Starch metabolism during growth and storage of tubers of two New Zealand potato cultivars

Abstract Polysaccharides, sugars, and enzymes involved in starch metabolism were assayed at 14‐day intervals during development and the following 2 months of storage at 9°C for two New Zealand‐bred potato cultivars—'Ilam Hardy’ and ‘Rua’. Despite changes in sugars and activities of enzymes, starch levels remained relatively constant. Glucose and sucrose levels decreased throughout development. Enzymes involved in starch synthesis and degradation were active throughout tuber development. These observations suggest that the developing tuber may act as a dynamic pool of sugars available to the plant. Changes in sugars and enzyme activities between sampling dates reflected variations in soil temperature.

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