Abstract
In plants, extracellular matrix polymers built from polysaccharides and cuticular lipids have structural and protective functions. The cuticle is found to be ten times thinner in Arabidopsis thaliana (L.) Heynh than in many other plants, and there is evidence that it is unusual in having a high content of α-,ω-dicarboxylic fatty acids (FAs) in its polyesters. We designated the new organ fusion mutant hth-12 after it appeared to be allelic to adhesion of calyx edges (ace) and hothead (hth), upon molecular cloning of the gene by transposon tagging. This mutant is deficient in its ability to oxidize long-chain ω-hydroxy FAs to ω-oxo FAs, which results in leaf polyesters in decreased α-,ω-dicarboxylic FAs and increased ω-hydroxy FAs. These chemical phenotypes lead to disorder of the cuticle membrane structure in hth-12. ACE/HTH is a single-domain protein showing sequence similarity to long-chain FA ω-alcohol dehydrogenases from Candida species, and we hypothesize that it may catalyze the next step after cytochrome P450 FA ω-hydroxylases in the ω-oxidation pathway. We show that ACE/HTH is specifically expressed in epidermal cells. It appears very likely therefore that the changes in the amount of α-,ω-dicarboxylic FAs in hth-12 reflect the different composition of cuticular polyesters. The ACE/HTH gene is also expressed in root epidermal cells which do not form a polyester membrane on the exterior surface, thereby making it possible that the end products of the pathway, α-,ω-dicarboxylic FAs, are generally required for the cross-linking that ensures the integrity of the outer epidermal cell wall.
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Abbreviations
- GC–MS:
-
Gas chromatography–mass spectrometry
- RT-PCR:
-
Reverse transcription-polymerase chain reaction
- SEM:
-
Scanning electron microscopy
- TEM:
-
Transmission electron microscopy
- WT:
-
Wild type
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Acknowledgments
Sergey Kurdyukov and Andrea Faust contributed equally to this work. We thank Elmon Schmelzer and Rolf-Dieter Hirtz for helping us with microscopy, Aldona Ratajek-Kuhn for taking care of our plants, and RIKEN for providing cDNA clones for our study. We especially appreciate the criticisms of the manuscript made by Paul Hardy, Paul Schulze-Lefert, Michel Caboche, Christiane Nawrath, and Seth Davis. This work has been supported by a MPG fellowship to S.K., a DFG research grant to L.S., and a Bayer CropScience grant to A.Y.
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Kurdyukov, S., Faust, A., Trenkamp, S. et al. Genetic and biochemical evidence for involvement of HOTHEAD in the biosynthesis of long-chain α-,ω-dicarboxylic fatty acids and formation of extracellular matrix. Planta 224, 315–329 (2006). https://doi.org/10.1007/s00425-005-0215-7
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DOI: https://doi.org/10.1007/s00425-005-0215-7