外源腐胺对干旱胁迫下苹果幼苗光合特性的影响  

Effects of Exogenous Putrescine on the Photosynthetic Characteristics of Apple Seedling Under Drought Stress

作　　者：张媛[1] 郭兴科[1] 徐继忠[1] 

机构地区：[1]河北农业大学园艺学院,河北保定071001

出　　处：《北方园艺》2013年第21期26-29,共4页Northern Horticulture

基　　金：河北省自然科学基金资助项目(303205);国家苹果产业技术体系资助项目(CARS-28)

摘　　要：以"嘎啦"苹果幼苗为试材,采用盆栽控水方式,研究干旱胁迫下外源腐胺(Put)对苹果幼苗光合作用日变化和气体交换参数的影响。结果表明:随干旱胁迫程度加深,苹果幼苗净光合速率(Pn)下降;外源Put提高了干旱胁迫下Pn、气孔导度(Gs)、RuBP最大再生速率(Jmax)和最大光合速率(Pnmax),降低了胞间CO2浓度(Ci)。表明外源Put可缓解干旱胁迫对光合机构的伤害,综合各指标,1×10-4 mol/L外源Put浓度处理为佳。Taking ＇Gala＇ apple （Malus domestica. Borkh. cv. Gala） as material,the effect of exogenous putrescine （Put） on daily changes of photosynthesis and gas exchange parameters of apple seedling under drought stress were studied. The results showed that the net photosynthesis rate （Pn） decreased gradually with the increase of stress intensity. Under drought stress, exogenous Put promoted the Pn, stornatal conductance （Gs）, maximum regeneration rate of RuBp （Jmax） and maximum photosynthesis rate （Pnmax）, while intercelhflar carbon dioxide concentration （Ci） decreased. These results indicated that the application of exogenous Put could alleviate drought-induced damage on photosynthetic apparatus. Under this experimental conditirm, the effects of 1× 10 4 mol/L Put was the better concentration.

关 键 词：腐胺(Put) 干旱胁迫 光合作用 苹果 

分 类 号：S661.1[农业科学—果树学]