This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Geiger, D. R. Articles by Conti, T. R. Search for Related Content PubMed PubMed Citation Articles by Geiger, D. R. Articles by Conti, T. R. Agricola Articles by Geiger, D. R. Articles by Conti, T. R.

Articles

Relation of Increased Potassium Nutrition to Photosynthesis and Translocation of Carbon ¹

Department of Biology, University of Dayton, Dayton, Ohio 45469

Effects of supplying K⁺ at 2 or 10 millimolarity concentration on net carbon exchange and translocation of products of photosynthesis were studied in plants of Beta vulgaris L. (var. Klein E). Transport of K⁺ into and out of leaves was studied with ⁴²K over a 3-day period. Increasing the K⁺ supplied to the roots from 2 millimolarity, a level just sufficient to overcome obvious deficiency symptoms, to 10 millimolarity resulted in a gradual accumulation of K⁺ per unit area and an increased export of K⁺ to sink regions. No significant increase in net carbon exchange was observed in leaves that had accumulated a high level of K⁺ per unit area. Initiation rate, total area, and total fresh weight of leaves of plants with K⁺ supplied at 10 millimolarity was similar to that for leaves from plants at a 2 millimolarity level. Shoot/root ratio and dry weight accumulation, which are indicative of translocation and partitioning over the long term, were independent of K⁺ supply in the 2 to 10 millimolarity range. Accumulation of K⁺ by exporting leaves and its subsequent recirculation to sinks increased when K⁺ supply was increased in this range but did not appear to affect carbon nutrition even after a long period.

This article has been cited by other articles:

				S. Kanai, K. Ohkura, J. J. Adu-Gyamfi, P. K. Mohapatra, N. T. Nguyen, H. Saneoka, and K. Fujita Depression of sink activity precedes the inhibition of biomass production in tomato plants subjected to potassium deficiency stress J. Exp. Bot., August 1, 2007; 58(11): 2917 - 2928. [Abstract] [Full Text] [PDF]