Abstract
Velvetbean (Mucuna pruriens) plants impede the growth of neighboring plants. One compound, 3-(3′,4′-dihydroxyphenyl)-l-alanine (l-DOPA), is responsible for the allelopathic capacity of velvetbean. This compound is an active allelochemical that decreases root growth of several plant species. In mammals, l-DOPA is a well-known therapeutic agent for the symptomatic relief of Parkinson’s disease. However, its mode of action in plants is still not well understood. To address such issues, gene expression in Arabidopsis thaliana plants, which had been exposed to l-DOPA, was analyzed using DNA microarrays. After 6 h of l-DOPA exposure, the expression of 110 genes was significantly upregulated, and the expression of 69 genes was significantly downregulated. These induced genes can be divided into different functional categories, mainly on the basis of subcellular localization, metabolism, and proteins with a binding function or cofactor requirement. Based on these results, we suggest that l-DOPA acts by two mechanisms: it influences amino acid metabolism and deregulates metal homeostasis, especially that of iron, which is required for the fundamental biological processes of all organisms.
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Abbreviations
- ASP2:
-
Aspartate aminotransferase
- bHLH:
-
Basic helix-loop-helix
- EMB2454:
-
Embryo defective, zinc ion binding
- FER:
-
Ferritin
- FRO:
-
Ferric reduction oxidase
- l-DOPA:
-
3-(3′,4′-Dihydroxyphenyl)-l-alanine
- NADP+ :
-
Nicotinamide adenine dinucleotide phosphate
- NRAMP:
-
Natural resistance-associated macrophage protein
- OPT:
-
Oligopeptide transporter
- PAL:
-
Phenylalanine ammonia-lyase
- POD:
-
Peroxidase
- ZIF:
-
Zinc induced facilitator
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Acknowledgments
This work was partially supported by the Japanese Society of Promotion of Science (JSPS fellowship award to Anna Golisz, Id. No. P 05643) and by the projects as follows: Research and Development Program for Resolving Critical Issues (project title, “Risk assessment of alien plants and their control in the field”), and by the Bio-oriented Technology Research Advancement Institution (BRAIN), Promotion of Basic Research Activities for Innovative Biosciences (project title, “Screening of allelochemicals and development of innovative bioactive substances”).
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Golisz, A., Sugano, M., Hiradate, S. et al. Microarray analysis of Arabidopsis plants in response to allelochemical l-DOPA. Planta 233, 231–240 (2011). https://doi.org/10.1007/s00425-010-1294-7
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DOI: https://doi.org/10.1007/s00425-010-1294-7