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 automobile for in-depth, severe, and, it's was hoping, provocative studies on points of either utilized and simple microbial ecol ogy. within the 5 years of its lifestyles, Advances has accomplished reputation as a huge resource of knowledge and suggestion either for practising and f
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M. Smith (1973), who showed sensitivity of S. rolfsii to 1 ppm ethylene, most fungi tested to date do not appear to be sensitive to ethylene. Germination of B. , 1978). Conidia of B. cinerea that had endogenous nutrients removed by leaching were similarly not sensitive to ethylene. Pretreating conidia in culture with 5-10 ppm ethylene for 1-3 days prior to germination did not increase the sensitivity of conidia to ethylene in the germination assay, nor did pretreating the soil with ethylene for several days prior to the assay.
Nor has any direct mycostatic effect yet been associated with a specific antibiotic in natural, unamended soil. Antibiotics have been detected, however, in sterilized soils which were inoculated with antibiotic producers. , 1969) which had been inoculated with antibiotic producers. Within nutrient-rich loci in soil, antibiotics may very well playa role in microbial colonization of a substrate, and this may be a rewarding area of research. In natural, unamended soil, however, the paucity of nutrients places severe restrictions on microbial growth and presumably on antibiotic produc- 26 John L.
Solani f. sp. ' Fungal Responses to Nutrient Limits 39 a pore size small enough to exclude the passage of compounds of molecular weight greater than 1000, and these membranes were incubated on soil (Ko and Lockwood, 1970). The membranes also were highly resistant to microbial degradation in soil. Living hyphae were lysed in a manner similar in character to that occurring directly in soil. Heat-killed hyphae, on the other hand, did not lyse. Any lytic enzymes present in the soil should have been excluded by the membrane or, if not, should have lysed the killed hyphae.