Symptom expression, virus concentration and respiration in the leaves ofDolichos lab lab infected with dolichos enation mosaic virus
InDolichos lab lab infected with Dolichos enation mosaic virus (DEMV) symptom expression is more severe in winter than in summer, while relative virus concentration, assayed serologically, is higher in summer than in winter. The virus concentration reaches its highest peak on the 8th day after inoculation in the first trifoliate leaves that emerge after inoculation of primary leaves, thereafter reaching the lowest concentration on the 10th day in all the leaves.
Respiration is higher in the infected leaves during the initial increase in the relative virus content. But when the concentration of virus is highest (on the 8th day), the rate of oxygen uptake is significantly lower than in the healthy controls. Thus the sudden decrease in the virus concentration on the 10th day is preceded by a low rate of respiration on the 8th day, when the RQ also is much lower in the infected tissue than in the corresponding healthy controls.
A Ramadasan1 2