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The Physiology of Virus Diseases in Plants: Vi. Some Effects of Mosaic on the Metabolism of the Tomato
Author(s) -
CALDWELL JOHN
Publication year - 1934
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.1744-7348.1934.tb06900.x
Subject(s) - biology , respiration , dry matter , inoculation , dry weight , virus , host (biology) , horticulture , mosaic virus , metabolism , agronomy , botany , physiology , zoology , plant virus , biochemistry , ecology , virology
Summary. The literature dealing with the effect of virus diseases on the metabolism of the host plants is briefly summarised. Results are presented of work which has been carried out on the aucuba or yellow mosaic in tomato. The effect of time of inoculation has been studied in some detail. It has been found that the plant is generally reduced by the disease, and that the carbohydrate and dry‐matter content of the diseased plants is less than that of the controls. The stage of development of the plant is not apparently affected by the disease; the diseased plants, though reduced in size, have the same number of leaves and flower trusses as the controls. The nitrogen content is not materially affected by the disease. The effect of the disease on the respiratory mechanism of the host tissues has been examined, and it has been established that the CO 2 , output of these tissues is higher than that of the controls. This is found when the output is expressed in mg. of CO 2 , per three‐hour period in terms of the initial fresh weight, the residual dry‐matter content or of the residual nitrogen content. The higher CO 2 , output is also found ill respiration in oxygen or in nitrogen. This has been attributed to all increase in the efficiency of the enzyme system of the diseased plants.