关键词: 金发草, 丛毛羊胡子草, 抗寒性, 质膜透性, 可溶性糖

Abstract: Using tow native petrophile plants(Pogonatherum paniceum and Eriophorum comosum) as research materials and bermudagrass(Cynodon dactylon) as a contrast which was one of the plants usually applied to the slope protection, the study was intended to determine the response of membrane permeability and soluble carbohydrate to low temperature stress. The results showed that the electrolyte osmotic rate and soluble carbohydrate content increased with the temperature decline. The Eriophorum comosum leaves had lower electrolyte osmotic rate and higher soluble carbohydrate content than those of Pogonatherum paniceum and Cynodon dactylon under every treated temperature. The semilethal temperature of Eriophorum comosum was also lower than that of Pogonatherum paniceum and Cynodon dactylon. Under the five treated temperature, the electrolyte osmotic rate of three grasses in August were higher than that in December, but the soluble carbohydrate content was opposite, which was lower in August than that in December. The results suggest that Eriophorum comosum has the strongest capacity of cold resistance among three plants, and the natural temperature decline is conducive to the induction and improvement of cold resistance.

Key words: Pogonatherum paniceum, Eriophorum comosum, cold resistance, membrane permeability, soluble carbohydrate