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JXB Advance Access published online on June 23, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erl008
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received March 7, 2006
Accepted March 30, 2006

RESEARCH PAPER

Up- and down-regulation of Fragariaxananassa O-methyltransferase: impacts on furanone and phenylpropanoid metabolism

Stefan Lunkenbein 1, Elma M. J. Salentijn 2, Heather A. Coiner 1, Marjan J. Boone 2, Frans A. Krens 2, and Wilfried Schwab 1 *

1 Technical University Muenchen, Biomolecular Food Technology, Lise-Meitner-Str. 34, D-85354 Freising, Germany
2 Plant Research International, Business Unit Genetics and Breeding, PO Box 16, 6700 AA Wageningen, The Netherlands

* To whom correspondence should be addressed.
Wilfried Schwab, E-mail: schwab{at}wzw.tum.de


  Abstract

A complex mixture of hundreds of substances determines strawberry (Fragariaxananassa) aroma, but only ~15 volatiles are considered as key flavour compounds. Of these, 4-hydroxy-2,5-dimethyl-3(2H)-furanone (HDMF) is regarded as the most important, but it is methylated further by FaOMT (Fragariaxananassa O-methyltransferase) to 2,5-dimethyl-4-methoxy-3(2H)-furanone (DMMF) during the ripening process. It is shown here that transformation of strawberry with the FaOMT sequence in sense and antisense orientation, under the control of the cauliflower mosaic virus 35S promoter, resulted in a near total loss of DMMF, whereas the levels of the other volatiles remained unchanged. FaOMT repression also affected the ratio of feruloyl 1-O-{beta}-D-glucose and caffeoyl 1-O-{beta}-D-glucose, indicating a dual function of the enzyme in planta. Thus, FaOMT is involved in at least two different biochemical pathways in ripe strawberry fruit.

Keywords: Fragariaxananassa; fruit ripening; O-methyltransferase; strawberry; volatiles.
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