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Effects of NaCl on the carboxylating activity of Rubisco from Tamarix jordanis in the presence and absence of proline‐related compatible solutes
Author(s) -
Solomon A.,
Beer S.,
Waisel Y.,
Jones G. P.,
Paleg L. G.
Publication year - 1994
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.1399-3054.1994.tb02211.x
Subject(s) - rubisco , proline , carboxylation , pyruvate carboxylase , chemistry , oxygenase , tamarix , biochemistry , photosynthesis , botany , biology , enzyme , amino acid , catalysis
The effects of NaCl on the carboxylating activity of ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco) were investigated in the presence of two proline‐related analogues found in Tamarix jordanis . N‐methyl‐L‐proline ameliorated the inhibition of the activity of Rubisco by NaCl. Full amelioration was reached at 200 m M of this protectant. Protection by N‐methyl‐ trans ‐4‐hydroxy‐L‐proline was less effective. Significant differences in the Rubisco protein content from different populations of Tamarix jordanis were observed. Moreover, higher carboxylation rates were obtained for Rubisco preparations from plants that had been grown in saline media. These results are discussed with respect to the adaptation strategies of Tamarix jordanis to saline conditions.