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A comparison of microtubers and field-grown tubers of potato (Solanum tuberosum L.) for hexoses, sucrose and their ratios following postharvest cold storage

Pathirana, Ranjith, Harris, John C., McKenzie, Marian J.
Postharvest biology and technology 2008 v.49 no.1 pp. 180-184
Solanum tuberosum, potatoes, tubers, correlation, experimental design, postharvest physiology, postharvest treatment, food quality, hexoses, cold storage, plant breeding, selection criteria, enzyme activity, genotype, glucose, sucrose, beta-fructofuranosidase
Cold-induced sweetening (CIS) is a significant postharvest problem in processing potato (Solanum tuberosum L.) tubers. A rise in hexose sugar levels during cold storage results in a brown, bitter tasting and unmarketable product. We tested if potato microtubers (MicroT) can undergo CIS and if this corresponds to the CIS response in field-grown tubers (FieldT) with the hope of fast-tracking breeding programmes using a MicroT system. Using MicroT from potato genotypes representing a range of CIS response levels we have demonstrated that MicroT undergo CIS more rapidly than FieldT. Correlations of glucose:sucrose and hexose:sucrose ratios were highly significant between the two tuber types after cold treatment and these ratios are known to be good predictors of invertase activity, a key regulator of CIS. Correlations of individual sugars were non-significant before and after postharvest cold treatment.