Effects of forchlorfenuron(CPPU)on fruit growth and quality in three different cucumber cultivars

TANG Yanling; SONG Ce; JING Yancai; MI Guoquan; MA Kai; CAI Yuxin; WANG Tengqi; WANG Zuojing; NIU Lili; WU Chenchen

doi:10.16861/j.cnki.zggc.2025.0506

Abstract：To clarify the effects of forchlorfenuron(CPPU)on the growth and quality of different cucumber types and provide a theoretical basis for precise regulation,this study used the South China-type cucumber Lübaozhu No.6,the European-type cucumber Lücui No.2,and the North China-type cucumber Bojie 616 as test materials.On the day of female flower opening,a 10 mg·L-1 CPPU solution was applied by spraying,and the fruit-setting rate,fruit growth dynamics,single fruit mass,and quality indicators such as soluble protein,soluble sugar,soluble solids,vitamin C,and amino acid content were systematically measured.The results showed that compared with the control,CPPU treatment significantly increased the growth rate,single fruit mass,and fruit-setting rate of all cultivars,and increased the fruit-setting rate of Lübaozhu No.6 and Lücui No.2 to 100％.It also significantly enhanced the soluble sugar,soluble solid,and protein content in all three cucumber cultivars.Specifically,after treatment,Lücui No.2 exhibited increases of 3.7％,8.9％,and 8.4％compared to the control,while Lübaozhu No.6 showed increases of 11.9％,13.7％,and 11.9％,respectively.The regulation of free amino acids by CPPU exhibited significant cultivar-dependent differences,increasing the content of various free amino acids in Lübaozhu No.6 and Lücui No.2,and reducing the amino acid content of of key flavors such as glutamate and proline in Bojie 616.In conclusion,10 mg·L-1 CPPU effectively improves cucumber yield and most nutritional flavor indicators,but its regulation of amino acid is strongly variety-dependent.Therefore,the application of CPPU in production must fully consider cultivar characteristics to achieve genuine high quality and yield.