High Temperature LT_(50) and Heat Resistance of Five Wild Dactylis glomerata

The high temperature LT50 of 5 wild Dactylis glomerata was detected with electrical conductivity method combined with Logistic equation. The results showed that the tested materials had apparently S-curve trend with temperature in the injury rate of leave cells after treated with gradient high temperature. The Logistic equation was well fitted with this trend.The semi-lethal temperatures of the 5 cultivars were in the order of Dactylis glomerata cv. Chuandong(LT50=53.50 ℃),Dactylis glomerata cv. Changyang(LT50=53.32 ℃), Dactylis glomerata cv. Baoxing(LT50=52.98 ℃), Dactylis glomerata cv.Jinsiling(LT50=52.84 ℃) and Dactylis glomerata cv. Banbiyan(LT50=52.14 ℃). Through observing its field trials in summer in Wuhan, the Dactylis glomerata cv. Chuandong and Dactylis glomerata cv. Changyang grew well with strong heat resistance.