The Effects of Polyethylene Glycol on Physiological and Biochemical Characteristics of Corn Seedlings under Low Temperature Stress
[Objective] To investigate the mitigative effect of polyethylene glycol (PEG) on physiological and biochemical characteristics of corn seedlings under low temperature stress in lab.[Method] Firstly,the corns were potted at 28 ℃.At three-leaf stage,the corn seedlings were stressed by 8 ℃ low temperature for three days.At the same time,the leaf was sprayed by PEG (30％).After three days,the physiological and biochemical characteristics of corn seedlings were determined.[Result] When core seedlings were stressed by low temperature,the contents of malondialdehyde (MDA) and soluble sugar increased significantly (P ＜ 0.05),and the peroxidase (POD) activity also increased (P ＜ 0.05),but the content of chlorophyll decreased dramatically (P ＜ 0.05).After the above stressed corn seedlings were sprayed by PEG (30％),MDA content,soluble sugar content and POD activity decreased (P ＜0.05),and the chlorophyll content increased (P ＜0.05) comparing with low temperature control.All levels using PEG (30％) can reach or exceed the low temperature control.[Conclusion]PEG (30％) has mitigative effect on corn seedlings under low temperature stress.
Low temperature stressPolyethylene glycolCorn seedlingPhysiological and biochemical characteristicsMitigative effect
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