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Starch synthesis in potato (Solanum tuberosum) tubers: Activity of selected enzymes in dependence of potassium content in storage tissue

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Abstract

Starch synthesis in potato tubers grown at varied K nutrition 0.1 (K1), 0.25 (K2) and 1.0 mmol K L- nutrient solution (K3) was investigated with particular regard to the activity of selected enzymes (sucrose synthase, UDP-D-glucose pyrophosphatase, starch phosphorylase, amylases) in dependence on tuber K content. Allocation of K to the tubers was nearly the same in all treatments. The activity of enzymes related to tuber K content did not differ significantly. Starch and K content of tubers increased with progressing age, whereas a decrease was observed in growth rate, starch synthesis per day and K uptake per day. Positive correlations between the rates of K uptake, starch production and growth indicate that the dynamic phase of K supply to the tubers is of greater importance for starch synthesizing processes than the influence of total K content.

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Authors and Affiliations

  1. Agricultural Research Station Büntehof, Bünteweg 8, D-3000, Hannover 71, FRG

    M. G. Lindhauer & M. A. R. De Fekete

  2. Botany Department, T.H. Darmstadt, Schnittspahnstr. 3-5, D-6100, Darmstadt, FRG

    M. G. Lindhauer & M. A. R. De Fekete

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  1. M. G. Lindhauer
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  2. M. A. R. De Fekete
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Lindhauer, M.G., De Fekete, M.A.R. Starch synthesis in potato (Solanum tuberosum) tubers: Activity of selected enzymes in dependence of potassium content in storage tissue. Plant Soil 124, 291–295 (1990). https://doi.org/10.1007/BF00009275

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  • DOI: https://doi.org/10.1007/BF00009275

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