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Effect of CO 2 Laser Radiation on Physiological Tolerance of Wheat Seedlings Exposed to Chilling Stress
Author(s) -
Chen YiPing,
Jia JingFen,
Yue Ming
Publication year - 2010
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2010.00723.x
Subject(s) - malondialdehyde , catalase , superoxide dismutase , nitric oxide , chemistry , glutathione , peroxidase , antioxidant , horticulture , glutathione peroxidase , botany , biochemistry , biology , enzyme , organic chemistry
To determine the effect of CO 2 laser pretreatment of wheat seeds on the physiological tolerance of seedlings to chilling stress, wheat seeds were exposed to CO 2 laser radiation for 300 s. After being cultivated for 48 h at 25°C, the wheat seedlings were subjected to chilling stress for 24 h. Selected physiological and biochemical parameters were measured in 6‐day‐old seedlings. We observed that chilling stress enhanced the concentrations of malondialdehyde and oxidized glutathione while decreasing the activities of nitric oxide synthase, catalase, peroxidase, superoxide dismutase and the concentrations of nitric oxide and glutathione in the wheat leaves compared with controls. When the chilling stress was preceded by CO 2 laser irradiation, the concentrations of malondialdehyde and oxidized glutathione were decreased while the activities of nitric oxide synthase, catalase, peroxidase, superoxide dismutase and the concentrations of nitric oxide and glutathione increased. Furthermore, chilling stress decreased the biomass, biophoton intensity and GHS/GSSG ratios of seedlings while these parameters increased when the seedlings were treated with CO 2 laser irradiation prior to the chilling stress. The results suggest that a suitable dose of CO 2 laser stimulation can enhance the physiological tolerance of wheat seedlings to chilling stress.