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Nitrogen Content in Relation to Fungal Growth in Apples *
Author(s) -
Colhoun John
Publication year - 1948
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1948.tb07404.x
Subject(s) - nitrogen , biology , malic acid , sugar , fusarium , botany , nutrient , growth rate , food science , citric acid , chemistry , ecology , geometry , mathematics , organic chemistry
The effects of change in the concentrations of nitrogen, malic acid and sugar in a standard nutrient medium on the rate of spread of Cytosporina ludibunda Sacc. and Fusarium fructi‐genum Fr. have been studied. At low concentrations the rate of radial spread of Cytosporina ludibunda falls as nitrogen increases from about zero to 0.03 %, whereas at high acid concentrations the rate of spread increases with nitrogen increasing within the same range. At an intermediate concentration of acid spread is unaffected by varying nitrogen content. The response of Fusarium fructi‐genum to nitrogen is similar to that of Cytosporina ludibunda except that the acid content at which the reversal of the relationship between radial spread and nitrogen concentration occurs is lower than that for C. ludibunda. The presence of extracts from lentils or apples in media increases the rate of the radial spread of C. ludibunda and lowers the acid concentration at which there occurs a reversal from the direct relationship between radial spread and nitrogen content to an inverse relationship.