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The effect of spermidine, spermine and putrescine analogues on the uptake and adsorption of putrescine by the lichen Evernia prunastri

AuthorsEscribano, M. Isabel ; Balaña-Fouce, Rafael; Legaz, M. E.
Issue Date1994
CitationPlant Physiology and Biochemistry 32: 55- 63 (1994)
AbstractCompetition for putrescine uptake among polyamines and between polyamines and their analogues has been studied in thalli of the lichen Evernia prunastri. Uptake experiments included measurements of both transport and adsorption of putrescine. Spermidine and spermine behaved as competitive inhibitors of putrescine transport, with K-i values of 1.55 mM and 1.34 mM, respectively. Basic amino acids, such as arginine, ornithine and lysine did not seem to compete for the same site of transport. Furthermore, putrescine uptake was slowly enhanced by Na+, K+, Ca-2+ and Mg-2+, and diminished by Mn-2+, Ni-2+ and La-3+. About 64% of putrescine taken up by lichen thalli was located in mycobiont cells. No metabolism of putrescine to other polyamines, such as spermidine and spermine, occurred after its uptake.
Identifiersissn: 0981-9428
Appears in Collections:(IF) Artículos
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