Effects of Drought Stress Simulated by PEG-6000 on Physiological Characteristics of Syneilesis aconitifolia(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Title:: Effects of Drought Stress Simulated by PEG-6000 on Physiological Characteristics of Syneilesis aconitifolia

Author(s):: YUE Hua; SHI Xi-mei; College of Landscape Architecture，Northeast Forestry University，Harbin，Heilongjiang 150040

Keywords:: Syneilesis aconitifolia; PEG-6000; drought stress; physiological indices

Abstract:: Taking Syneilesis aconitifolia transplanted from arid grassland habitats of Daqing as test materials，the influence of different mass concentrations (10%,20% and 30%) of PEG-6000 osmotic stress on S.aconitifolia’s forms，leaf relative water content，membrane permeability and superoxide dismutase (SOD) activity under the condition of indoor simulation drought were studied in order to evaluate its drought resistance．The results showed that its forms were subject to varying damage after 40 h of the mass concentration of 10%，20% and 30% PEG6000 stress，the ornamental value of S.aconitifolia began to disappeared gradually after 24 h and 16 h of PEG6000 stress by 20% and 30% PEG-6000，respectively．With the concentration of PEG6000 increasing and the time of stress prolonging，the leaf relative water content continued to decline，and then increased by 7%~10% after rewatering．It existed a very significant positive correlation between the membrane permeability and the level of stress，and then increased by 3%~7% after rewatering．The maximum value of SOD activity appeared at 32 h,16 h and 24 h of stress by 10%，20% and 30% PEG-6000，respectively，it showed that the protective enzyme system of S.aconitifolia could effectively remove uperoxides to resist the drought stress under drought stress damage.

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Last Update: 2014-08-16