晋北乡土草种对低温胁迫的生理响应

Physiological Responses of Native Grass Species to Low Temperature Stress in Northern Shanxi

以山西省大同市广灵县甸顶草原的7个优势草种为对象,测定其在低温胁迫条件下的抗逆性生理指标。结果表明,在低温胁迫条件下,硬质早熟禾、羊草及赖草的SOD活性、POD活性、CAT活性较高,赖草、羊草、早熟禾和硬质早熟禾的可溶性蛋白含量较高,羊草、赖草和早熟禾的叶绿素含量较高,小红菊、薹草、赖草和羊草的MDA含量较低。通过比较各草种的7个抗性指标,发现羊草、赖草、硬质早熟禾的抗低温胁迫能力较强,可以作为晋北地区重点繁育的乡土草种。

7 dominant grass species from Dianding Grassland in Guangling County of Datong City in Shanxi Province were selected to determine their stress resistance physiological indicators under low temperature stress conditions.The results showed that under low temperature stress conditions,the SOD activity,POD activity and CAT activity of Poa sphondylodes,Leymus chinensis and Leymus secalinus were higher.The soluble protein content of Leymus secalinus,Leymus chinensis,Poa annua and Poa sphondylodes was higher.The chlorophyll content of Leymus chinensis,Leymus secalinus and Poa annua was higher.The MDA content of Chrysanthemum chanetii,Carex,Leymus secalinus and Leymus chinensis was lower.By comparing the 7 resistance indicators of various grass species,it was found that Leymus chinensis,Leymus secalinus and Poa sphondylodes had strong resistance to low temperature stress and could be used as key local grass species for breeding in northern Shanxi.