大果榉种质引种北京的抗寒性鉴定

Evaluation on Cold Resistance of Zelkova sinica Germplasms Introduced to Beijing

为丰富北京冬季植物景观,引种栽培大果榉。以五年生大果榉植物的3份种质叶片为试验材料,采用电导法配合Logistic方程确定其低温半致死温度(LT50),鉴定不同种质大果榉生长期的抗寒性。结果表明:随着处理温度的降低,大果榉叶片的电解质渗出率均呈上升趋势;供试大果榉种质间的抗寒性差异较大,06-02叶片的LT50为6.91℃、06-03叶片的LT50为-5.83℃、06-04叶片的LT50为-4.39℃,3份种质抗寒性强弱顺序为06-03>06-04>06-02;生长期的大果榉06-03和06-04能够适应北京的低温环境,而06-02在引种栽培中应采取早期防寒措施。

In order to enrich the plant landscape in Beijing in winter,to introduce and cultivate Zelkova sinica.With leaves of 3 germplasm resurces of Zelkova sinica plants of five years old as test materials,the low temperature semilethal temperature(LT_(50))of those leaves was estimated by electric conductivity method with Logistic equation,the cold resistance of different germplasms in Zelkova sinica growth period was identified.The results showed that with the decrease of temperature,the electrical permeation rate of Zelkova sinica leaves showed an upward trend;The difference of cold resistance between the Zelkova sinica germplasms was great,the LT_(50) of 06-02 leaves was 6.91 ℃,the LT50 of 06-03 leaves was-5.83 ℃,the LT50 of 06-04 leaves was -4.39 ℃,and the order of cold-resistance of 3 germplasms was 06-03>06-04>06-02.Moreover,06-03 and 06-04 during growing period could adapt to the low temperature in Beijing,and 06-02 in the introduction and cultivation should take early cold precautions.