[ Objective ] The research aimed to study the mechanism of cold resistance for P. Vaginatum Swartz. [ Method ] Paspalum vagina-tum Swartz was treated in low temperature (15,10,5℃) and room temperature (25 ℃). Choosing 6 large warm - season turf grasses as control , study on the cold hardiness and mechanism of cold resistance for Paspalum vaginatum Swartz was made, by means of determination of the physical indicators: soluble sugar ( SS) , proline ( Pro) , malondialdehyde ( MDA) , chlorophyll ( Chl) and electrical conductivity ( EC ) of leaves. [ Result ] The results showed that the cold hardiness of Paspalum vaginatum Swartz was strong and grew vigorously, the change of cold hardiness physiology was little in Paspalum vaginatum Swartz at the appropriate low temperature (10 ℃ or so). But it died suddenly at extreme low temperature (5 ℃ or so). The material ( such as proline and soluble sugar ) of the cold hardiness in Paspalum vaginatum Swartz increased too little at low temperature. [Conclusion] The cold resistance of Paspalum vaginatum Swartz may be affected by a small number of the main genes. The effects of the mutation breeding may be good.%[目的]研究海滨雀稗(Paspalum vaginatum Swartz)的抗寒机理.[方法]对海滨雀稗进行低温处理(15、10、5 ℃),以常温(25 ℃)为对照;以6个暖季型草坪草种作对照,通过测定各草种叶片内的可溶性糖、脯氨酸、丙二醛、叶绿素和电导率等生理指标,进行海滨雀稗的抗寒性和抗寒机理研究.[结果]海滨雀稗在适当低温(10℃左右)时的抗寒力强,生长旺盛,各抗寒生理指标变化小;但极度低温(5℃左右)时骤然死亡.原因是低温时抗寒物质(如脯氨酸和可溶性糖)增量少.[结论]海滨雀稗的抗寒性可能受少数几个主基因控制,诱变育种的效果可能较好.
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