Abstract
Metabolic changes in the contents of sucrose and hexoses in relation to the activities of invertase, sucrose synthase and sucrose-phosphate synthase in early (CoJ 64) and late (Co 1148) maturing cultivars of sugarcane have been studied. During early stages of cane growth, lower activities of sucrose synthase and sucrose-phosphate synthase in leaf blade In CoJ 64 over Co 1148 were observed. However, sucrose content in sheath/blade was higher in CoJ 64 than in Co 1148. With the advancing age, the activity of soluble acid invertase (pH 5.4) in stem declined more rapidly in CoJ 64. This resulted in building up of high ratio of sucroselinvert sugars in stem tissue of this cultivar. Feeding uniformly-labelled sucrose and glucose to the cut discs of leaf sheath resulted in higher uptake of 14C in CoJ 64 than in Co 1148. Uptake by stem tissue discs of 14C from sucrose was less than that from hexoses. Based on these results, it is suggested that (i) the rapid fall in the activity of soluble acid invertase in stem concomitant with fast accumulation of sucrose in this tissue is an index of early maturity of the cane, and (ii) high content of sucrose in sheath is a reflection of an efficient translocation of this sugar in early maturing cultivars.
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Abbreviations
- DAP:
-
days after planting
- UDPG:
-
uridine diphosphoglucose
- NaAc:
-
sodium acetate
- NaPi:
-
sodium phosphate
- EtOH:
-
ethanol
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Batta, S.K., Kaur, K. & Singh, R. Synthesis and Storage of Sucrose in Relation to Activities of Its Metabolizing Enzymes in Sugarcane Cultivars Differing in Maturity. J. Plant Biochem. Biotechnol. 4, 17–22 (1995). https://doi.org/10.1007/BF03262944
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DOI: https://doi.org/10.1007/BF03262944