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This study compares photosynthetic and structural features of Dichaea cogniauxiana and Epidendrum secundum leaves and roots. The diurnal titratable acidity fluctuations indicated crassulacean acid metabolism (CAM) in E. secundum leaves, associated with anatomical features like thick cuticle, large and vacuolated cells, and reduced stomata size and frequency. Roots of both species had chloroplasts...
This study focuses on the development of a secondary root structure in Rhynchosia edulis Griseb. (Leguminosae). Its principal objectives are (i) to study the origin of cambia and the nature of their products; (ii) to correlate root structure to habitat; and (iii) to compare this anatomy with that of other Leguminosae species growing in the same environment. Serial transverse cuts of the main root...
The aims of the present study were (i) to compare the anatomical structures of roots from legume species belonging to the tribes Aeschynomeneae, Fabeae (syn. Vicieae), and Trifolieae (Papilionoideae); (ii) to characterize those developmental stages of roots that are most useful for comparative studies; (iii) to characterize root developmental patterns during their growth from primary to adult structures;...
We discuss here the anatomical variations of the arrangements and compositions of stele types observed in different roots types in four populations of the three species of Philodendron as probable adaptations to their habitats. Terrestrial individuals of P. corcovadense have cylindrical steles while rupicolous individuals have lobate steles with dispersed internal cortical parenchyma. The Philodendron...
Herbaceous perennial plants are an important part of the biodiversity of the subhumid western slopes of New South Wales, Australia. However, these species are usually ‘out of sight, out of mind’ as while they are perennials, they are usually relatively small and they die back to an underground perennating structure during dry periods. These structures are critical for survival as they store non-structural...
A series of experiments was carried out to investigate possible structural or biochemical alterations in Gossypium hirsutum plants after a long term (21days) exposure to non ionizing radiation (1882MHz) emitted from the base unit of a cordless DECT system. Exposed plants, compared to the negative (matched) controls, seem to be seriously affected. Notably lower biomass production for the above ground...
Roots of epiphytic orchids typically possess a velamen radicum, a multiple epidermis composed of dead cells. It is largely unexplored how the structure of the velamen, the cortex and vascular cylinder facilitate the flow of water and nutrients towards the plant. Up to now, structural root features were rarely correlated with functional attributes. In this study, we compare anatomical features with...
A series of experiments was carried out to investigate possible structural or biochemical effects on young Zea mays plants after a long-term exposure to non-ionizing, continuous radiation emitted from the base unit of a cordless DECT system. Exposed plants, compared to their normal counterparts, do not seem to be affected concerning their sprouting potential, biomass production for both the above...
Sprouts of Pinus halepensis were incubated and cultured in the laboratory under controlled conditions to investigate their response to a long-term exposure to continuous, non-ionizing radiation emitted from the base unit of a cordless DECT system. Exposed plants, compared to their control counterparts, seem to be affected since they exhibit lower sprouting potential, minor fresh weight and biomass...
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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