河南农业科学2017，Vol.46Issue(10)：116-121,6.DOI:10.15933/j.cnki.1004-3268.2017.10.021
5种常绿阔叶植物在北京越冬的抗寒性研究
Study on Cold Resistance of Five Evergreen Broad-leaf Plants during the Winter in Beijing
摘要
Abstract
During the natural decreasing process of air temperature from autumn to winter,the relative electrical conductivity(REC) and the semi-lethal temperature(LTs0) were determined in leaves of five evergreen broad-leaf plants in order to determine the best period for evaluation of cold resistance.Using principal component analysis and subordinate functions to assess comprehensively the LT50,soluble protein,soluble sugar,peroxide enzyme(POD) and proline content in the leaves of five tree species in the best period and to provide theoretical basis for the selection and promotion of evergreen broad leaved plants.The results showed that:The REC of the five evergreen broad-leaf plants increased following an S-curve in the 6 months and obeyed the regulation of Logistic model.The LT50 of five tree species decreased with the decrease in temperature firstly,and then increased,the range of LT50 in Buxus sinica (Rehd.et Wils.) was from-33.210 3 ℃ to-13.302 3 ℃,which possessed high cold resistance.The range of LT50 in other four tree species was from-24.268 3 ℃ to-6.443 1 ℃,which lower than that of Buxus sinica(Rehd.et Wils.).The LT50 sorted differently in different months.The best period of cold resistance evaluation was selected in February (January 21th—February 21th)with the strongest cold resistance and the lowest natural temperature.For a comprehensive evaluation of the cold resistance of the five tree species in February,the results indicated that Buxus sinica(Rehd.et Wils.) was the strongest cold resistant plant,followed by Euonymus japonicus Thunb.,then Magnolia grandiflora Linn,and Photinia serrulata Lindl.,finally Viburnum rhytidophyllum Hemsl.The present study showed that LT50 can accurately reflect cold resistance of plants,and it was basically consistent with cold resistant index sorting.关键词
常绿阔叶植物/相对电导率/半致死温度/抗寒性Key words
evergreen broad-leavf plants/relative electrical conductivity/semi-lethal temperature/cold resistance分类
农业科技引用本文复制引用
张敏,王明梅,王晨阳,王意敏,刘忠华..5种常绿阔叶植物在北京越冬的抗寒性研究[J].河南农业科学,2017,46(10):116-121,6.基金项目
北京市科技计划项目(Z121100008512002) （Z121100008512002）
