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Changes in oxidation‐reduction state and antioxidant enzymes in the roots of jack pine seedlings during cold acclimation
Author(s) -
Zhao Sheyun,
Blumwald Eduardo
Publication year - 1998
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 - 10.1034/j.1399-3054.1998.1040117.x
Subject(s) - ascorbic acid , glutathione reductase , glutathione , antioxidant , peroxidase , biochemistry , chemistry , acclimatization , reductase , botany , cold hardening , glutathione peroxidase , horticulture , enzyme , food science , biology
The role of glutathione and the response of components of the ascorbic acid‐glutathione cycle in cold acclimation and the acquired freezing tolerance of jack pine ( Pinus banksiana Lamb.) seedlings were investigated. An increase in the reduced to oxidized glutathione mole ratio was correlated with the increase in root soluble and membrane‐bound protein thiol concentrations during cold acclimation and after a freeze and thaw event. All the enzymes involved in the ascorbic acid‐glutathione cycle were regulated by low temperatures and increased activities of ascorbic peroxidase, dehydroascorbate reductase, monodehydroascorbate reductase, and glutathione reductase were observed after the conditioning of the seedlings to low temperatures. Our results suggest that these enzymes play a protective role following the exposure of the seedlings to freezing temperatures.