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Research Article Open access CC BY 4.0

Evidence for the Role of Salicylic Acid in Thermoregulation in Sporophylls of Male Cones of Six Cycad Species

Hanna Skubatz, Michael Calonje, William Tang

Asian Journal of Research in Botany · pp. 287–294 · Published 31 Dec 2022

Abstract

The objective of this research was to provide a framework for the study of induction of thermogenesis by aspirin, salicylic acid, and 2,6-dihydroxybenzoic acid in detached sporophylls from male cones of six cycad species. The thermogenic species were: Zamia elegantissima Schutzman, Vovides & R. S. Adams; Z. furfuracea L.f.; Z. pseudomonticola L.D.Gómez ex D.W.Stev. & Sabato; Z. skinneri Warsz; Encephalartos hildebrandtii A. Braun & C. D. Bouché; and Cycas siamensis Miq. Temperature of single sporophylls was measured for 48 h using thermocouples in the absence and presence of inducers. Sporophylls treated with salicylic acid generated asymmetric temperature waves and square and sinusoidal temperature waves. Also a jump in temperature at a rate of ~ 1 ºC/h was detected in sporophylls treated with salicylic acid. A drop in temperature preceded the temperature jump to a new and higher steady-state level and it stayed unchanged. These unexpected thermal activities suggest cellular controls of mitochondrial thermoregulation.

Aspirin cycads 2,6-dihydroxybenzoic acid salicylic acid sporophyll

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