叶面喷施5、-氨基乙酰丙酸对遮阴条件下番茄生长、光合特性和产量的影响

为明确喷施外源5-氨基乙酰丙酸（ALA）对弱光条件下番茄生长发育的影响，以“金丰盛冠”番茄为材料，研究了叶面喷施ALA（0．06g／m2）对遮阴条件下番茄植株形态、叶绿索含量、光合特性及产量的影响。结果表明，遮阴处理使番茄植株高度增加，茎粗减小，叶片净光合速率（Pn）、气孔导度（Gs）、羧化效率（CE）、表观量子效率（AQY）、光补偿点（LCP）和产量降低，胞间二氧化碳浓度（Ci）、CO2补偿点（CCP）和叶绿素含量升高。遮阴环境下，叶面喷施ALA使番茄叶片Pn、Gs、CE、AQY、LCP和产量的降低幅度及Ci、CCP的升高幅度减小，并提高了叶绿素的含量，但对植株形态的影响不显著。叶面喷施ALA对80％遮阴下番茄生长、光合特性和产量的影响较小。表明在遮阴导致的弱光环境下，叶面喷施ALA能在一定程度上提高番茄叶片的光合能力，提高产量，并在一定范围内缓解遮阴对番茄生长造成的不利影响。

Effects of Foliar Spraying 5 - Aminolevulinic Acid on Growth, Photosynthesis and Yield of Tomato under Shade Conditions

To make clear the influence of 5-aminolevulinic acid(ALA) on the growth and development of tomato under weak light,the plant height,stem diameter,photosynthesis characteristics,chlorophyll content and yield of tomato were investigated after sprayed 0.06 g/m2 ALA.The results showed that the stem diameter,net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),the light compensation point(LCP) and yield of tomato were decreased by shading treatment.On the contrary,the intercellular CO2 concentration(Ci) and CO2 compensation point(CCP),chlorophyll content and plant height of tomato increased.Compared with spraying water,the decrease range of Pn,Gs,CE,AQY,LCP and yield and the increase range of Ci and CCP were relatively smaller after sprayed ALA under shade conditions,while the chlorophyll content increased.The foliar application of ALA had little influence on the tomato growth,photosynthesis characteristics and yield in 80% shade condition.In conclusion,it was benefit to the photosynthesis and yield of tomato under weak light by foliar spraying 0.06 g/m2 ALA.