Anna Weinhold

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Armillaria mellea produced abundant rhizomorphs when grown on a chemically defined medium containing ethanol at concentrations as low as 50 parts per million. In the absence of ethanol no rhizomorphs were formed. Rhizomorph production was also stimulated by I-propanol, isopropanol, and 1-butanol as well as by acetaldehyde (to a lesser extent). Potassium(More)
Respiration and growth of Pseudomonas putida PpG7, containing catabolic plasmid NAH7, was determined in three agricultural field soils amended with the carbon source salicylate. The addition of salicylate to soil significantly increased the population of PpG7. However, there was a lack of relationship between microbial numbers and activity as determined by(More)
Sodium salicylate (1,000 mug/ml) was delivered through a drip irrigation system to agricultural field soils planted to tomato and infested with Pseudomonas putida PpG7, the host of the salicylate catabolic plasmid NAH7. In nonfumigated soils infested with approximately 10 CFU of PpG7 per g in the top 30 cm, population densities were increased up to 112-fold(More)
The production of antibiotics and their role in microbial competition under natural conditions can be readily studied by the use of transposon mutants. Several antibiotic-producing strains of Erwinia carotovora subsp. betavasculorum were unable to accept foreign DNA. A plasmid delivery system was developed, using ethyl methanesulfonate mutagenesis, which(More)
The Department of Plant Pathology at the University of California at Berkeley was destroyed as a consequence of a contentious reorganization. The circumstances that led to the reorganization provide some insight into the challenges facing the discipline of plant pathology. The underlying basis for plant pathology as a science is to address problems of plant(More)
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