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The influence of metabolites of actinomycetes on some physiological parameters of maize seeds of hybrid of Debut variety (roots formation, growth of coleoptiles) has been studied. The strains of actinomycetes genus Streptomyces were isolated from various soil samples of R.Moldova with different content of humus. The obtained data showed that the number of roots increased considerably under the influence of metabolites of Streptomyces sp .47, Streptomyces sp .123, Streptomyces sp .154 and Streptomyces sp .182 (19,4%, 16,6% and 13,8% respectively, compared with the control - water). The increasing by 33,0 and 44,8% of the main root in comparison with the control was determined after the treatment with metabolites of Streptomyces sp .11 and Streptomyces sp .123 strains. The metabolites of Streptomyces sp .154 and Streptomyces sp .182 strains led to an increasing of coleoptiles length on 31,3 and 38,1% respectively. The dry weight of the roots and coleoptiles exceeded the control on 30-80% and 25-75% respectively in experimental variants. Our research showed that the investigated streptomycetes strains are capable to synthesize the substances which stimulate roots forming and development of stems. In summary, the isolated from Moldavian soils strains of streptomycetes can be considered as potential producers of plant growth regulators.

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