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The ecological and physiological features of some rare psammophilous plant species of Armenia, included in the Red Book of the RA, Calligonum polygonoides, Astragalus paradoxus and Scorzonera gorovanica have been investigated. As a result of the studies, it was found that the above-mentioned species in the conditions of the Yerevan Botanical Garden showed higher indexes of the water regime and the intensity of photosynthesis and transpiration in comparison with samples from “Gorovan Sands” sanctuary. Each of the studied species has adapted to the current conditions of existence and has occupied a certain ecological niche, using its mechanisms for regulating the water regime, the intensity of transpiration and photosynthesis for this purpose. However, all these species have a certain ecological plasticity, which allowed them to adapt to new, different conditions in the Yerevan Botanical Garden. [ABSTRACT FROM AUTHOR]

The action of hybrid complementary genes of Dwarf I on the functioning of root system of plant, intensity of photosynthesis and on catalase and chlorophills activity was investigated. The comprehensive manifestation of hibrid complementary dominant genes interaction was revealed during the ontogenetic developments. [ABSTRACT FROM AUTHOR]

The ultrastructure characteristics of photosynthetic tissues and dynamic of content of chloroplast pigments from different organs of horsetail (Equisetum arvense L.) were studied. In chlorenchyma cells of lower branches from vegetative shoots the clusters of chloroplasts with differentiated structure have been identified. The key role of lower branches chlorenchyma in chlorophyll accumulation during ontogenesis was ascertained. [ABSTRACT FROM AUTHOR]

It was investigated the photosynthetic activity and safety of buds in winter of growing in different microclimatic conditions 6 wildfruit- bushes . It was shown that in conditions of high light intensity, high temperature and low humidity of air is high than in that growing places, which characterized by alternative picture of mentioned surroundings factors. Simultaneously positive connection observed betweeua photosynthesis intensity and buds winter safety. The received results are discussed from point of view of plant adaptation to microclimatic conditions, accumulation o f photo assimilates in buds and influence of these processes of surrounding factors. [ABSTRACT FROM AUTHOR]

It is known that the addition of methanol to the culture medium stimulates the photosynthetic productivity of some species of microalgae, but its influence on the biochemical composition of the biomass has not been investigated. The aim of the present work is to determine the effect of methanol (50 mM) on the content of free amino acids, solub le proteins and reduced nicotinamide coenzyme NAD(P)H in C. reinhartdii cells. It is shown that in case of illumination of C. reinhardtii methanol raises intracellular content of NAD(P)H four times more efficiently than in the darkness. Total content of free amino acids is increased and their ratio is changed. The concentration of glutamic acid, glutamine, alanine, serine and tyrosine also increases. The concentration of valine and methionine is reduced. Growth of culture with methanol is followed by an increase in the content of intracellular protein by 30% after 20 hours of cultivation. The obtained data indicate that methanol stimulates growth of C. reinhardtii, not only as a result of additional carbon utilization, but also due to improved nitrogen assimilation and the impact on the energy metabolism of cells. [ABSTRACT FROM AUTHOR]

Morphological and anatomical features of floating and submerged (linear and dissected) leaves have been analyzed for Trapa natans L. plants, which characterized by heterophylly. The presence of various types of leaf lamina structure in floating and submerged leaves was confirmed. The morphological and anatomical features of two types of submerged leaves are differed from the features of floating leaves in vegetative phase of growth by the next features: form of leaf lamina, type of mesophyll, cell's size, number of cellular layers of photosynthesizing parenchyma, and an absence of stomata. [ABSTRACT FROM AUTHOR]