Effects of exogenous gibberellin on fruit quality of blueberry
Southern highbush blueberry cultivar L25 was used as the experimental material.The fruit was sprayed with exogenous gibberellin(GA3)at the concentrations of 0,25,50,and 100 mg/L.Using water treatment as control(CK),the fruit mass,fruit transverse diameter,fruit longitudinal diameter and other appearance indicators,the contents of soluble solids,titrable acid and soluble sugar were measured after ripening.The results showed that in terms of fruit appearance,compared with CK,the appearance of blueberry fruits treated with different concentrations of GA3 was improved in general,and the single fruit weight and transverse diameter of fruit treated with 100 mg/L GA3 were larger,which increased by 10.0%and 1.6%compared with CK,respectively.In intrinsic quality aspect,compared with CK,the total amount of soluble solids was basically the same,soluble sugar content decreased significantly,titrable acid,vitamin C and anthocyanin contents increased significantly,and titrable acid and vitamin C contents at 50 mg/L GA3 treatment increased by 15.1%and 66.3%compared with CK.The anthocyanin content of 100 mg/L GA3 treatment was 28.4%higher than that of CK.In conclusion,suitable exogenous GA3 can improve the appearance and quality of blueberry fruit,and 50 and 100 mg/L GA3 can improve the quality of blueberry fruit better.
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