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The respiration of leaves showing necrotic local lesions following infection by tobacco mosaic virus
Author(s) -
SUNDERLAND D. W.,
MERRETT M. J.
Publication year - 1965
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.1744-7348.1965.tb01264.x
Subject(s) - respiration , biology , lesion , tobacco mosaic virus , nicotiana tabacum , respiration rate , horticulture , dinitrophenol , botany , virus , mosaic virus , respiratory system , virology , plant virus , anatomy , pathology , biochemistry , medicine , gene
SUMMARY At 25°C. the respiration rate of leaves of Nicotiana tabacum L. var. Xanthi infected with tobacco mosaic virus increased before the appearance of local lesions. The increase was directly proportional to lesion number at low, but not at higher, lesion densities. With temperatures at which the infected leaf showed necrotic lesions the difference in respiration rates between healthy and infected leaves was greater than at 35°C., at which temperature infected leaves do not develop necrotic lesions. The concentration of 2 ,4‐dinitrophenol (DNP) that gave maximum stimulation of the respiration of the healthy leaf was 10 ‐5 M, but even this respiration rate was less than that of the infected leaf showing local lesions. DNP had no effect on the respiration of the infected leaf showing a dense lesion cover. At 35°C., DNP increased the respiration rate of infected leaves and the maximum respiration rates for healthy and infected leaves in the presence of DNP were similar.