Antioxidant Protection System and Photosynthetic Pigment Composition in Secale cereale Subjected to Short-Term Temperature Stresses

Introduction: Plants are often exposed to short-term temperature stresses (average 2-4 hours) or “temperature drops”. It is in the first hours of stress (alarm phase response) that metabolic changes occur, which go on contribute formation primary stress-induced response. Materials and Methods: Winter rye Secale cereale L. ‘Boguslavka’ plants were grown under controlled conditions a vegetation chamber. Fourteen-day-old heat (+40°C, 2 h) cold (+4°C, studied. The dynamics distribution free amino acids (AAs), total phenols (TPHs), flavonoids (TFs), as well content photosynthetic pigments, all determined according standard procedures. Results: Accumulation secondary metabolites organs winter depended type temperature, stress, plant organ. In alarm cold-resistant after increased accumulation AAs (GABA, Pro, Asp, Cys, Val) decreased chlorophyll. Both types inhibited TPHs, this effect was more pronounced stress. Conclusion: Quantitative qualitative low molecular weight protectors indicated TPHs involved response both plants. ability accumulate roots considered one prerequisites for resistance. apparatus susceptible stressors response, by significantly pigment.