电解质渗出率配合Logistic方程鉴定7个平欧杂种榛品种(系)的抗寒性

摘要

Freezing injury is one of the main factors influencing the growth and development for European hazel. To study the cold-resistance for different European hazel cultivars, artificial low temperature stress was used, and the electrical permeation rates of mature one-year-old shoots of 7 flat-European hazel cultivars were determined during the dormant period. Then combining logistic equation and curve-fitting, semi-lethal low temperature (LT50) and cold-resistance of the 7 cultivars were calculated and appraised, which were compared with the results of field over-wintering test. Results showed that with the fall of temperature, the electrical permeation rate of the 7 cultivars increased, and the changing curves were almost the same. Yet the increasing extent was different. The semi-lethal low temperature (LT50) was-19.224℃for'06-21',-18.942℃for'Davey',-16.630℃ for'82-11',-16.246℃ for'Jinling',-16.139℃ for'Liaozhen 3',-15.859℃ for'Kuixiang'and-15.248℃for'84-572', respectively, which showed that the order of cold-resistance of'06-21'>'Davey'>'82-11'>'Jinling'>'Liaozhen 3'>'Kuixiang'>'84-572'. This result was almost the same as that of the field test, which indicated that the semi-lethal low temperature (LT50) could be used as an important index for evaluating cold-resistance of flat-European hazel cultivars.%低温冻害是影响平欧榛生长发育的最主要因素之一.为研究不同平欧杂种榛品种(系)之间抗寒性的差异性,采用人为低温胁迫诱导,对平欧杂种榛不同品种(系)休眠期成熟一年生枝进行电解质渗出率的测定,配合logistic方程进行变化曲线拟合,以计算各品种(系)低温半致死温度(LT50),鉴定7个平欧杂种榛品种(系)的抗寒性,并与田间露地越冬试验进行比较分析.结果表明,随着温度的下降,平欧杂种榛各试验品种(系)电解质渗出率逐渐增大,曲线变化趋势基本一致,但增幅有所不同,各品种曲线拐点温度(低温半致死温度)分别为'06-21'(品系)-19.224℃、'达维'-18.942℃、'82-11'(品系)-16.630℃'、金铃'-16.246℃'、辽榛3号'-16.139℃'、魁香'-15.859℃'、84-572'(品系)-15.248℃.综上分析说明7个平欧杂种榛品种(系)的抗寒性由强至弱顺序为'06-21'>'达维'>'82-11'>'金铃'>'辽榛3号'>'魁香'>'84-572',与田间试验基本吻合,说明平欧杂种榛半致死温度可作为抗寒性鉴定评价的一个重要指标.