论文部分内容阅读
将112份狗牙根(Cynodon dactylon)材料的离体叶片进行模拟低温处理,用电导法测其电导率,将电导率拟合Logistic方程,计算出狗牙根各材料叶片的半致死温度(LT50),并将6项形态指标及半致死温度进行相关性分析。结果表明:新疆狗牙根叶片半致死温度的变化范围为-11.67~-19.68℃,平均LT50为-14.84℃,变异系数为9.92%;新疆狗牙根种质资源各外部性状都存在不同程度的变异,其中叶层高度与株高变异最大,分别达到47.02%,34.89%;相关分析表明,LT50与叶长、叶宽、匍匐茎节间长及叶层高度间具有显著的负相关性(P<0.05),而叶长与叶宽、叶层高度、匍匐茎节间长间具有极显著正相关性(P<0.01)。
112 leaves of Cynodon dactylon were subjected to simulated low temperature treatment. The conductivity was measured by conductivity method. The logistic equation was fitted to the conductivity to calculate the lethal temperature (LT50) of leaves of Cynodon dactylon. Six morphological indexes and semi-lethal temperature were also analyzed. The results showed that the change of the lethal temperature of bermudagrass from Xinjiang was -11.67 ~ -19.68 ℃, the average LT50 was -14.84 ℃ and the coefficient of variation was 9.92%. The germplasm resources of Xinjiang bermudagrass germplasm resources had different degrees of variation, Among them, leaf height and plant height were the highest, reaching 47.02% and 34.89% respectively. Correlation analysis showed that there was a significant negative correlation between LT50 and leaf length, leaf width, internode length and leaf height (P <0.05) , While leaf length and leaf width, leaf height, and internode length of stolon had a significant positive correlation (P <0.01).