By B. A. Rubin
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Additional resources for Biochemistry and Physiology of Plant Immunity
Tenuis Nees. tenuis Nees. Source of fungus Type of nutrition Apple leaves Pear leaves Carrot roots Cabbage leaves Birch seeds Clover seeds Sainfoin seeds Peppers Paper Forest soil Field soil Parasite Parasite Parasite Parasite Fac. parasite Fac. parasite Fac. parasite Saprophyte Saprophyte Saprophyte Saprophyte 1957) Amino nitrogen 4Ί4 4-27 5-09 5-77 9-59 10-26 11-43 16-10 16-31 22-50 29-43 Considerable accumulation of amino nitrogen in the environment after the growth of saprophytic forms would seem to indicate a more vigorous extracellular enzyme system of these organisms.
The effect exerted on metabolism of the plant host by the toxin of one of the phytopathogenic bacteria — Pseudomonas tabaci, a tobacco leaf parasite, is of interest. When infected with this organism, a small necrotic spot appears on the leaf blade, around which is formed a ring of necrosed tissue, 1-2 cm diam. This spot is free from bacteria and is the result of the action of toxin only. Braun and his co-workers (Braun, 1950; Wooley, Schaffner and Braun, 1955) have been able to show that the effect of this toxin is limited to a disturbance in methio- 48 BIOCHEMISTRY AND P H Y S I O L O G Y OF P L A N T IMMUNITY nine metabolism.
Blackman and Mefferd (1956) found that the ability of Sphacelotheca cruenta (growing on Czapek's medium) to oxidize various substances is almost the same in the mycelial as in the sporidial phases of development. According to the authors' data nitrogen-containing substances are oxidized somewhat less intensively than carbohydrates. Under conditions of adequate aeration the fungi oxidize carbohydrates until the end products of disintegration, C 0 2 and H 2 0 are obtained. At the same time they also possess an enzyme system, which enables them to carry out various types of fermentation.