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Article
Potassium Nutrition and Translocation in Sugar Beet
Plant Physiology
  • Terrance R. Conti
  • Donald R. Geiger, University of Dayton
Document Type
Article
Publication Date
7-1-1982
Abstract
The effect of increased net foliar K+ accumulation on translocation of carbon was studied in sugar beet (Beta vulgaris, L. var. Klein E and US H20) plants. Net accumulation of recently absorbed K+ was studied by observing arrival of 42K+per unit area of leaf. Labeled K+ was added to give an initial concentration at 2 or 10 millimolar K+ in mineral nutrient solution. Because the newly arrived K+constitutes a small part of the total leaf K+ in plants raised in 10 millimolar K+, export of 42K+ by phloem was negligible over the 2- to 3-day period; consequently, accumulation is a measure of arrival in the xylem. In leaves from plants in 2 millimolar K+, export by the phloem was estimated to be of the same order as import by the xylem; K+ per area was observed to remain at a steady-state level. Increasing the supply of K+ to 10 millimolar caused arrival in the xylem to increase 2- to 3-fold; K+ per area increased gradually in the mature leaves. Neither net carbon exchange nor translocation of sugar increased in response to a faster rate of arrival of K+ over a 6- to 8-hour period. In the absence of short-term effects, it is suggested that K+-promoted increase in synthetic metabolism may be the basis of the increased carbon assimilation and translocation in plants supplied with an above-minimal level of K+.
Inclusive pages
168-172
ISBN/ISSN
0032-0889
Publisher
American Society of Plant Biologists
Peer Reviewed
Yes
Disciplines
Citation Information
Terrance R. Conti and Donald R. Geiger. "Potassium Nutrition and Translocation in Sugar Beet" Plant Physiology Vol. 70 (1982)
Available at: http://works.bepress.com/donald_geiger/32/