5份野生鸭茅材料高温半致死温度与耐热性研究

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

以鸭茅(Dactylis glomerata L.)幼苗叶片为材料,用改良电导法测定配合Logistic方程求拐点温度的方法测定了5种野生鸭茅材料的高温半致死温度(LT50)。结果表明,经等梯度的高温处理后,待试材料叶片细胞伤害率和温度之间呈现明显的S形曲线,符合Logistic方程,拟合度较好。抗热性排序为:川东鸭茅(LT50=53.50℃)>长阳鸭茅(LT50=53.32℃)>宝兴鸭茅(LT50=52.98℃)>金丝岭鸭茅(LT50=52.84℃)>板壁岩鸭茅(LT50=52.14℃)。通过对供试材料在武汉地区越夏情况的田间观测,发现川东鸭茅、长阳鸭茅长势良好,因此认为这2种材料的耐热性较强。

The high temperature LTso 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 cuhivars 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.