费斯塔和高羊茅在重庆地区夏季干热条件下的适应性研究

Study on the adaptability of Festuca festina and F. arundinacea in hot and dry summer in Chongqing

以观赏草品种费斯塔Festuca festina和草坪草品种高羊茅F.arundinacea为材料,参照重庆市夏季的气候条件,对两者进行为期8d的高温、干旱双重胁迫的模拟越夏试验,并分析费斯塔和高羊茅在高温、干旱双胁迫条件下的形态变化、生理指标变化,结果表明:在干热胁迫条件下,高羊茅表观伤害症状反应比较迅速和明显,随着胁迫的进行,高羊茅的叶绿素含量下降更快,丙二醛含量更高,可溶性糖积累相对缓慢,从而说明费斯塔耐干热胁迫的能力优于高羊茅,比高羊茅具有更好的越夏适应性。

Festuca festina and F. arundinacea were used to test their adaptability under high tempera- ture and drought stress for 8 days in Chongqing. The result indicated that the response of F. arundinacea to the stress was more sensitive because of its obvious damaged symptoms. Along with the stress, the chlorophyll content rapidly reduced, the malondialdehyde content increased and the soluble sugar accumulation was relatively slow for F. arundinacea. It could be concluded that F. festina was better than F. arundinacea for hot and drought resistance in summer.