Effect of calcium and magnesium foliar fertilizer on sugar contents and sugar metabolizing enzyme activities in'Feizixiao'litchi pulp
In order to explore the reason why the"sugar receding"problem of'Feizixiao1 litchi fruit can be solved by the foliar nutrient of calcium and magnesium,the 16-year-old'Feizixiao'litchi trees were taken as the experimental material,sprayed 0.3％CaCl2+0.3％MgCl2 mixed water solution on the leaf surface as the treatment,and sprayed water as the control,and the sugar contents and sugar metabolism enzyme activities of the fruit were determined.The results showed that fructose,glucose and sucrose accumulated rapidly in the early and middle stages of fruit growth and development,and the contents of fructose and glucose in the control fruit remained stable in the mature stage,while the contents of sucrose and soluble sugar decreased.The contents of fructose and total sugar in the fruit of the treatment were significantly higher than that of the control at 69 days after anthesis.The treatment significantly changed the activities of sugar metabolizing enzymes.At 69 days after anthesis,the treatment significantly increased the activities of neutral invertase and net activities of sucrose metabolizing enzymes,while the activities of acid invertase,sucrose phosphate synthase,sucrose synthase synthesis direction and phosphofructokinase significantly decreased.In summary,calcium and magnesium foliar fertilizer treatment enhances the net activities of sucrose metabolizing enzymes by increasing the activity of neutral invertase,reducing the activities of sucrose phosphate synthase and sucrose synthase synthesis,promoting sucrose decomposition,and reducing the activity of phosphofructokinase to inhibit glycolysis pathways,thereby causing the accumulation of fructose and soluble sugars,solving the problem of"sugar receding"during the mature stage of'Feizixiao'litchi.
calcium and magnesium fertilizerlitchisugarsucrose metabolizing enzyme
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