外源腐胺对苹果幼苗光合及叶绿素荧光特性的影响  

Effects of exogenous putrescine on the photosynthetic and chlorophyll fluorescence characteristics of apple seedlings

作　　者：张媛[1] 韩龙慧[1] 徐继忠[1] 陈海江[1] 

机构地区：[1]河北农业大学园艺学院,河北保定071001

出　　处：《河北农业大学学报》2013年第4期31-34,共4页Journal of Hebei Agricultural University

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(CARS-28)

摘　　要：以‘嘎啦’苹果1年生组培苗为试材,研究了不同浓度的外源腐胺(Put)对叶片光合作用和叶绿素荧光日变化的影响。结果表明:外源腐胺提高了苹果幼苗的净光合速率(Pn)和气孔导度(Gs),降低了胞间CO2浓度(Ci),缓解了中午强光下PSⅡ最大光化学效率(Fv/Fm)的降低,通过增加热耗散减轻过剩光能对光合机构的伤害。研究发现,外源腐胺对Pn的促进作用主要与非气孔因素有关。本试验条件下1×10-4 mol/L浓度处理为佳。Abstract： One-year-old tissue culture seedlings of ＇Gala＇ apple were used as the materials in this experiment. Effects of different concentrations of exogenous Putrescine （Put） on the pho- tosynthetic characteristics and chlorophyll fluorescence of apple seedlings were studied . The results showed that exogenous Put promoted the net photosynthesis rate（Pn）and stomatal con- ductance （Gs）, while intercellular carbon dioxide concentration（Ci）decreased. Furthermore, Put treatments relieved the decrease of PS Ⅱ photochemical quantum yield（Fv/Fm）during midday, as well as alleviated damage on photosynthetic apparatus of apple seedlings through converting excess light energy to heat energy in the form of non-photochemical quenching. The increase of Pn in the leaves in Put treatments was resulted from non-stomatal factors. Under this experi- mental condition,the effects of 1 ×10^-4 mol/L Put was the best.

关 键 词：腐胺 苹果 净光合速率 叶绿素荧光 

分 类 号：S661.1[农业科学—果树学]