Sugar Accumulation in Different Pineapple Varieties
The differences in fruit growth and development,sugar accumulation and enzyme activities related to sugar metabolism were studied in the fruit of pineapple cv.'Comte de paris'and'Smooth Cayenne'.The results showed that both'Comte de paris'and'Smooth Cayenne'fruit growth curve was in single'S'pattern.The growth was slow in young fruit period,then accelerated in rapid growth period,and slowed down at the stages of fruit maturation.There was one peak in the whole growth period.The different varieties had different pattern of sugar accumulation.In'Comte de paris',there was more sucrose than reducing sugars accumulated with a hexose to sucrose ratio of 0.65.In contrast,in'Smooth Cayenne',more reducing sugars were accumulated and the ratio was 5.92.Sugar accumulation was closely related to sink activity.Different cultivars showed difference in dominant enzymes.The dominant enzymes in'Comte de paris'were SPS,NI and AI,whereas NI and AI in'Smooth Cayenne'.