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The effect of store conditions on the rotting of apples, cv. Bramley's Seedling, by Nectria galligena
Author(s) -
SWINBURNE T. R.
Publication year - 1974
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.1744-7348.1974.tb01483.x
Subject(s) - seedling , horticulture , inoculation , incubation , biology , agar , incubation period , botany , bacteria , biochemistry , genetics
SUMMARY The log of the time interval between inoculation with Nectria galligena in October and the onset of rotting in apples held in air was proportional to the deficit between the temperature of incubation and 25°C, but temperature did not affect the rate of subsequent rot expansion. Rots expanded equally fast whether apples were held in dry or moist air. The quantity of rotted tissue obtained after incubating inoculated apples in atmospheres containing up to 12.5% CO 2 increased with increasing concentrations of CO 2 greater than 2.5%. The quantity of rotted tissue obtained in apples incubated in 10% CO 2 was three times as great as that obtained after incubation in air. The incidence of natural rots was lower in apples stored at 4% CO 2 than in those stored in air and rotting increased with increasing concentrations of CO 2 higher than 4%. Colonies of N. galligena grew faster on malt agar plates incubated in 5% CO 2 than in air, but growth was slower in 10% CO 2 than in air. The quantity of benzoic acid per mg hyphae accumulated in developing lesions was similarly related to the CO 2 concentrations up to 2.5% but decreased at higher concentrations, and the quantities found in apples stored in CO 2 concentrations >5.0% CO 2 were less than in those stored in air.