3种玉兰花瓣抗寒临界温度的测定  

Determination of critical temperature of cold in 3 Magnolia petals

作　　者：张超[1] 唐秀光[1] 李玲[1] 陈光[1] 李彦慧[1] 

机构地区：[1]河北农业大学园林与旅游学院,河北保定071001

出　　处：《河北农业大学学报》2011年第4期45-49,共5页Journal of Hebei Agricultural University

基　　金：国家"948"项目(2001-40);河北省自然科学基金(C2007000508)

摘　　要：以4年生白玉兰(Magnolia denudata)、紫玉兰(M.liliflora)、二乔玉兰(M.×soulangeana)不同花期外层花瓣为试材,分别通过对过冷却点、半致死温度以及人工模拟自然霜箱后试材的褐变率的统计,来确定玉兰花瓣的抗寒临界温度。结果表明:白玉兰的抗寒临界温度范围为-5.46^-3.85℃,紫玉兰为-5.81^-4.83℃,二乔玉兰为-5.73^-4.03℃。且随着花器官的发育,抗寒临界温度升高,对低温的反映也越加敏感。因此应在盛花期做好玉兰的防寒保护工作。Using 4-year-old petals of Magnolia denudata,M.liliflora and M.×soulangeana as materials,super-cooling points,semi-lethal temperature and browning rate were evaluated after the treatment of artificial frost box to determine the critical temperature of cold in 3 petals of Magnolia.The results show that the critical temperature of cold in M.denudata ranged between-5.46——3.85 ℃,M.liliflora between-5.81——4.83 ℃ and M.×soulangeana between-5.73——4.03 ℃,and as the development of the floral organs,the critical temperature of cold increased and the floral organs became more sensitive to low temperature.So protection against cold to Magnolia should be taken during the full blossom period.

关 键 词：玉兰 过冷却点 褐变率 半致死温度 临界温度 

分 类 号：S662.2[农业科学—果树学]