Adaptation, Physiological/genetics; Antioxidants/metabolism; Cold Temperature; Nicotiana/genetics; Stress, Physiological; Triticum/genetics; Ubiquitin/genetics; Cell Membrane/metabolism; Cloning, Molecular; Genes, Plant; Glucuronidase/genetics; Malondialdehyde/metabolism; Oxidative Stress; Photosynthesis; Photosystem II Protein Complex/metabolism; Plant Leaves; Plant Proteins/genetics; Plant Proteins/metabolism; Plants, Genetically Modified; Proline/metabolism; Reactive Oxygen Species/metabolism; Nicotiana/metabolism; Nicotiana/physiology; Triticum/metabolism; Triticum/physiology; Ubiquitin/metabolism; Water/physiology

APX; CAT; Chilling tolerance; E1; E2; E3; Fv/Fm; MDA; NBT; POD; Photosynthesis; Pn; ROS; Reactive oxygen species; SOD; T-GUS; Transgenic tobacco plants; UPS; Ub; Ub/26S proteasome system; Ubiquitin; WT; Wheat; actual efficiency of PSII; ascorbate peroxidase; catalase; malondialdehyde; maximal efficiency of PSII photochemistry; nitroblue tetrazolium; pBI-GUS; peroxidase; photosynthetic rate; reactive oxygen species; superoxide dismutase; the transgenic plants carrying the recombinant construct of GUS gene; ubiquitin; ubiquitin-activating enzyme; ubiquitin-conjugating enzyme; ubiquitin-protein ligase; vector control, carrying the recombinant construct of the ß-glucuronidase gene alone under the control of CaMV 35S promoter and the nopaline synthase 3' termination sequences in the sense orientation; wild-type; ФPSII