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Anatomical information serves as an important tool in identifying plants at their vegetative stage. The leaf, stem and root anatomy of Vanda spathulata (L.) Spreng., Vanda tessellata (Roxb.) Hook. ex G.Don, Vanda testacea (Lindl.) Rchb.f., and Vanda wightii Rchb.f., belonging to the tribe Vandeae in subfamily Epidendroideae were examined using different staining techniques. The important characters...
Studies on breeding systems and flower morphology are valuable to infer how environmental factors impose evolutionary change in plants. This study focused on the characterization of floral morphs and reproductive systems in Pachycereus pringlei and how this iconic columnar cactus might be a useful genus to understand the evolution of these highly variable structures. We determined breeding systems,...
We studied species richness and community composition as well as the vertical distribution of ferns and lycophytes in three forest types along an elevational gradient in the region of Los Tuxtlas, Mexico. We established 23 plots of 20m x 20m at 150–1650m, recording presence-absence of all species in eight vertical distribution zones (terrestrial and seven epiphytic zones). We found 84 species, including...
This study analyzes the morpho-anatomy of fruit development, as well as histochemical aspects of mature fruits of the Amazonian palm Attalea microcarpa. The fruit of this palm is a fibrous pyrenarium, developing from a superior ovary, with major developmental changes taking place in the mesocarp and endocarp. The mesocarp presents three strata, the first of which is fibrous and comprised of parenchyma,...
Coleanthus subtilis is a rare ephemeral plant species that grows on exposed river banks or pond bottoms. Its natural European localities are considered to be historical ones; however, new localities in man-made habitats have been increasingly reported. Although C. subtilis is protected under international agreements, little is known about the influence of soil chemistry on this species, thus we ask...
Paullinieae lianas are noteworthy for possessing cambial variants, so it is not surprising that the structure of the vascular system has been the focus of most of anatomical studies involving these plants. However, secretory structures remain understudied in the tribe and in the family Sapindaceae as whole. This study aims to characterize the secretory structures in the stems of five lianas of Paullinieae...
Abscisic acid (ABA) attenuates stomatal conductance (gs) and transpiration (E) in response to drought. Broadly known as ‘Brazilian savanna’, the Cerrado sensu lato is a mosaic of landscapes, including savanna-type vegetation, such as the cerrado sensu stricto (s. str.), and riparian forests occurring along rivers. These habitats share floristic elements, and congeneric species are adapted to grow...
Mangroves are expanding northward along the eastern coast of Florida and invading saltmarsh communities along the tributaries and main channels of rivers that flow into the Intracoastal Waterway system. To investigate R. mangle’s demography, reproductive effort and survivorship of offspring were monitored for three years along the Matanzas River, northern Florida. Flowering was delayed, fruit production...
The effects of polycyclic aromatic hydrocarbons (PAHs) on cell ultrastructure in the mangroves Avicennia marina and Rhizophora mucronata were investigated. One-year-old seedlings of both species were subjected to sediment oiling with Bunker fuel oil 180. In both species, fresh sections of root tips from the control, stained with fluorescein diacetate, exhibited green fluorescence indicating living...
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