Abstract
In tripartite rhizosphere (host, fungus, and bacteria) interactions, bacterial antagonism was found to be responsible for the general suppression of pathogen activity at low soil temperature. Host colonization by Pythium aphanidermatum was less than 25% at 20 C, in contrast to greater than 90% colonization at 27 C after 72 h. When bacterial activity was reduced or inhibited by the addition of vancomycin to soil, host colonization by the fungus at 20 C increased to 83%. Generation time of bacteria in intact rhizosphere soil was estimated to be about 8 h at both 20 and 27 C (...)
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