Physiological Evaluation of Seven Roegneria Species to Drought Stress at Seedling Stage

The physiological and biochemical characteristics of 7 Roegneria plants to drought resistance were studied with potted plant at seedling stage under successive drought stress to simulate soil drought condition,and their drought-resistances were evaluated comprehensively to select cultivar of drought resistance.The results showed that with the days of drought stress increased,soil relative volumetric water content,leaf relative water content and chlorophyll content were significantly decreased(P 0.05),proline content,cell membrane permeability and malondialdehyde content were significantly increased(P 0.05),POD activity and SOD activity increased at prophase and then varied among different materials.Correlation analysis showed that there were significant or highly significant correlations among indicators in addition to SOD activity.The drought resistance of 7 plants were comprehensively evaluated with subordinate function,their drought-resistance order was R.melanthera R.nutans R.stricta R.ciliaris R.varla R.dura R.turczaninorii var.turczaninovii.