Comparison of Cold Tolerance in Three Ground-cover Chrysanthemum Cultivars during Wintering in the Open Field  

作　　者：Xin ZHOU Man SHEN Pingsheng LENG 

机构地区：[1]College of Plant Science and Technology,Beijing University of Agriculture,Beijing 102206,China [2]College of Landscape Architecture,Beijing University of Agriculture,Beijing 102206,China

出　　处：《Agricultural Biotechnology》2022年第2期30-37,共8页农业生物技术（英文版）

基　　金：Supported by Science&Technology Nova Project under Beijing Science and Technology Commission(No.9558101600);Project of Construction of Advanced Horticulture under Beijing Municipality(2020);"Opening the List and Taking Charge"Project under Beijing University of Agriculture(2021).

摘　　要：[Objectives]Among many chrysanthemum types,the ground-cover chrysanthemum cultivar group has the characteristics of dwarf plant,long flowering period,rich color and strong resistance to stress.This study aimed to screen out cultivars with strong cold tolerance in order that they can be used for planting in urban green space and economic forests in northern cold areas,so as to enrich the plant community structures of landscape in cold regions.[Methods]Three ground-cover chrysanthemum cultivars,i.e.,‘Meiaihuang’,‘Xinhong’and‘Zixunzhang’,were selected as the experimental materials.During the wintering period in the field in Beijing,they were observed and measured for the changes of the morphological manifestations and the physiological indices,and the relationship between the indices and low temperature was analyzed.The cold tolerance of the three ground-cover chrysanthemum cultivars was also comprehensively evaluated.[Results]During the open-field overwintering period,the root activity of the three ground-cover chrysanthemum cultivars increased slowly with cooling,decreased at the freezing low temperature,and then increased again in early spring.With natural cooling,the membrane injury percentages(MIPs)of the leaves and foot shoots increased significantly,and the contents of malondialdehyde(MDA)increased;the contents of soluble sugar(SS)and proline(Pro)gradually accumulated,and the contents of SS and Pro in foot shoots increased significantly in late winter;and the superoxide dismutase(SOD)activity showed a similar trend of rising slowly at first and then increasing significantly.There were correlations between MIPs in the leaves and foot shoots of the three cultivars and other physiological indices:a significant negative correlation with MDA content,and a significant positive correlation with SS content,Pro content and SOD activity.[Conclusions]Combining the morphological manifestations and physiological indices,the cold tolerance of the three ground-cover chrysanthemum cultivars was evaluated by the s

关 键 词：Ground-cover chrysanthemum Cold tolerance Overwinter in the open field Comprehensive evaluation 

分 类 号：S682.11[农业科学—观赏园艺]