Seven species of obligately aerobic photosynthetic bacteria of the genera Erythromicrobium, Erythrobacter, and Roseococcus demonstrated high-level resistance to tellurite and accumulation of metallic tellurium crystals. High-level resistance without tellurite reduction was observed for Roseococcus thiosulfatophilus and Erythromicrobium ezovicum grown with certain organic carbon sources, implyin...

1. The roles of ubiquinone-IO and of rhodoquinone in photosynthetic ATP formation were studied with chromatophores from a blue-green mutant (G-9) of Rhodospirillum rubrum. 2. Chromatophores contained ubiquinone-10 and rhodoquinone in amounts equal approximately to 50% and lo%, respectively, on a molar basis, of that of bacteriochlorophyll. Other quinones were not present in appreciable amounts....

Growth, development and plants productivity are usually affected by photosynthetic pigments activity. Magnetic fields are known to induce biochemical changes and could be used as a stimulator for growth related reactions including affecting photosynthetic pigments. The impact of magnetic field strengths on chlorophyll and carotenoids were investigated in this study through the use of date palm ...

The effect of actinomycin D on the synthesis of the photosynthetic apparatus during illumination of etiolated leaves of Phaseolus vulgaris was studied. The increase of chlorophyll content and of the activities of some photosynthetic enzymes (NADPH diaphorase, ferredoxin, NADP(+) glyceraldehyde-3-phosphate dehydrogenase) was compared with simultaneous measurements of the level of other enzymes n...

Safe and efficient conversion of solar energy to metabolic energy by plants is based on tightly inter-regulated transfer of excitation energy, electrons and protons in the photosynthetic machinery according to the availability of light energy, as well as the needs and restrictions of metabolism itself. Plants have mechanisms to enhance the capture of energy when light is limited for growth and ...

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We investigated the presence of endophytic rhizobia within the roots of the wetland wild rice Oryza breviligulata, which is the ancestor of the African cultivated rice Oryza glaberrima. This primitive rice species grows in the same wetland sites as Aeschynomene sensitiva, an aquatic stem-nodulated legume associated with photosynthetic strains of Bradyrhizobium. Twenty endophytic and aquatic iso...

Background: Medical plants production, including borago, is for maximum productivity from their effective ingredients’. Flowers, leaves and seed oil are medical parts of borago. Unfortunately, because of little breeding and domestication programs in medical plants, including borago, their establishments are usually slow. One of the effective techniques for solving this problem is seed priming. ...