Carbohydrate metabolism during tuber initiation in potato: A transient surge in invertase activity marks the stolon to tuber transition |
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| Authors: | J S Minhas V K Rai H S Saini |
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| Institution: | (1) Central Potato Research Institute, 171 001 Shimla, India;(2) Himachal Pradesh University, 171 005 Shimla, India;(3) Institut de recherche en biologie végétale, Université de Montréal, H1X 2B2 Montréal, Canada;(4) Present address: Faculty of Environmental Studies, University of Waterloo, N2L 3 Gl Waterloo, ON, Canada |
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| Abstract: | Summary 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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| Keywords: | Solarium tuberosum L tuberization sucrose synthase starch sugars sink development |
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