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JXB Advance Access originally published online on July 14, 2006
Journal of Experimental Botany 2006 57(11):2805-2814; doi:10.1093/jxb/erl045
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© 2006 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Analysis of the role of COMATOSE and peroxisomal beta-oxidation in the determination of germination potential in Arabidopsis

Steven Footitt1, Julietta Marquez3, Heike Schmuths3, Alison Baker2, Frederica L. Theodoulou1 and Michael Holdsworth3,*

1Crop Performance and Improvement Division, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK
2Centre for Plant Sciences, University of Leeds, Leeds LS2 9JT, UK
3Division of Agricultural and Environmental Sciences, School of Biosciences, University of Nottingham, Nottingham LE12 5RD, UK

*To whom correspondence should be addressed. E-mail: michael.holdsworth{at}nottingham.ac.uk

Comparative physiological analysis of mutant Arabidopsis seeds under defined environmental conditions was used to analyse the relative contributions of components of peroxisomal beta-oxidation in the control of seed germination potential. The COMATOSE (CTS) and KAT2 loci were shown to play essential roles in regulating germination and establishment potentials, whereas LACS6 and LACS7 loci only influenced establishment following germination. The viability and desiccation tolerance of three different mutant alleles of CTS were shown to be intermediate between that of dormant and non-dormant wild-type seeds. Analysis of ttg-1 cts-1 double mutant seeds demonstrated that the cts lesion did not influence after-ripening capacity. These data demonstrate the importance of peroxisomal beta-oxidation in the control of germination potential, but suggest that breakdown of stored lipid is not an important prerequisite for germination. A function is suggested for CTS following after-ripening within pathways related to the progression of germination prior to radicle emergence.

Key words: Arabidopsis, beta-oxidation, COMATOSE, gene expression, germination, peroxisome, physiological genetics


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