Abstract
Metabolic changes in the levels of sucrose and hexoses in relation to the activities of sucrose synthase, sucrose phosphate synthase and invertase in low (CoS96260) and high (Co89003) sucrose storing genotypes of sugarcane have been studied. Higher activities of sucrose synthesizing enzymes in leaf and stem tissues of Co89003 as compared to CoS96260 were observed. The activities of soluble acid invertase in leaf tissue declined with the age of the crop in both the cultivars. The higher rate of decline in the activity of soluble acid invertase in the stem tissue concomitant with a higher rate of rise in the ratio of sucrose/reducing sugars indicated better sink strength of Co89003 over CoS96260. Unlike soluble acid invertase, the activity of soluble neutral invertase in stem increased with the maturity of the cane. The wall bound acid invertase activity was higher in the immature portion of the stem in both the cultivars. The negative correlation between vacuolar soluble acid invertase activity and sucrose storage, and the promotory effect of apoplastic acid invertase promise a good potential for the manipulation of invertase genes to increase sucrose accumulation in sugarcane
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