外施植物生长调节剂对蓝莓果实膨大的影响OA

Taking'Primadonna'blueberry as the experimental material,fifteen days after full bloom,blueberry fruits were sprayed with 75 mg·L-1 GA3,5 mg·L-1 CPPU and 30 mg·L-1 NAA,respectively.The effects of plant growth regulator treatments on the fruit size,microstructure,and endogenous hormones of'Primadonna'blueberry were investigated,in order to provide reference for the rational use of plant growth regulators in blueberry production.The results showed that all three plant growth regulator treatments promoted blueberry fruit enlargement.At 40 days after treatment,compared to the control,the transverse diameters of fruits in the GA3,CPPU and NAA treatment groups increased by 6.43％,11.39％and 5.36％,respectively;longitudinal diameters increased by 5.00％,7.98％and 6.79％,respectively;and single fruit weights increased by 21.60％,35.80％and 20.37％,respectively.Microscopic structure observation revealed that all treatments,to varying degrees,promoted an increase in the cell cross-sectional area of the outer mesocarp,middle mesocarp,and inner mesocarp,as well as a thickening of the pericarp tissue.In terms of endogenous hormones,at 7 days after treatment,the endogenous GA3 content in fruits treated with GA3 and CPPU was 122.9％and 406.6％higher than the control,respectively.At 22 days after treatment,the endogenous IAA content in fruits was 26.76％and 40.22％lower than the control,respectively.The endogenous ABA content in NAA-treated fruits at 22,37 days and 40 days after treatment was 188.6％,17.8％and 16.7％higher than the control,respectively,and the endogenous IAA content at 22 days after treatment was 12.57％lower than the control.Appropriate concentrations of GA3,NAA and CPPU could effectively promote blueberry fruit enlargement,and among these treatments,5 mg·L-1 CPPU showed the best effect.The effect of applying plant growth regulators to promote blueberry fruit enlargement was closely related to their promotion of fruit cell volume increase and the regulation of endogenous hormones.