Plant Physiol. Illumina
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In Vivo Ubiquinone Reduction Levels during Thermogenesis in Araceae1

Anneke M. Wagner*, Marijke J. Wagner, and Anthony L. Moore

Department of Molecular Cell Physiology, Vrije Universiteit, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands (A.M.W., M.J.W.); and Department of Biochemistry, University of Sussex, Falmer, Brighton BN1 9QG, United Kingdom (A.L.M.)

In vivo ubiquinone (UQ) reduction levels were measured during the development of the inflorescences of Arum maculatum and Amorphophallus krausei. Thermogenesis in A. maculatum spadices appeared not to be confined to a single developmental stage, but occurred during various stages. The UQ pool in both A. maculatum and A. krausei appendices was approximately 90% reduced during thermogenesis. Respiratory characteristics of isolated appendix mitochondria did not change in the period around thermogenesis. Apparently, synthesis of the required enzyme capacity is regulated via a coarse control upon which a fine control of metabolism that regulates the onset of thermogenesis is imposed.

1   The work described in this paper was supported in part by a grant from the British Council and the Netherlands Organization for Scientific Research.
*   Corresponding author; e-mail amwagner{at}bio.vu.nl; fax 31-20-444-7229.

Plant Physiol. (1998) 117: 1501-1506
Copyright Clearance Center:   0032-0889/98/117//06
© 1998 American Society of Plant Physiologists




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