RESUMEN
Colonization of wheat seedlings by epiphytic (Rhodotorula glutinis) and soil (Lipomyces starkeyi) yeasts was studied by scanning electron microscopy. Epiphytic yeast cells dominated on the plant surface. Soil yeast cells were randomly distributed among both the zones of a seedling and the particles of an inorganic substrate. It has been found that epiphytic yeast strains can readily grow on the surface of a plant.
Asunto(s)
Ascomicetos/crecimiento & desarrollo , Hongos Mitospóricos/crecimiento & desarrollo , Plantas/microbiología , Rhodotorula/crecimiento & desarrollo , Saccharomycetales/crecimiento & desarrollo , Rhodotorula/ultraestructura , Saccharomycetales/ultraestructuraRESUMEN
Bond strength during adsorption of microorganisms depends on their growth stages, as was found by light optical and scanning electron microscopy. The strenth of adsorption often decreases as a culture growth on the surface of an adsorbent. Adsorption of microorganisms is an important ecological process. Under favourable conditions, microorganisms grow at a high rate when they are firmly bound to a solid surface. After abundant growth which deteriorates their microenvironment, microorganisms desorb and are dispersed. Such is a distribution of microorganisms growing on solid surfaces.
Asunto(s)
Fenómenos Fisiológicos Bacterianos , Adsorción , Bacillus/fisiología , Bacterias/crecimiento & desarrollo , Bacterias/ultraestructura , Microscopía Electrónica , Rhodotorula/fisiología , Sarcina/fisiología , Serratia marcescens/fisiologíaRESUMEN
Ultrasonic treatment of soil, though being very effective for desorption of cells and deaggregation of microcolonies, may damage and kill microorganisms. Possible application and effectiveness of ultrasonic treatment was studied in this work with chernozem (dry and wet samples), rhizosphere and rhizoplane of pea. An ultrasonic disintegrator of low frequency is recommended for dry soils. Ultrasound cannot be recommended for treating rhizosphere and rhizoplane of plants without checking its effectiveness in each case.