By John L. Lockwood, Alexander B. Filonow (auth.), M. Alexander (eds.)
Advances in Microbial Ecology used to be proven via the foreign Commis sion on Microbial Ecology to supply a motor vehicle for in-depth, severe, and, it truly is was hoping, provocative studies on elements of either utilized and uncomplicated microbial ecol ogy. within the 5 years of its lifestyles, Advances has completed attractiveness as an enormous resource of knowledge and thought either for working towards and f
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Numerous soil microorganisms growing in rich media produce substances which are toxic to other microorganisms. Many of these substances are diffusible and highly potent, and have traditionally been termed antibiotics. Since many antibiotic producers were obtained from soil, might they playa role in soil ecology, especially in mycostasis? Despite several attempts, specific antibiotics have not been detected in natural, unamended, and unaltered soil (Griffin, 1972; Gottlieb, 1976). Nor has any direct mycostatic effect yet been associated with a specific antibiotic in natural, unamended soil.
9 ng/ g soil in surface layer samples of 0-10 cm. 0 ng/g after 10 30 John L. Lockwood and Alexander B. Filonow days. Air-dried soils produced more ethylene than oven-dried (105 C) soils, but both treatments resulted in far greater yields of ethylene than were present in fresh soils. It appears, therefore, that ethylene concentrations emitted from air-dried or oven-dried soils may be an over-estimation of those levels normally present in soil in the field. Colonizable substrate is required for any appreciable ethylene production in soil.
Mycostasis of B. cinerea conidia was closely related to microbial competition for amino acids. A common leaf saprophytic bacterium, Pseudomonas sp. isolate 14, competed very actively for amino acids in glucose-amino acid mixtures and removed 80% from solutions in 5 hr (Brodie and Blakeman, 1976). Inhibition of conidial germination was closely correlated with amino acid uptake by this bacterium. The fungal spores, on the other hand, took up amino acids relatively slowly. Their germination was stimulated more by amino acids than by glucose, for which the bacterium competed less well.
Advances in Microbial Ecology by John L. Lockwood, Alexander B. Filonow (auth.), M. Alexander (eds.)