The Ornamental Evaluation And Studies Of Heat And Cold Resistance Of Several Introduced Perennial Flowers

The Ornamental value of 20 Perennial flowers introduced by Botanical Garden of Zhejiang forestry university are evaluated and heat and cold resistance of five species are studied in this paper.Accroding to the characteristics of the Perennial flowers,14 appraisal indexes are selected and a muhifactoririal appraisal system based on the Analytic Hierarchy Process is developed for the aim of getting the ornamental value of the Perennial flowers,and 14 appraisal indexes of the Perennial flowers are analyzed through Analytic Hierarchy Process(AHP).Accroding to the muhifactoririal appraisal system,20 Perennial flowers introduced by Botanical Garden of Zhejiang forestry university are judged by this way and makes satisfied results,which are an important and scientific foundations for the gardens green in Lin an areas.The correlation analyses among the data of electric conductivity,SOD and POD activhy.soluble protein and chlorophyll content show that the former three methods could reflect the heat and cold resistance of five perennial flowers.The electrolyte leakage rate of the blade cell have a markable negative correlation with the heat and could resistance,Whereas,after high temperature treatment, chlorophyll content have some changes,but could not expressed relationship with head formation,and could not be used as a physiological trait for heat tolerance.SOD and POD relative activity and soluble protein content have different change rules under different heat and cold stress,and so it could be as index for heat and cold tolerance.The result shows that there are obvious differences of resistance among five perennial flowers:in heat tolerance,Monar dadidyma 'Croftway Pink'＞Myosotis alpestris 'Blue-forget me not'＞Ve-onica spicata'Epis bleus'＞Myosotis alpestris 'Blue-forget me not'＞Trollius europaeus'Globe flower':in cold tolerance,Veronica spicata 'Epis bleus'＞Monar dadidyma 'Croftway Pink'＞Cheiranthus cheirii 'Naine'＞Myosotis alpestris 'Blue-forget me not'＞Trollius europaeus'Globe flower'.