氨基酸叶面肥对砂梨叶片光合作用的促进效应  

Effects of amino-acid fertilizers on photosynthesis in leaves of pear cultivars

作　　者：申明[1] 成学慧[1] 谢荔[1] 李翠[1] 孙新娥[1] 张治平[1] 汪良驹[1] 

机构地区：[1]南京农业大学园艺学院,江苏南京210095

出　　处：《南京农业大学学报》2012年第2期81-86,共6页Journal of Nanjing Agricultural University

基　　金：江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：以8个砂梨品种叶片为材料,研究了含有0.05、0.5和5 mg.L-15-氨基乙酰丙酸(ALA)的"爱乐壮"氨基酸叶面肥处理对砂梨叶片叶绿素相对含量(SPAD)、净光合速率(Pn)和叶绿素快速诱导荧光参数的影响。结果表明:3个处理均能不同程度地提高砂梨叶片SPAD值,增加Pn,提高PSⅡ反应中心供体侧与受体侧光合能量转换活性,减少热能量耗散。相关性分析表明,砂梨叶片Pn与光合性能指数(PIABS)、放氧复合体活性(Wk)、PSⅡ反应中心最大关闭速率(Mo)、捕获激子将电子传递到Q-A下游其他电子受体的概率(Ψo)、PSⅡ反应中心用于电子传递的量子产额(φEo)以及能量热耗散比率(φDo)等荧光参数密切相关,说明"爱乐壮"氨基酸叶面肥可以通过提高砂梨叶片光化学能量转换效率促进光合作用。从农业生产成本上看,添加0.05～0.5 mg.L-1ALA性价比更高。In this work, the concentration effect of 5-aminolevulinic acid （ ALA ） in＂ Alstrong＂ amino-acid leaf fertilizer was tested in eight cuhivars of pear（ Pyrus pyrifolia Nakai） according to its promotion on leaf chlorophyll content and photosynthesis. The results showed that when ALA concentrations were in 0.05,0.5 and 5 mg·L-1 , ＂Alstrong＂ could significantly improve the leaf SPAD, net photosynthetic rate（ P, ） and the activity of both donor side and acceptance side of PS Ⅱ reaction center at different levels dependent upon cultivars. Correlation analysis demonstrated that Pn of pear leaves was not closely related with leaf chlorophyll content （ P〉 0.05 ）, but with the photosynthetic performance index on absorption （ PIAss ）, the activity of oxygen evolving complex （ Wk ）, the maximum close rate for PS Ⅱ reaction center（ Mo ）, the probability that a trapped exciton moves an electron into the electron transport chain beyond Q^（ ^o ）, quantum yield of electron transport（ ~pEo ） and the proposition of energy dissipation through heat（ ~pDo ）. These results suggested that the promotion by＂ Alstrong＂ amino-acid leaf fertilizer on Pn of pear leaves was related with the increment of photochemical energy conversion efficiency. The concentration of ALA in 0.05-0.5 mg. L-1 was better in cost performance.

关 键 词：氨基酸叶面肥 5-氨基乙酰丙酸 叶绿素快速荧光 净光合速率 梨 

分 类 号：S661.2[农业科学—果树学]