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Journal of Experimental Botany, Vol. 54, No. 384, pp. 1113-1114, March 1, 2003
© 2003 Oxford University Press

Ubiquitous expression of a gene encoding for uncoupling protein isolated from the thermogenic inflorescence of the dead horse arum Helicodiceros muscivorus

Received 26 August 2002; Accepted 9 December 2002

Kikukatsu Ito4,2, Yukie Abe2, Sonya D. Johnston3 and Roger S. Seymour3

2 Cryobiosystem Research Center, Faculty of Agriculture, Iwate University, Iwate 020-8550, Japan
3 Department of Environmental Biology, University of Adelaide, Adelaide 5005, Australia

1 The nucleotide sequence data reported was deposited in DDBJ under the accession number AB088762.
4 To whom correspondence should be addressed. Fax: +81 19 621 6253. E-mail: kikuito{at}iwate-u.ac.jp

Uncoupling proteins (UCPs) are a family of mitochondrial inner membrane proteins that have been implicated in heat production in mammalian cells. The inflorescences of several members of the arum lily family (Araceae) have also been shown to produce heat during flowering, but the involvement of UCP-mediated heat production in plants is not known. In this work a gene has been isolated termed HmUCPa that encodes for a putative uncoupling protein from Helicodiceros muscivorus, a highly thermogenic arum lily. RT-PCR analysis revealed that the expression of HmUCPa was ubiquitously found, both in thermogenic male florets and appendix, and the non-thermogenic female florets, spathe and club-shaped organs of the spadix. These results suggest that HmUCPa is not primarily involved in organ-specific heat production in H. muscivorus.

Key words: Arum lily, heat production, Helicodiceros muscivorus, mitochondria, uncoupling protein (UCP).


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