Studies on Diplodia and Diplodia-like fungi: V. Effects of carbon:nitrogen ratio on growth, pycnidia, and pycnidiospore formation
AuthorsR. K. Webster
W. B. Hewitt
M. M. Satour
Authors AffiliationsR. K. Webster was Associate Professor of Plant Pathology and Associate Plant Pathologist in the Experiment Station, Davis; W. B. Hewitt was Professor of Plant Pathology and Plant Pathologist in the Experiment Station, Davis, and Assistant Director, Agricultural Field Stations, San Joaquin Valley Research and Extension Center, Parlier; M. M. Satour was Postgraduate Research Plant Pathologist, Department of Plant Pathology, Davis. He is now with the Department of Plant Pathology, Ministry of Agriculture, Orman, Giza, United Arab Republic.
Hilgardia 41(5):95-105. DOI:10.3733/hilg.v41n05p095. November 1971.
Isolates of Diplodia natalensis and Botryodiplodia theobromae were grown on synthetic media containing various concentrations of carbohydrate and nitrogen sources in different carbon:nitrogen ratios. Varying the ratio affected pigmentation, pycnidia shape and size, distribution of pycnidia, presence or absence and amount of stromata, presence or absence of hairs or setae on pycnidia, and number of pycnidiospores produced. Size and ornamentation of pycnidiospores were least affected. D. natalensis and B. theobromae are considered synonymous, since the results show that characters used previously for identification are significantly influenced by the growth media.
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