Abstract
1. Using the WARBURG'S respiration manometer, the respiration of the tissues of tobacco plants infected by ordinary mosaic virus was compared with that of the healthy plants.
2. In the diseased leaf tissues, the amounts of oxygen consumption and carbon dioxide production are greater than the healthy one, but the repiratory quotient shows the similar value of about 0.94. Anaerobic respiration is also stronger in the diseased leaves. The increase of respiration in the diseased leaves is markedly accelerated in older infected leaves.
3. In the root tissues, the consumed oxygen is the same degree in the diseased and healthy plants. The carbon dioxide production both in the aerobic and anaerodic conditions is very low in the mosaic plants. It is considored that the low value of respiratory quotient is due to the imcomplete oxidation in the process of the aerobic respiration in diseased plants.
4. The expressed juice of the mosaic plants showed no detectable gas exchange.
5. The expressed juice of diseased leaves does not affect the respiratory rate pollen of Lilium longiflorum.
