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Cysteine and Methionine Regulation of Sulfate Uptake in Potato Tuber Discs ( Solanum tuberosum )
Author(s) -
MAGGIONI ANGELO,
RENOSTO FRANCO
Publication year - 1977
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1977.tb04026.x
Subject(s) - methionine , cysteine , sulfate , amino acid , chemistry , solanum tuberosum , sulfur , biochemistry , cysteine metabolism , biology , botany , organic chemistry , enzyme
Sulfate uptake in potato tuber discs is inhibited by cysteine and methionine with an 8 h lag period. Cysteine, but not methionine, inhibition can be reversed by washing the treated discs. During the experimental period cysteine is rapidly metabolized, while methionine persists as a free amino acid. Amino acid inhibition of sulfate uptake is overcome by increasing sulfate concentration. The kinetic parameters change suggesting a loss of flexibility of the sulfate uptake system caused by sulfur amino acids.