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American Potato Journal

, Volume 70, Issue 3, pp 227–241 | Cite as

The effect of timed water stress on quality, total solids and reducing sugar content of potatoes

  • Clinton C. Shock
  • Zoe Ann Holmes
  • Tim D. Stieber
  • Eric P. Eldredge
  • Peifang Zhang
Article

Abstract

Potato (Solanum tuberosum L.) solids and reducing sugars were examined before, just after, and two weeks after transient water stress to gain an understanding of tuber changes that occur directly associated with water stress. Russet Burbank and A082260-8 potatoes were grown on Owyhee silt loam at the Malheur Experiment Station, Ontario, Oregon. Potatoes were subjected to a single episode of transient water stress by omitting furrow irrigation in either late June, July, or in early August of 1988 and 1989 to examine variety differences in the short term effects of water stress on changes in solids and reducing sugars in tuber stem ends. Irrigation was managed to maintain soil water potential above -65 kPa at 20 cm depth during tuber initiation through bulking except during transient stress when the soil water potential reached -82 to -110 kPa. Tuber samples were taken from plots and minimally stressed check treatments before stress, at the peak of stress, two weeks after the transient stress period, and after harvest. Tubers were sectioned longitudinally and the percent solids and reducing sugars were determined for samples from the tuber stem end, center, and apical end. Longitudinal tuber strips were fried after harvest to determine fry color. Tuber stem-end fry color did not darken in A082260-8 potatoes subjected to water stress. The line A082260-8 had higher stem-end solids and lower stem-end reducing sugars than Russet Burbank. Neither variety responded to transient water stress or recovery from transient stress with an immediate increase in reducing sugars in any tuber part. Reducing sugars were elevated in harvested tubers, particularly in the stem-ends of Russet Burbank potatoes subjected to water stress. Increases in tuber reducing sugars related to transient water stress were not found during the stress period or immediately after stress, but were present in harvested tubers.

Additional Key Words

Dark-end fry color sugar-end soil water potential 

Compendio

Se examinaron los sólidos y los azúcares reductores de la papa (Solanum tuberosum L.), antes, inmediatamente después y dos semanas después de un breve estrés al agua para determinar los cambios que ocurren en los tubérculos, directamente asociados con el estrés al agua. Papas Russet Burbank y A082260-8 se cultivaron en suelo franco-limoso de Owyhee en la Estación Experimental Malheur, Ontario, Oregón. Las papas fueron expuestas a un solo periodo de breve estrés al agua, omitiendo el riego por surco ya fuese al final de junio, julio o a comienzos de agosto de 1988 y 1989, para determinar las diferencias varietales en los efectos del corto periodo de estrés al agua sobre los sólidos y azúcares reductores en el extremo basal del tubérculo. La irrigación fué suministrada para mantener el potencial de agua del suelo por encima de -65 kPa a 20 cm de profundidad durante el inicio de la tuberización y durante todo el periodo de desarrollo de los tubérculos, excepto durante el breve estrés, en que el potencial de agua del suelo alcanzó de -82 a -100 kPa.

Se tomaron de las parcelas, y de los tratamientos testigo con estrés mínimo, muestras de tubérculos antes del estrés, al momento de máximo estrés, dos semanas después del breve periodo de estrés y después de la cosecha.

Los tubérculos fueron seccionados longitudinalmente y se determinó el porcentaje de sólidos y de azúcares reductores en muestras tomadas del extremo basal, centro y extremo apical de los mismos. Se frieron rebanadas longitudinales de papas después de la cosecha para determinar el color de la fritura. El color de las porciones basales, después de fritas, no se oscureció en las papas A082260-8 expuestas al estrés al agua. La línea A0822608 tuvo en el extremo basal más sólidos y menos azúcares reductores que Russet Burbank. Ninguna de las variedades respondió al breve estrés al agua o se recobraron del mismo con un aumento inmediato de azúcares reductores en alguna parte del tubérculo. Los azúcares reductores fueron abundantes en los tubérculos cosechados, particularmente en los extremos basales de las papas Russet Burbank expuestas al estrés al agua. Durante el periodo de estrés, o inmediatamente después, no se encontraron incrementos de azúcares reductores en los tubérculos en relation con el breve estrés al agua, pero sí se observaron en los tubérculos cosechados.

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Copyright information

© Springer 1993

Authors and Affiliations

  • Clinton C. Shock
    • 1
  • Zoe Ann Holmes
    • 2
  • Tim D. Stieber
    • 3
  • Eric P. Eldredge
    • 4
  • Peifang Zhang
    • 5
  1. 1.Malheur Experiment StationOregon State UniversityOntario
  2. 2.Nutrition and Food ManagementOregon State UniversityCorvallis
  3. 3.USDA Hydrologic Unit ProjectUniversity of IdahoPayette
  4. 4.University of IdahoCaldwell
  5. 5.North Carolina State UniversityRaleigh

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