六种高丛越橘的光合特征及水分利用效率研究

Study on Photosynthetic Characteristics and Water Use Efficiency of Six Highbush Blueberry Species

以辽南地区种植的6个品种南北高丛越橘为研究对象,使用LI-6400XT便携光合仪测量其在0、20、50、100、200、500、800、1 000、1 200、1 500、1 800μmol·m-2·s-1光合有效辐射梯度下的光合-光响应曲线,采用直角双曲线修正模型进行拟合,计算光饱和点(LSP)、光补偿点(LCP)和表观量子效率(AQY)等参数,并用光合参数分析高丛越橘的水分利用情况。结果表明:利用光强和适应强光的能力南高丛品种高于北高丛品种,依次为"库帕">"奥扎克蓝">"蓝脊">"蓝鸟">"卡拉">"大粒蓝金",利用弱光的能力和表观量子效率多数北高丛品种高于南高丛品种,为"大粒蓝金">库帕>"卡拉">"蓝鸟">"蓝脊">"奥扎克蓝";多数南高丛越橘的水分利用效率高于北高丛品种,为"蓝脊">"库帕">"卡拉">"大粒蓝金">"奥扎克蓝">"蓝鸟",北高丛品种"大粒蓝金"和"卡拉"蒸腾速率小且水分利用效率较高,是节水耐旱的品种;研究结论旨在为我国种植高丛越橘提供试验依据。

Six varieties of northern and southern highbush blueberry grew in the southern region of Liaoning Province were chosen as the research object,photosynthetic active radiation gradient of light photosynthetic-light response curve was measured by use of LI-6400 XT portable photosynthesis system at 0,20,50,100,200,500,800,1 000,1 200,1 500,1 800μmol·m-2·s-1,using the rectangular hyperbola correction model fitting,computation of parameters of the light saturation point（LSP）,light compensation point（LCP）and apparent quantum yield（AQY）,simultaneously,use these photosynthetic parameters to analyze water use of highbush blueberry.The results showed that the ability of using the intensity of light and adapting hard light of southern highbush cultivars was higher than that of northern highbush cultivars,followed by‘Cooper＇‘Ozarkblue＇‘Blue Ridge＇‘Bluejay＇‘Cara＇s Choice＇＇Big gold＇,the ability and efficiency of using the weak light of majority of the northern cultivars were higher than southern highbush,followed by‘Big gold＇‘Cooper＇‘Cara＇s Choice＇‘Bluejay＇‘Blue Ridge＇‘Ozarkblue＇;Water use efficiency of the majority of southern highbush blueberry was higher than that of northern highbush cultivars,followed by ‘Blue Ridge＇‘Cooper＇‘Cara＇s Choice＇‘Big gold＇‘Ozarkblue＇‘Bluejay＇,northern highbush cultivars of‘Big gold＇and‘Cara＇s Choice＇transpiration rate were little,and water use efficiency was higher,regarded as water-saving and drought resistant cultivars.The conclusion of the study aimed to provide experimental basis for cultivating highbush blueberry in China.