高温胁迫对草地早熟禾某些生理指标的影响

Effects of High Temperature Stress on Some Physiological Indexes in Seedling of Kentucky Bluegrass

探明高温胁迫对冷季型草坪草伤害的生理机制,为采取防御措施提供科学依据。该研究以冷季型草坪草草地早熟禾(Poa pratenstsL.cv.Total eclipse)幼苗为材料,探讨了高温胁迫下其植株中有关生理指标的变化。结果表明:在(42.0?.5)℃高温胁迫下,幼苗植株质膜透性和膜脂过氧化产物丙二醛(MDA)含量显著增加,超氧物歧化酶(SOD)活性和可溶性蛋白质及还原型谷胱甘肽(GSH)含量明显降低;而可溶性糖、脯氨酸和抗坏血酸(AsA)含量在高温胁迫2 d时都有所增加,其后则都明显降低。因此高温致使冷季型草坪草幼苗植株质膜透性、MDA含量的显著增加和SOD活性、可溶性蛋白质、GSH、可溶性糖、脯氨酸、AsA含量的明显降低,是高温导致冷季型草坪草草地早熟禾热伤害的主要生理机制。

In order to explore the physiological mechanism of high temperature injury to cool-season turfgrass,the effects of high temperature（42.0 0.5） ℃on some physiological indexes in seedling of Total Eclipse（Poa pratensts L.）were studied.The results showed that electrolyte leakage and malondialdehyde（MDA） contents in seedling were higher significantly under high temperature stress than those in the control group during high temperature stress.In the meanwhile the activities of superoxide dismutase（SOD）,contents of soluble protein and glutathione（GSH）were lower significantly under the high temperature stress than those in the control group during high temperature stress.The contents of soluble sugar,proline and ascorbic acid（AsA）were increased slightly at 2 d under the high temperature stress,but the contents were lower significantly afterwards than those in the control group.Therefore,it is proposed that the significant increase of the electrolyte leakage and MDA contents and significant decrease of the SOD activities and the contents of soluble protein,GSH,soluble sugar,proline and AsA were physiological mechanism of high temperature injury to cool-season turfgrass.