Research on cold resistance of Syringa pekinensis "Beijing Gold" under temperature stress
Syringa pekinensis "Beijing Gold" is a precious cultivar with yellow flower in Syringa.So this research studied the cold tolerance of Syringa pekinensis "Beijing Gold" in order to determine the feasibility of Syringa pekinensis "Beijing Gold" used in cold area in Heilongjiang Province.The annual branches of Syringa pekinensis "Beijing Gold",as contrast of Syringa reticulate var.mandshurica Hara,were used to measure their physiological response to low temperatures from 0℃ to-40℃ using four indices,such as relative electric conductivity,SOD activity,POD activity,and soluble protein,through an artificially-simulated cooling process.Based on correlation analysis among the indices and its wintering performance under natural conditions,to comprehensive evaluate its cold resistance.It was shown that Syringa pekinensis "Beijing Gold" grafed on Syringa reticulate var.mandshurica Hara can live through the winter naturally in Harbin.The blooming time of Syringa pekinensis "Beijing Gold" was later about five days than Syringa reticulate var.mandshurica Hara,the flowering lasted from early July to late July,for more than 20 days.The blooming of Syringa pekinensis "Beijing Gold" grafed on Syringa reticulate var.mandshurica Hara in Harbin than those of grafed on Syringa pekinensis place of origin postponed for a month or so.With the deepening of low temperature stress,the relative electric conductivity,POD activity,SOD activity and soluble protein of Syringa pekinensis "Beijing Gold" and Syinga reticulate var.mandshurica Hara presented the upward tendency.There is highly significant difference between the change of POD activity and soluble protein.The change of relative electric conductivity was in very significant difference,and the change of SOD activity had not significant difference.The LT50 of Syringa pekinensis "Beijing Gold" and Syringa reticulate var.mandshurica Hara were-35.08℃,-39.11℃.This study establishes the foundation for the application of Syringa pekinensis "Beijing Gold".
Syringa pekinensis "Beijing Gold"cold resistanceartificial low temperature
NETL
NSTL
万方数据
维普
