Effect of Different Potassium Fertilization on Sugar Content and Related Metabolic Enzymes of Pineapple during Development
In order to explore the mechanism of potassium effects on pineapple sugar metabolism and provide a scientific and rational fertilizer practice for pineapple planting,the effect of potassium on sugar and their correlative enzymes of pineapple were studied.Comte de paris pineapple was applied with K2SO4 by 4 different ways.The results indicated that potassium increased sucrose,fructose and glucose content of pineapple fruit.Different applications had different effect on enzymes related to sucrose metabolism in different developing stages.However,total sugar content,invertase,sucrose synthase and sucrose phosphate synthase activities showed a consistent variation tendency as the fruits mature.Different treatments increased invertase and sucrose synthase leavage activity,and reduced sucrose phosphate syhthase and sucrose synthase syhthesis activity.Foliage spraying K2SO4 plus soil applying K2SO4 was more effective than the other two treatments.This implied that under K3 treatment fruit sink strength was increased by enhancing the activities of the four enzymes.With increased pineapple fruit sink strength,phytosynthate translocation was accelerated.