title: Intracellular Compartmentation of ATP in Dormant and Non-dormant Tubers of Jerusalem artichoke (Helianthus tuberosus L.) grown in vitro.
abstract: Treatment with fusicoccin of fragments of parenchyma of tubers of Jerusalem artichoke (Helianthus tuberosus L.) grown in vitro, leads to a fall in ATP concentration in dormant material but not in non-dormant material. Initial rate of poly-L-lysine-induced ATP efflux from the parenchyma is greater in dormant material than in non-dormant material, though overall concentrations vary in the opposite way. In dormant material, initial ATP efflux is reduced by fusicoccin and increased by vanadate. Rapid fractionation of protoplasts from parenchyma shows a cytosolic A TP proportion of 95% in dormant material and of 70% in non-dormant material. The rôle of compartmentation of A TP in relation to the function of plasmalemma A TPase, regulation of nucleotide pools and dormancy is discussed.
authors.affiliation: Laboratoire de Phytomorphogenèse associé au C.N.R.S. (U.A. 45), Université de Clermont II, 4, rue Ledru, 63038 Clermont-Ferrand Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Gendraud
authors.forename: J
authors.initials: J
authors.lastname: Lafleuriel