[en] Rooting of wild-type tobacco (Nicotiana tabacum cv. Xanthi) shoots raised in vitro was promoted by polyamines in the absence of any other growth regulator and was inhibited by two inhibitors of polyamine metabolism. The auxin insensitive and recalcitrant to rooting rac mutant shoots did not respond to the same treatments. The activities of arginine decarboxylase (ADC), ornithine decarboxylase (ODC), diamine oxidase (DAO), polyamine oxidase (PAO) and transglutaminases (TGases), and the titres of free and conjugated polyamines were estimated in the whole shoots and the basal parts of the stems of both tobaccos in the course of multiplication in vitro. The rac shoots grew at a lower rate. The wild-type rooted from the 7th day without special treatment. During the second week of culture, the shoots of both tobaccos were actively growing and showed an increase in ADC, ODC, DAO, PAO and TGase activities. Afterwards all these activities declined. These changes were concomitant with an increase in the polyamine contents (free and conjugated). Biosynthesis and oxidation of polyamines apparently occurred simultaneously and seemed directly correlated. In the basal part of the mutant stems however, the accumulation of free and conjugated putrescine as well as the transient increase in biosynthetic enzyme activities were delayed compared to the wild-type. These results are discussed in relation to growth behaviour and to root formation. (C) 2000 Editions scientifiques et medicales Elsevier SAS.
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