高温胁迫对两种冷季型草坪草生理生化特性的影响

为研究高温胁迫对冷季型草坪草生理生化指标的影响,通过盆栽试验测定了昼夜(38/28℃)两种温度下两种冷季型草坪草的5种生理生化指标(质膜透性、脯氨酸含量、过氧化物酶(POD)活性、超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量)。结果表明:随着胁迫时间的延长,各品种叶片的相对电导率、丙二醛含量和游离脯氨酸含量均呈递增趋势,其增加幅度与胁迫时间呈正相关,胁迫后各指标相对于对照均有了显著的增加(P<0.05);过氧化物酶和超氧化物歧化酶活性则呈先上升后下降的趋势。高羊茅属3个品种的耐热性大于早熟禾属各品种的耐热性,其中高羊茅属的RebleⅣ和早熟禾属的Blue Sap-phire的耐热性优于种间其他品种。

Effects of high temperature stress on the physiological and biochemical characters of two types of cool-season turf grass

To understand the effects of high temperature stress on the physiological and biochemical characters of cool-season turf grass,a pot experiment with two turf grasses Festuca and Poa was conducted to study their plasma membrane permeability,proline and MDA contents,and POD and SOD activities at the day and night temperature 38/28 ℃.With the increasing time of the high temperature stress,the leaf relative conductivity and free proline and MDA contents of the grasses presented an increasing trend,being significantly higher(P<0.05) than the control on the 8th days after the stress,whereas the POD and SOD activities showed a trend of increasing first and decreased then.All the test varieties of Festuca arundinacea had better heat-resistance than those of Poa,and the Reble Ⅳ of F.arundinacea as well as the Blue Sapphire of Poa had the best heat-resistance.