This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Web of Science (22) Citing Articles via Google Scholar Google Scholar Articles by Larrigaudière, C. Articles by Triantaphylidès, C. Search for Related Content PubMed PubMed Citation Articles by Larrigaudière, C. Articles by Triantaphylidès, C. Agricola Articles by Larrigaudière, C. Articles by Triantaphylidès, C.

Environmental and Stress Physiology

Short-Term Effects of -Irradiation on 1-Aminocyclopropane-1-Carboxylic Acid Metabolism in Early Climacteric Cherry Tomatoes ¹

Comparison with Wounding

CEN Cadarache, Département de Biologie, Service de Radioagronomie, F-13108 Saint Paul Lez Durance Cedex, France, Ecole Nationale Supérieure Agronomique, 145, Avenue de Muret, F-31076 Toulouse Cedex, France

-Irradiation of early climacteric (breaker) cherry tomatoes (Lycopersicon pimpinellifollium L.) caused a sharp burst in ethylene production during the first hour. The extent of ethylene production was dose dependent and was maximum at about 3 kilograys. The content of 1-aminocyclopropane-1-carboxylic acid (ACC), followed the same evolution as ethylene production, while malonyl ACC increased steadily with time in irradiated fruits. The burst in ethylene production was accompanied by a sharp stimulation of ACC synthase activity which began 15 minutes after irradiation. The stimulation was completely prevented by cycloheximide, but not by actinomycin D or cordycepin. In contrast with irradiation, mechanical wounding continuously stimulated ethylene production over several hours. -Irradiation and cordycepin applied to wounded tissues both caused the cessation of this continuous increase, but the initial burst was still persisting. These data suggest that -irradiation, like wounding, stimulates the translation of preexisting mRNAs. It also reduces, at least temporarily, the subsequent transcription-dependent stimulation of ethylene production. -Irradiation greatly inhibited the activity of ethylene-forming enzyme at doses higher than 1 kilogray. Such sensitivity is in accordance with a highly integrated membranebound enzyme.

This article has been cited by other articles:

				T. Nagata, S. Todoriki, and S. Kikuchi Radial Expansion of Root Cells and Elongation of Root Hairs of Arabidopsis thaliana Induced by Massive Doses of Gamma Irradiation Plant Cell Physiol., November 15, 2004; 45(11): 1557 - 1565. [Abstract] [Full Text] [PDF]