ISSN:
1573-5044
Keywords:
Allium cepa
;
biosynthesis
;
compartmentation
;
γ-glutamyl peptides
;
onion
;
protoplasts
;
S-alkenyl-L-cysteine sulphoxide
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00033876
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