Actinomycetologica
Online ISSN : 1881-6371
Print ISSN : 0914-5818
ISSN-L : 0914-5818
Volume 4 , Issue 1
Showing 1-15 articles out of 15 articles from the selected issue
Original Article
  • Yoko Takahashi, Yoshiko Seki, Yoshitake Tanaka, Ruiko Oiwa, Yuzuru Iwa ...
    1990 Volume 4 Issue 1 Pages 1-6
    Published: June 25, 1990
    Released: March 01, 2008
    JOURNALS FREE ACCESS
    Vertical distribution of microorganisms in soils was studied. The largest populations of bacteria (108/g of dried soil), actinomycetes (107/g) and fungi (105/g) were observed in soils from the top layer (0∼30cm in depth) of black color loam. Reduced numbers of bacteria and actinomycetes, but few fungi, were detected in soils of the second upper layer (50cm∼5m) of black loam. Bacteria (106/g) were also found even in silty sand soils of 40m depth. Vertical distribution of actinomycetes was examined in detail in soils of 0∼100cm depth taken at a 10cm interval. The actinomycete population was the largest in soils of the surface layer (0∼10cm), and decreased gradually as the depth increased. A comparative survey of all the isolates showed that ca. 80% of different kinds of actinomycete cultures were isolated from surface soils. It was demonstrated that actinomycetes peculiar to individual soil layers existed.
    Download PDF (777K)
Note
Prodeedings of The Symposium on Actinomycetes: Yesterday, Today and Tomorrow -Biology of Streptomyces griseus '90- January 19, 1990 at the Science Council of Japan
feedback
Top