Carbohydrate metabolism during tuber initiation in potato

A transient surge in invertase activity marks the stolon to tuber transition

J. S. Minhas, V. K. Rai, H. S. Saini

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The relationship between carbohydrate metabolism and tuber initiation in potato was determined by monitoring changes in the amount of starch and sugars along with the activities of sugar metabolizing enzymes upon transfer of plants to tuber-inducing conditions (TI; short days, cold nights) from non-inducing conditions (NTI: long days, warm nights). Switch to TI conditions caused an immediate slow-down in plant growth and triggered swelling of stolon tips, which went on to develop into tubers. Leaves of plants moved to TI conditions accumulated less starch and sugar while their stolon tips showed a sudden upsurge in starch content and a sharp decline in sugars even before any tip swelling was detectable. These changes were paralleled by a transient surge in the activity of cell wall invertase (74%) and soluble invertase (30%) in stolon tips of plants transferred to TI conditions in two unrelated cultivars under different experimental conditions. As the surge in invertase activity faded, it was replaced by a substantial increase in sucrose synthase activity as the tuber enlargement proceeded. The transient increase in invertase activity just prior to tuber initiation appears to mark a turning point in the transition of stolon tip to tuber.

Original languageEnglish
Pages (from-to)113-126
Number of pages14
JournalPotato Research
Volume47
Issue number3-4
DOIs
Publication statusPublished - 1 Jan 2004
Externally publishedYes

Fingerprint

beta-Fructofuranosidase
Carbohydrate Metabolism
carbohydrate metabolism
beta-fructofuranosidase
Solanum tuberosum
tubers
potatoes
Starch
sugars
Plant Tubers
starch
Plant Leaves
Cell Wall
sucrose synthase
Enzymes
Growth
cell walls
plant growth
monitoring
cultivars

Cite this

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abstract = "The relationship between carbohydrate metabolism and tuber initiation in potato was determined by monitoring changes in the amount of starch and sugars along with the activities of sugar metabolizing enzymes upon transfer of plants to tuber-inducing conditions (TI; short days, cold nights) from non-inducing conditions (NTI: long days, warm nights). Switch to TI conditions caused an immediate slow-down in plant growth and triggered swelling of stolon tips, which went on to develop into tubers. Leaves of plants moved to TI conditions accumulated less starch and sugar while their stolon tips showed a sudden upsurge in starch content and a sharp decline in sugars even before any tip swelling was detectable. These changes were paralleled by a transient surge in the activity of cell wall invertase (74{\%}) and soluble invertase (30{\%}) in stolon tips of plants transferred to TI conditions in two unrelated cultivars under different experimental conditions. As the surge in invertase activity faded, it was replaced by a substantial increase in sucrose synthase activity as the tuber enlargement proceeded. The transient increase in invertase activity just prior to tuber initiation appears to mark a turning point in the transition of stolon tip to tuber.",
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Carbohydrate metabolism during tuber initiation in potato : A transient surge in invertase activity marks the stolon to tuber transition. / Minhas, J. S.; Rai, V. K.; Saini, H. S.

In: Potato Research, Vol. 47, No. 3-4, 01.01.2004, p. 113-126.

Research output: Contribution to journalArticle

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