Actinomycete flora Of Japanese soils

Actinomycete flora of Japanese soils

“…As reportt'd in the previous paper (10), the ratio of antagonistic isolates in upland soil was lligher in virgin than in cultivated soil, but ill peat soil the abo',e relation was not observed except in the case against n. sutilis. In upland soil, microorganisms are activated by cultivation, main managements of which are the disturbance of soil and the application of fertilizer, compost and lime etc.…”

“…soil. The ratio of isolates antagonistic against F. oxysporum showed no significant difference as that in upland soil (10), but in Shi. -I. soil, it was higher in virgin than in cultivated soil.…”

“…The ratio and the number of each amylase and cellulase positive actinomycetes in peat soil were higher in cultivated than in virgin soil as the case in upland soil (10). From the fact that both amyl::tse and cellulase are illduced enzymes, 'actinomycetes in cultivated soil are supposed to be under the condition where starch and cellulose can be utilized more easily than in virgin soil.…”

Actinomycete flora of japanese soils

“…The results showed a distinct difference was found between actinomycete flora of both soils, too (2). On the other hand, many forms of soil organisms are well known to show the socalled seasonal change in their abundance.…”

Actinomycete flora of Japanese soils

“…The actinomycete flora of different soil groups has been studied in the authors' laboratory and it was reported that each group has its own characteristic actinomycete flora (18,19,20). Following the previous part, in which actinomycete flora in paddy soils was described from morphological, cultural and biochemical points of view (20), the description will be made on the basis of antibiotic production in the present paper.…”