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5种冷地型草坪草离体叶片在骤然高温干旱（45℃不供水）条件下,细胞外渗液电导率极显著地高于在单因子高温（45℃供水）和单因子干旱（25℃不供水）条件下的电导率,后两者又极显著地高于对照条件（25℃供水）下的电导率。单因子高温和单因子干旱对细胞膜的伤害是显著的,高温和干旱的共同作用对细胞膜的伤害更大。夏季高温干旱应是造成冷地型草坪草在上海越夏困难的主要原因之一。供试材料在高温、干旱条件下,电导率最高的均为匍匐翦股颖Bent,细叶羊茅Southport,两者与其他材料间有显著差异,其次为多年生黑麦草新品系上农PRG—2和草地早熟禾Nassau,最低的为多年生黑麦草新品系上农PRG—1、高羊茅Houndog和草地早熟禾Wabash。电导率高的材料在田间的越夏表现也最差。不耐热的材料也不耐旱。本测试系统中的电导率可作为鉴定冷地型草坪草耐热、耐旱性的指标。
Under the condition of sudden high temperature and drought (no water supply at 45 ℃), the conductivity of extracellular effluent was significantly higher than that at single factor high temperature (45 ℃ water supply) and single factor drought (25 ℃ Not water), the latter two were significantly higher than those under control conditions (25 ° C water supply). Single factor high temperature and single factor drought damage to the cell membrane is significant, the combination of high temperature and drought damage to the cell membrane more. High temperature and drought in summer should be one of the main reasons for the cold summer turf in the summer in Shanghai. Under the conditions of high temperature and drought stress, the highest conductivity of the tested materials was creeping bentgrass Bent and Stems Southport, which had significant difference with other materials, followed by PRG-2 And Nassau, the lowest for the perennial ryegrass lines, upper PRG-1, tall fescue Houndog and meadow grass Wabash. Materials with high electrical conductivity also show the worst summer performance in the field. Heat-labile material is also not drought-tolerant. The conductivity of the test system can be used as an index to identify the cold-tolerant turfgrass heat tolerance, drought tolerance.