Role of Ethylene And Abscisic-acid IN Tmv-induced Symptoms IN Tobacco

Bailiss, K. W. and Balázs, Ervin and Király, Zoltán (1977) Role of Ethylene And Abscisic-acid IN Tmv-induced Symptoms IN Tobacco. ACTA PHYTOPATHOLOGICA ACADEMIAE SCIENTIARUM HUNGARICAE, 12 (3-4). pp. 133-140. ISSN 0001-6780

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Abstract

Xanthi-nc tobacco leaves pre-treated with ABA or with Ethrel exhibited senescence and increased the number of TMV local lesions. Changes in local lesion numbers were not associated with similar changes in recoverable infective TM V. Endogenous ABA progressively increased in leaves as TM V lesions developed. When BYM V-infected leaves of Tetragonia expansa were exposed to ethylene, necrotic spots developed in the normally chlorotic lesions. An inhibitor of ethylene action, namely CO2, was able to inhibit the development of chlorotic lesions in infected Tetragonia leaves. In a systemic host-pathogen combination (cultivar Samsun infected by TM V) both Eth rel and A BA caused dwarfing in healthy and in infected plants. Regarding the effect of ABA, it is proposed that an A BA-induced stimulation of ethylene release exists and this would be directly involved in the reduction of extension growth.

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