摘要
为丰富我国北方地区春季园林景观,选育抗寒性较强的早春开花植物品种,以白玉兰和紫叶李2种北方地区典型的早春开花植物为研究对象,设置4个温度梯度,通过LI-6400人工控制光强和CO_2浓度测定相关光合生理参数,对不同低温胁迫状态下白玉兰和紫叶李叶片的光合生理响应曲线进行拟合,并结合叶绿素荧光参数分析叶片的光合能力和抗寒性。结果表明:对照处理条件下,白玉兰的光饱和最大净光合速率(PLmax)、CO_2饱和最大净光合速率(PCmax)、最大光化学效率(F_v/F_m)、有效光化学效率(Fv′/Fm′)、潜在活性(Fv/F0)、羧化效率(CCE)等指标分别比紫叶李高17.85%、16.47%、3.80%、55.81%、52.27%、21.82%,并且二者各项指标均随胁迫温度的降低呈下降趋势,到0℃时白玉兰和紫叶李的CO_2饱和最大净光合速率分别下降了65.47%、73.77%,白玉兰的下降幅度较小;对照处理条件下,表观量子效率(AQY)表现为白玉兰低于紫叶李,但温度降到0℃时,白玉兰的表观量子效率是紫叶李的1.33倍,说明在寒冷环境中白玉兰利用弱光进行光合作用的能力高于紫叶李,其抗寒性较强。
As the typical vegetation blooming in early spring in northern China,Magnolia denudata and Prunus cerasifera f.atropurpurea were researched to select strong cold resistant varieties.The response of photosynthesis rate to light intensity and CO2 concentration in different temperature of M.denudataand P.cerasiferaf.atropurpurea were measured and fitted by using LI-6400 portable photosynthesis system.Meanwhile,the chlorophyll fluorescence parameters of leaves in different temperatures were studied to analyze the photosynthetic capacity and cold resistance.The results are showed as follows：the maximum net photosynthetic rate of saturated light（PLmax）,the maximum net photosynthetic rate of saturated CO2（P（Cmax））,the maximal photochemical efficiency of PSⅡ（Fv/Fm）,effective photochemical efficiency of PSⅡ（Fv′/Fm′）,potential activity of PSⅡ（Fv/F0）and carboxylation efficiency（CCE）of M.denudata were 17.85%,16.47%,3.80%,55.81%,52.27% and 21.82%,higher than that of P.cerasiferaf.atropurpureain the CK treatment.The index showed a downward trend as temperature decreased.The maximum net photosynthetic rate of saturated CO2 of M.denudata and P.cerasiferaf.atropurpureadeclined by 65.47% and 73.77% in the CK treatment.Apparent quantum yield（AQY）of M.denudata,lower in the CK treatment,were 1.33 times of that of P.cerasiferaf.atropurpureain the low temperature treatment.The photosynthetic capacities and cold resistance of M.denudata were higher than that of P.cerasiferaf.atropurpureain the cold environment.
作者
孙双印
李晓靖
SUN Shuangyin;LI Xiaojing(Saihanba Mechanized Foresry Center of Hebei Province,Weichang 068466,Chin)
出处
《林业与生态科学》
2018年第2期196-202,共7页
Forestry and Ecological Sciences
关键词
白玉兰
紫叶李
光合作用
低温胁迫
Magnolia denudata
Pvunus cevasi feva f. atropurpurea
photosynthesis
low temperature stress
