Variety-specific actinomycete complexes associated with barley roots in soddy podzolic soil

The root-colonizing actinomycete complexes of genotypically different barley plants grown in soddy podzolic soil were found to contain streptomycetes of the sections Cinereus (series Chromogenes, Achromogenes, and Aureus) and Roseus (series Fradiae), dominant being streptomycetes of the section Cinereus ser. Chromogenes. The abundance and diversity of soil streptomycetes in the barley rhizoplane increased in the order: var. 999-93 < var. Kumir < var. Novichok < var. 889-93. Experiments revealed functional specificity in the root-associated actinomycete complexes of different barley varieties. The actinomycete complex colonizing the barley var. 999-93 roots was distinguished by a wide range of utilizable root exudate metabolites and a low occurrence rate of antagonistic species.