RESPIRATORY INCREASE AND PHOSPHORUS AND NITROGEN METABOLISM IN SWEET POTATO INFECTEFD WITH CERATOSTOMELLA FIMBRIATA
1956 Volume 43 Issue 5 Pages 579-587
Details
1956 Volume 43 Issue 5 Pages 579-587
1. Changes in the metabolism of sweet potato tissue induced by infection with Ceratostomella fimbriata were studied.
2. The respiration of sound tissue adjacent to the infected tissue was about twice greater as much as the control 72 hours after the fungus inoculation ; thereafter it dropped. Rate of the respiratory increase due to DNP addition was reciprocal to that of the respiratory increase caused by the fungus infection, and the finding was assumed to be caused by the acceleration of ADP generation in the tissue.
3. In the sound tissue next to the infected, inorganic phosphate decreased in line with organic phosphate formation, and a concomitant increase of acid insoluble nitorogen conpounds (protein) occurred, a decrease of acid soluble nitrogen compounds (amino acids and amides) being also observed. These facts indicate an activation of anabolism in the infected sweet potato, but occasionally at one stage (72 hours) Pi increase was found, and the partial participation of an uncoupling reaction or the activation of ATP-ase is suggested.
4. In the infected sweet potato, the levels of phospholipide and RNA remained unchanged.
We wish to express our thanks to profs. Y. Sumiki and S. Funahashi, University of Tokyo, for their cordial advices and helpful suggestions and also for the assistance of Mrs. M. Uritani, Miss Y. Hirata and Mr. M. Egawa.
This communication was already presented before the meeting of the Agriculture) Chemical Society of Japan (Tokyo, December 18, 1954).
