Ethrel induced leaf senescence and increased TMV susceptibility in tobacco

Balázs, Ervin and Gáborjányi, Richard (1974) Ethrel induced leaf senescence and increased TMV susceptibility in tobacco. ZEITSCHRIFT FÜR PFLANZENKRANKHEITEN UND PFLANZENSCHUTZ, 81. pp. 389-393. ISSN 0340-8159

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Abstract

The application of Ethrel (2-chloroethylphosphonic acid) to plants can be used to regulate a number of physiological processes and may have practical or commercia l value. It has been used as an ethylene producing agent in plant physiology. Its use a plant regulator was first described by WARNER and LEOPOLD (1969). The mechanism for the formation of ethylene from Ethrel has been studied. Most of the Ethrel applied to plants is eventually converted into ethylene. The release of ethylene appears to be a simple base-catalyzed reaction and does not involve any enzymatic activity in the plant (LOUGHEED and FRANKLIN 1970). Treatment of tobacco with Ethrel caused mature leaves to lose their green color and turn yellow. Tobacco leaves treated during the curing process can probably be subjected to shorter yellowing periods than the untreated leaves (STEFFENS et al. 1970). Therefore, Ethrel can be used to hasten senescence. It has been reported that an increased rate of senescence of tobacco leaves also increased susceptibility to tobacco mosaic virus (TMV) (KIRALY et al. 1968). Similar results have been reported with inoculated leaves after their excision (NAKAGAKI and MATSUI 1971) and after treatment with actinomycin D (LOEBENSTEIN et al. 1969, MUKHERJEE et al. 1967), chloramphenicol (KIRALY et al. 1968; SELA et al. 1969), ethylene (BALAZS et al. 1969; NAKAGAKI et al. 1970; GABORJANYI et al. 1971), Ethrel (CHEO 1971) and abscisic acid (BALAZS et al. 1973). This study was made to determine the effects on tobacco leaf susceptibility to TMV after the Ethrel treatment of the leaves.

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