By B. A. Rubin
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Extra resources for Biochemistry and Physiology of Plant Immunity
Kuprevich considers that proteolytic enzymes and amidases, which had not been found by him in obligate parasites, have the most destructive effect on plant cells. Their absence, or insignificant activity, in obligate parasites results in the fact that the penetration of these parasites into the tissues of the host plant does not lead to marked changes in the metabolism of the latter. The cytochemical method appears to offer the best prospects in the study of enzymic activity of obligate parasites.
Lycomarasmine is responsible for the occurrence of necroses at the tips and the periphery HETEROTROPHIC MICRO-ORGANISMS 45 of tomato leaves, attacked by fusarial wilt (Gäumann, Naef-Roth and Miescher, 1950). Fusaric acid was isolated for the first time as a component of toxic secretions from Fusarium heterosporum Nees, parasitizing rice (Yabuta, Kambe and Hayashi, 1934). Later fusaric acid was also found in the toxin of Fusarium lycopersici, and as a component of this toxin has been widely studied by a number of scientists, chiefly by the school of Gäumann (Gäumann, Naef-Roth and Kobel, 1952a, 1952b; Plattner, Keller and Boiler, 1954).
At the same time the greater utilization of amino nitrogen by parasitic forms must be connected with their greater adaptability to the assimilation of amino acids, produced in plant tissues as a result of the action of the parasite. Amide compounds and up to 11 mg per cent of ammonia were found in the culture medium after the growth of Botrytis einerea (Artsikhovskaya, 1941). Considerable accumulation of ammonia in the tissues of HETEROTROPHIC MICRO-ORGANISMS 43 white cabbage, infected with Botrytis, was found by Rubin and Ivanova (1959a).
Biochemistry and Physiology of Plant Immunity by B. A. Rubin