Plant Physiol. Drug Metab Dispos
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Parallel Changes in H2O2 and Catalase during Thermotolerance Induced by Salicylic Acid or Heat Acclimation in Mustard Seedlings1

James F. Dat, Humberto Lopez-Delgado2, Christine H. Foyer, and Ian M. Scott*

Institute of Biological Sciences, University of Wales, Aberystwyth, Ceredigion SY23 3DA, United Kingdom (J.F.D., H.L.-D., I.M.S.); and Environmental Biology Department, Institute of Grassland and Environmental Research, Aberystwyth, Ceredigion SY23 3EB, United Kingdom (J.F.D., C.H.F.)

Spraying mustard (Sinapis alba L.) seedlings with salicylic acid (SA) solutions between 10 and 500 µm significantly improved their tolerance to a subsequent heat shock at 55°C for 1.5 h. The effects of SA were concentration dependent, with higher concentrations failing to induce thermotolerance. The time course of thermotolerance induced by 100 µm SA was similar to that obtained with seedlings acclimated at 45°C for 1 h. We examined the hypothesis that induced thermotolerance involved H2O2. Heat shock at 55°C caused a significant increase in endogenous H2O2 and reduced catalase activity. A peak in H2O2 content was observed within 5 min of either SA treatment or transfer to the 45°C acclimation temperature. Between 2 and 3 h after SA treatment or heat acclimation, both H2O2 and catalase activity significantly decreased below control levels. The lowered H2O2 content and catalase activity occurred in the period of maximum thermoprotection. It is suggested that thermoprotection obtained either by spraying SA or by heat acclimation may be achieved by a common signal transduction pathway involving an early increase in H2O2.

1   H.L.-D. was financially supported by the Consejo Nacional de Ciencia y Tecnologia, the Instituto Nacional de Investigaciones Forestales y Agropecuarias, and the British Council.
2   Permanent address: Programa de Papa, Instituto Nacional de Investigaciones Forestales y Agropecuarias, Metepec, Mex. 52142, A.P. 1-2, Mexico.
*   Corresponding author; e-mail ias{at}aber.ac.uk; fax 44-1-970-622350.

Plant Physiol. (1998) 116: 1351-1357
Copyright Clearance Center:   0032-0889/98/116/1351/07
© 1998 American Society of Plant Physiologists




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