Abstract
This report deals with a part of the results obtained in the observations on the metabolisms in rice plant affected with the dwarf disease virus (Oryza virus 1).
(1) Oxigen consumption (Qo2) and respiratory quotient (RQ) of the diseased rice plant are larger than those of the healthy. It appears that the respiration of rice plant becomes vigorous as it infects to the disease examined (Table 1).
(2) Rice plant has ascorbic acid oxidase as one of the terminal oxidases. The oxidase activity is not effected by the dwarf disease virus (Table 2-6).
(3) The value of the oxidative phosphorylation (P-O ratio) is larger in the diseased plant than in the healthy plant (Table 7).
(4) The phosphatase activity of the rice plant is stronger considerably in the diseased plant than in the healthy (Table 8).
(5) The amount of inorganic phosphorous compound becomes remarkably smaller, but the contents of organic and nucleic acid phosphorous compounds are considerably larger, in the diseased plant than in the healthy plant (Table 9). And the total phosphorous in the diseased plant is slightly larger than in the healthy plant.
(6) As far as the results are concerned, the nucleo-proteins and nucleic acids (RNA. DNA) in rice plant seem not to be influenced upon their qualities and quantities by the dwarf disease virus (Fig. 1, 2 and 3).
From the results observed, it may be concluded that the respiration and phosphorous metabolisms of rice plant become rather vigorous when it is affected with the dwarf disease virus.
