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Effects of Drought Stress Simulated by PEG 6000 on Physiological Characteristics of Polygonatum odoratum

Yue Hua,Sun Shanshan,Li Yuzhu(School of Landscape Architecture,Northeast Forestry University,Harbin 150040,P.R.China)  
An experiment was conducted to study the effects of drought stress on five physiological characteristics of Polygonatum odoratum treated with different mass concentrations(10%,20%,and 30%) of Polyethylene glycol 6000(PEG6000) hypertonic solution in order to evaluate its drought resistance.Results showed that the ornamental value of P.odoratum disappeared gradually after 42 and 35 hours of stress by 20% and 30% PEG,respectively.With PEG concentration increasing and stress time prolonging,the leaf relative water content continued to decline,and then increased by 5%-10% after rewatering.There was a highly significant positive correlation between the electrical conductivity and the level of stress,and the electrical conductivity of P.odoratum stressed by 30% PEG could not resume after rewatering.Chlorophyll a content increased and chlorophyll b content declined after 14 hours of stress.Superoxide dismutase(SOD) activity increased significantly after 21 hours of stress by 10% and 20% PEG,with a peak value at 35 h after stress.It shows that the protective enzyme system of P.odoratum can resist drought stress by scavenging reactive oxygen free radicals.P.odoratum has a strong ability to resist drought stress,and it is able to adapt to 28-35 hours of stress by 20% and 30% PEG through self-regulation.
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