Abstract
Changes in activities of internodal soluble invertases in relation to sucrose storage in two sugarcane cultivars viz. Co 89003 (early maturing) and Co 1148 (late maturing) have been studied at different physiological stages of cane development. The higher rate of decline in the activity of soluble acid invertase with ageing of the cane coupled with rapid rise in sucrose/reducing sugars ratio indicated better sink strength and higher sucrose storage in Co 89003. Six isoenzymes of soluble acid invertase in Co 89003 and five isoforms of this enzyme in Co 1148 were identified at internodal elongation stage. However, no neutral invertase isoenzyme was detected in either cultivar at this stage. At maturity stage, three isoenzymes of neutral and four isoenzymes of acid invertase were identified in Co 89003 whereas five isoenzymes of neutral and two isoenzymes of acid invertase were identified in Co 1148. These internodal soluble invertase isoenzymes differed with respect to their catalytic efficiencies for sucrose mobilization in storage tissue. Relative to Co 1148, soluble acid invertase isoenzymes of Co 89003 were less efficient catalytically because of their low Vmax/Km values. Marked differences were also observed in the inhibitory action of Mn++ on various isoenzymes of invertase.
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