Plant Physiol.
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Fusicoccin Counteracts the n-Ethylmaleimide and Silver-Induced Stimulation of Oxygen Uptake in Egeria densa Leaves1

Maria Teresa Marrè* and Francesco Albergoni

Centro di Studio del Consiglio Nazionale delle Richerche sulla Biologia Cellulare e Molecolare delle piante (M.T.M.), and Dipartimento di Biologia, Università di Milano (F.A.), via Celoria 26, 20133 Milano, Italy

It was previously shown that a number of sulfhydryl [SH] group reagents (N-ethylmaleimide [NEM], iodoacetate, Ag+, HgCl2, etc.) can induce a marked, transitory stimulation of O2 uptake (QO2) in Egeria densa leaves, insensitive to CN- and salicylhydroxamic acid and inhibited by diphenylene iodonium and quinacrine. The phytotoxin fusicoccin (FC) also induces a marked increase in O2 consumption in E. densa leaves, apparently independent of the recognized stimulating action on the H+-ATPase. In this investigation we compared the FC-induced increase in O2 consumption with those induced by NEM and Ag+, and we tested for a possible interaction between FC and the two SH blockers in the activation of QO2. The results show (a) the different nature of the FC- and NEM- or Ag+-induced increases of QO2; (b) that FC counteracts the NEM- (and Ag+)-induced respiratory burst; and (c) that FC strongly reduces the damaging effects on plasma membrane permeability observed in E. densa leaves treated with the two SH reagents. Two alternative models of interpretation of the action of FC, in activating a CN--sensitive respiratory pathway and in suppressing the SH blocker-induced respiratory burst, are proposed.

1   This work was supported by the Ministero Italiano dell' Università e della Ricerca Scientifica e Tecnologica (40%).
*   Corresponding author; e-mail teamarre{at}imiucca.unimi.it; fax 39-2-26-60-43-99.

Plant Physiol. (1998) 116: 681-686
Copyright Clearance Center:   0032-0889/98/116/0681/06
© 1998 American Society of Plant Physiologists




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M. T. Marrè, E. Amicucci, L. Zingarelli, F. Albergoni, and E. Marrè
The Respiratory Burst and Electrolyte Leakage Induced by Sulfhydryl Blockers in Egeria densa Leaves Are Associated with H2O2 Production and Are Dependent on Ca2+ Influx
Plant Physiology, December 1, 1998; 118(4): 1379 - 1387.
[Abstract] [Full Text]


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