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Effect of calcium on sulfate uptake by barley roots
Author(s) -
SKJELBREID EGIL,
NISSEN PER
Publication year - 1980
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.1399-3054.1980.tb03321.x
Subject(s) - hordeum vulgare , calcium , sulfate , chemistry , biochemistry , hordeum , biophysics , poaceae , botany , biology , organic chemistry
Sulfate uptake by excised roots of barley ( Hordeum vulgare L.) was maximal in the presence of about 3x10 ‐3 M CaCl 2 . Kinetic studies contraindicate a stoichiometric binding of calcium to the carrier for sulfate, in contrast to findings of Cuppoletti and Segel (Biochemistry 14: 471–4718, 1975) for the filamentous fungus Penicillium notatum . In barley, calcium affects the K m but not the V max for sulfate uptake, presumably by altering the conformation and, thereby, the affinity of the carrier. Calcium also affects the transition site for sulfate uptake.