Abstract: Fruit cucumber var.Zhongnong 19 WaS used to investigate the effects of three irrigation amount level (10w W1,middle W2 and high W3)and three fertilization amount level(10w F1,middle 1；2 and high 1：3)on soluble sugar content and sucrose-metabolizing enzymes activities of leaves under soilless culture in greenhouse.The research results showed that Effects of irrigation amount on soluble sugar content、sucrose synthase(SS)and sucrose*phosphate synthase(SPS)were significant difference.Soluble sugar content,SS activity and SPS activity in high irrigation amount level was the lowest.Effects of fertilization amount on soluble sugar content and SPS activity were significant difference,high fertilization level(F3)>middle fertilization level(r2)>low fertilization level(F1),except fruiting later stage(F2>F3>F1).Effects of fertilization on SS activity were significant difference,F2 was the best fertilization leve1.There was an obvious interaction between irrigation amount and fertilization amount.Correlation analysis indicate that there existed significantly positive correlations of on soluble sugar content and SPS activity in fruit cucumber under water-fertilizer coupling at different stages.There existed slightly correlations of on soluble sugar content and SS activity at seeding stage and fruiting early stage.but they have significantly positive correlations砒fruiting middle stage and fruiting later stage.

Key words: Water and fertilizer coupling, Cucumber leaves, Soluble sugar, SS activity, SPS activity

CLC Number: 

• S642.2