以狗牙根属(Cynodon Rich.)的18个优良品种(选系)为试验材料,以我国草坪生产上广泛应用的普通狗牙根〔C. dactylon(L.)Pers.〕品种‘Common’和杂交狗牙根(C. dactylon×C. transvaalensis)品种‘Tifdwarf’与‘Tifway’为对照,用电解质渗透法进行了抗寒性的初步鉴定。结果表明:与对照‘Common’相比,除‘OKc95-1’的LT50与‘Common’接近,其他的普通狗牙根品种(选系)的LT50均低于对照,尤其是C174的LT50为-5.2℃,比对照低4.6℃;杂交狗牙根中,与‘Tifdwarf’和‘Tifway’相比,‘TifgreenⅡ’、‘TifwayⅡ’和‘Midfield’ 3品种的LT₅₀显著低于对照,其LT₅₀分别是-7.5℃、-8.8℃和-6.0℃,‘Tifeagle’、‘ Tifsport’和‘Tiflawn’的LT₅₀则都高于两个对照品种。

The low temperature tolerance of 18 variaties or accessions of Cynodon spp. and ‘Common’ as contrast of C . dactylon ( L. ) Pers. , ‘Tifdwarf’ and ‘Tifway’ as contrast of C . dactylon ×C . transvaalensis selections were primarily studied by the means of electrolyte leakage rate. The results showed that the LT50 of all other variaties of C. dactylon was lower than that of ‘Common’ except for‘OKc95-1’, especially C174, the LT50 of C174was -5.2℃and lower than ‘Common’ by -4.6℃; Among the cultivars of C . dactylon × C . transvaalensis, the LT₅₀ of ‘TifgreenⅡ’、‘Tifway Ⅱ’和‘Midfield’ markednessly lower than ‘Tifdwarf’ and ‘Tifway’ as -7.5℃ , -8.8℃ , -6. 0℃and the LT₅₀ of ‘Tifeagle’, ‘Tifsport’ and ‘Tiflawn’ was higher than two contrast variaties.