外施芥子酸对猕猴桃叶片光合特性及果实品质的影响OA

[Objective]This study investigated the effects of sinapic acid treatment on photosynthetic cha-racteristics and fruit quality of kiwifruit,to provide a theoretical foundation and technical support for improving kiwifruit fruit quality.[Method]Using the superior line'23-1'of Actinidia deliciosa as experimental material,three sinapic acid concentration gradients(0.25,0.5,and 1.0 mmol/L)were established and two treatment methods(foliar spraying and root irrigation)were applied in this study to systematically analyze the effects of sinapic acid on the photosynthetic characteristics of kiwifruit plants and the external/internal quality of the fruits.[Result]The application of sinapic acid enhances chlorophyll content in kiwifruit leaves across various develop-mental stages,with the 0.5 mmol/L root irrigation showing the most significant effect.The treatment improved leaf photosynthetic efficiency by increasing net photosynthetic rate,intercellular CO2 concentration,and stomatal conductance,with the 1.0 mmol/L foliar spraying showing the most significant effect.Both root irrigation and foliar spraying treatments with 1.0 mmol/L sinapic acid significantly enhanced individual fruit weight during maturation stage,with increases of 17.8％ and 15.9％,respectively,outperforming other treatments.Post-ripe-ning fruits treated with 0.5 mmol/L foliar spraying exhibited a notable increase of 9.76％ in soluble solids con-tent,though accompanied by significant reductions in vitamin C and flavonoid content.Conversely,1.0 mmol/L root irrigation treatment elevated post-ripening fruit quality by increasing soluble solids and vitamin C content by 9.05％ and 54.71％,respectively.[Conclusion]Based on the integrated analysis of overall effects of sinapic acid on the photosynthetic characteristics of kiwi leaves and fruit quality,the 1.0 mmol/L root irrigation treat-ment was determined to be the most effective.