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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

Author:
Pathirana, Ranjith, Harris, John C., McKenzie, Marian J.
Source:
Postharvest biology and technology 2008 v.49 no.1 pp. 180-184
ISSN:
0925-5214
Subject:
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
Abstract:
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.
Agid:
726743