Abstract
Main conclusion
Transcriptome analysis and biochemical characterization of the putative l-3,4-dihydroxyphenylalanine (l-DOPA) pathway in Mucuna pruriens (L.) DC have been performed. Spatio-temporal quantification of the putative l-DOPA biosynthetic pathway genes and its correlation with respective metabolites was established. l-tyrosine, l-DOPA, and dopamine from all plant parts were quantified.
The de novo transcriptome analysis was performed using leaves of the selected M. pruriens mutant T-IV-9 during maturity. The putative l-DOPA pathway and its regulatory genes were retrieved from transcriptome data and the l-DOPA pathway was biochemically characterized. The spatial and temporal gene expression for the l-DOPA pathway was identified with respect to the chemical constituents. l-tyrosine, l-DOPA, and dopamine contents were highest in leaves during maturity (about 170-day-old plants). The polyphenol oxidase (PPO) was highly expressed in tender stems (230-fold higher as compared to seeds) as well as a high l-DOPA content. The PPO gene was highly expressed in leaves (3367.93 in FPKM) with a 79-fold increase compared to control plants during maturity. l-DOPA was found in every part with varied levels. The highest l-DOPA content was found in mature dried seed (3.18–5.8%), whereas the lowest amount was recorded in mature and dried leaves. The reproductive parts of the plant had a higher amount of l-DOPA content (0.9–5.8%) compared to the vegetative parts (0.2–0.91%). Various amino acid transporters and permeases were expressed in M. pruriens. The transcripts of dopa decarboxylase (DDC) were found in almost all parts of the plant, but its higher content was limited to the leaf.
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Abbreviations
- AD:
-
Arogenate dehydrogenase
- DDC:
-
Dopa/tyrosine decarboxylase
- L-DOPA:
-
l-3, 4-dihydroxyphenylalanine
- PPO:
-
Polyphenol oxidase
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Acknowledgements
We gratefully acknowledge the support and facilities provided by the Director CSIR-CIMAP Lucknow, India and senior research fellowship to the first author from ICMR (Indian Council Medical Research), New Delhi, India. The funding for this work was acknowledged from AGTEC (BSC0110- a CSIR network programme). We are highly thankful to Dr. M.M. Gupta for his kind support.
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Singh, S.K., Dhawan, S.S., Lal, R.K. et al. Biochemical characterization and spatio-temporal analysis of the putative l-DOPA pathway in Mucuna pruriens. Planta 248, 1277–1287 (2018). https://doi.org/10.1007/s00425-018-2978-7
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DOI: https://doi.org/10.1007/s00425-018-2978-7