The Effects Of Photosynthetic Physiology And Water Metabolism Of Kentucky Bluegrass Under Drought Stress

This research is in the Northeast Agricultural University Horticulture Station greenhouse,2introduce Kentucky Bluegrass Cultivars of the United States:Kenblue (Kenblue),Midnight (Midnight) and1native Heilongjiang Bluegrass (Blacktiger) as the tested material, by drought stress and re-water method, discusses the effects of drought stress on different bluegrass photosynthesis and water metabolism, designed for dry conditions selection of drought resistant varieties of Poa pratensis L. and provide a theoretical basis. The main results are as follows:Soil relative water content, leaf relative water content, soluble starch content, stomatal conductance of3bluegrass were aggravated with drought stress drop. To sixteenth days of drought stress, the relative water content of leaves, soluble starch content and stomatal conductance to decline as:Kenblue> local> Midnight, while the relative soil water content decreased as:Midnight> local> Kenblue.3varieties of evapotranspiration and the soluble sugar content with the drought stress time increasing, to drought stress of sixteenth days, evapotranspiration variation:Kenblue> local> Midnight, while the variation of soluble sugar content:Midnight> local> Kenblue. In addition to Midnight in drought for fourth days increased,3varieties of water use efficiency with drought stress aggravated decreased to sixteenth days, drought, water use efficiency decreased as:Kenblue> local> Midnight.After drought, the chlorophyll content, transpiration rate, intercellular CO2concentration and biomass with drought stress aggravates gradually, increased first and then decreased, to arid in sixteenth days, the content of chlorophyll and intercellular CO2concentration changes:Midnight> local> Kenblue, and biomass and transpiration rate of change:Kenblue> local> Midnight.Based on the above,3of drought resistant varieties of order:Midnight> local> Kenblue.