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Characterization of potato leaf starch.

Stalin Santacruz1, Kristine Koch, Roger Andersson

  • 1Department of Food Science, Swedish University of Agricultural Sciences, P.O. Box 7051, SE-750 07 Uppsala, Sweden. Stalin.Santacruz@lmv.slu.se

Journal of Agricultural and Food Chemistry
|April 1, 2004
PubMed
Summary

Potato leaf starch content varies daily and seasonally. Starch structure analysis reveals differences in amylopectin chain lengths between morning and afternoon samples, impacting starch degradation.

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Molecular Biology

Background:

  • Starch accumulation and degradation in plant leaves are complex processes.
  • The precise structure of leaf starch and its diurnal variations are not fully understood.

Purpose of the Study:

  • To investigate the diurnal changes in potato leaf starch content and structure.
  • To correlate starch structure with accumulation and degradation rates.

Main Methods:

  • Starch isolation from potato leaves collected at different times of day and months.
  • Scanning electron microscopy (SEM) for granule morphology analysis.
  • Sepharose CL-6B chromatography to determine debranched starch chain length distribution.

Main Results:

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  • Potato leaf starch content showed significant diurnal and seasonal variations.
  • SEM revealed oval or round starch granules, not exceeding 5 micrometers.
  • Amylopectin unit chains of lower molecular size were more abundant in afternoon samples.
  • Starch remaining overnight was depleted in specific chain lengths (DP 15-24 and >DP 35) compared to daytime samples.

Conclusions:

  • Diurnal changes in potato leaf starch composition, particularly amylopectin chain length, are linked to accumulation and degradation dynamics.
  • Understanding these structural variations provides insights into carbohydrate metabolism in plants.