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Mechanism of the inhibition of phloem loading by sodium sulfite: Effect of the pollutant on respiration, photosynthesis and energy charge in the leaf tissues
Author(s) -
Maurousset Laurence,
Raymond Philippe,
Caudillert Monique,
Bonnemain JeanLouis
Publication year - 1992
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.1399-3054.1992.tb08771.x
Subject(s) - photosynthesis , respiration , sulfite , sodium sulfite , pollutant , chemistry , sodium , energy charge , depolarization , biophysics , atpase , botany , environmental chemistry , biochemistry , biology , adenylate kinase , receptor , organic chemistry , enzyme
As in other materials, sodium sulfite (Na 2 SO 3 ) inhibited both respiration and photosynthesis in leaf tissues of broad‐bean L. cv. Aguadulce). Under our experimental conditions, photosynthesis was more sensitive (significant inhibition at 10 μM) to the pollutant than respiration (significant inhibition only for concentrations higher than 0.1 mM). Sulfite concentrations higher than 0.1 mM also caused the energy charge of leaf tissues to decline sharply. These results suggest that the long, term depolarization of the transmembrane potential difference noticed for concentrations of pollutant higher than 0.1 mM (Maurousset and Bonnemain, Physiol. Plant. 80: 233–237,1990) was mainly due to an indirect inhibition of the plasma membrane H + ‐ATPase activity following the decrease of the available level of ATP.