A rhythmic pattern of zone formation of Streptomyces colonies and the state of the near-Earth space

The effect of heliogeophysical factors on the periodicity of formation of c oncentric rings of sporogenous air mycelium on the surface of radiant strep tomycete colonies was studied. The process proceeds as several successive w aves of zone formation. Environmental changes were recorded on the surface of Streptomyces levoris colonies as variations of the zone-forming rhythm, just as in age-related structures of higher animals and plants. The frequen ce of zone formation was shown to vary regularly with the time of inoculati on, season, and as a result of rapid transmeridional movements. The role df the growing apical membrane and the branching of the substrate mycelium hy phae in recording of environmental changes is discussed.