Abstract
Pulse labelling experiments with 35SO4 2- fed for 24h to intact plants (shooted onion sets)of Allium cepa (onion) showed that >70% of the label appeared in the S-alkenyl-L-cysteine sulphoxides within 18h, reached a maximum at 48h and thereafter decreased. The amount of label detected in the γ-glutamyl peptide fractions was below 20% of the total label at any time. It is concluded that in intact plants (at the growth stage used) the γ-glutamyl peptides are not the immediate precursors of the S-alkenyl-L-cysteine sulphoxides. The major S-alkenyl-L-cysteine sulphoxide in onion was found to be compartmentalized mainly within the endoplasmatic reticulum.
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Abbreviations
- AllCysSO:
-
(+)-S-2-propenyl-L-cysteine sulphoxide
- MeCysSO:
-
(+)-S-methyl-L-cysteine sulphoxide
- PrenCysSO:
-
trans-(+)-S-1-propenyl-L-cysteine sulphoxide
- ProCysSO:
-
(+)-S-propyl-L-cysteine sulphoxide
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Edwards, S.J., Britton, G. & Collin, H.A. The biosynthetic pathway of the S-alk(en)yl-L-cysteine sulphoxides (flavour precursors) in species of Allium . Plant Cell Tiss Organ Cult 38, 181–188 (1994). https://doi.org/10.1007/BF00033876
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DOI: https://doi.org/10.1007/BF00033876