正轴表面的机械皮下组织下方。
更新日期:2021-01-07
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