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Carbohydrate metabolism during tuber initiation in potato: A transient surge in invertase activity marks the stolon to tuber transition

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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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Author notes

  1. H. S. Saini

    Present address: Faculty of Environmental Studies, University of Waterloo, N2L 3 Gl, Waterloo, ON, Canada

Authors and Affiliations

  1. Central Potato Research Institute, 171 001, Shimla, India

    J. S. Minhas

  2. Himachal Pradesh University, 171 005, Shimla, India

    V. K. Rai

  3. Institut de recherche en biologie végétale, Université de Montréal, H1X 2B2, Montréal, Canada

    H. S. Saini

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  1. J. S. Minhas
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Correspondence to H. S. Saini.

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Minhas, J.S., Rai, V.K. & Saini, H.S. Carbohydrate metabolism during tuber initiation in potato: A transient surge in invertase activity marks the stolon to tuber transition. Potato Res. 47, 113–126 (2004). https://doi.org/10.1007/BF02735978

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