Abstract
CYP94A1 is a cytochrome P450 (P450) catalyzing fatty acid (FA) ω-hydroxylation in Vicia sativa seedlings. To study the physiological role of this FA monooxygenase, we report here on its regulation at the transcriptional level (Northern blot). Transcripts of CYP94A1, as those of two other P450-dependent FA hydroxylases (CYP94A2 and CYP94A3) from V. sativa, are barely detectable during the early development of the seedlings. CYP94A1 transcripts, in contrast to those of the two other isoforms, are rapidly (less than 20 min) and strongly (more than 100 times) enhanced after treatment by clofibrate, an hypolipidemic drug in animals and an antiauxin (p-chlorophenoxyisobutyric acid) in plants, by auxins (2,4-dichlorophenoxyacetic acid and indole-3-acetic acid), by an inactive auxin analog (2,3-dichlorophenoxyacetic acid), and also by salicylic acid. All these compounds activate CYP94A1 transcription only at high concentrations (50–500 μM range). In parallel, these high levels of clofibrate and auxins modify seedling growth and development. Therefore, the expression of CYP94A1 under these conditions and the concomitant morphological and cytological modifications would suggest the implication of this P450 in a process of plant defense against chemical injury.
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Abbreviations
- 2,3-D:
-
2,3-Dichlorophenoxyacetic acid
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- FA:
-
Fatty acid
- GST:
-
Glutathione-S-transferase
- IAA:
-
Indole-3-acetic acid
- P450:
-
Cytochrome P450
- PCIB:
-
p-Chlorophenoxyisobutyric acid
- PMSF:
-
Phenylmethane sulfonylfluoride
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Acknowledgements
The authors acknowledge Ms. Marie-France Poulet for skilful technical assistance and Dr. Dawn Little for critical reading of the manuscript. We thank gratefully Dr. Bernard Grausem for effective computer assistance. We thank also Dr. Christiane Garaud (CNRS-IBMP-Strasbourg) for offering the opportunity for transmission electron microscopic investigations. We are indebted to Professor Félix Mauch (University of Fribourg, Switzerland) for the generous gift of an Arabidopsis GST6 cDNA clone. Financial support by the Centre National de la Recherche Scientifique is gratefully acknowledged.
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Benveniste, I., Bronner, R., Wang, Y. et al. CYP94A1, a plant cytochrome P450-catalyzing fatty acid ω-hydroxylase, is selectively induced by chemical stress in Vicia sativa seedlings. Planta 221, 881–890 (2005). https://doi.org/10.1007/s00425-005-1503-y
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DOI: https://doi.org/10.1007/s00425-005-1503-y