Abstract
Uptake rates of (86Rb)K+ by seedling roots of six cultivars were measured and compared with K+ content of the root, K+ leakage, H+ efflux, and K+-ATPase activity of a partially purified plasmalemma fraction.
Different cultivars showed significantly different rates of (86Rb)K+ uptake. The uptake rates of the first (0–5 min) period did not correlate with K+ content of the seedling roots.
The rates of uptake in the 10 to 30 min period, supposed to be active, were negatively correlated with K+ content of the root. Roots consistently leaked K+ during the first 5 min. This leakage was positively correlated with the endogenous K+ content of the tissue.
H+ efflux was significantly different among the cultivars and correlated with the K+-ATPase activity of a microsomal fraction partially purified on discontinuous (18/34%) sucrose gradient. The relationships among transport parameters are discussed.
Part of the present research was carried out at the Department of Agricultural Biotechnology of University of Padova, Italy.
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© 1990 Kluwer Academic Publishers
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Pinton, R., Varanini, Z., Maggioni, A. (1990). Properties of potassium uptake by seedling roots of grape cultivars. In: El Bassam, N., Dambroth, M., Loughman, B.C. (eds) Genetic Aspects of Plant Mineral Nutrition. Developments in Plant and Soil Sciences, vol 42. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2053-8_19
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DOI: https://doi.org/10.1007/978-94-009-2053-8_19
Publisher Name: Springer, Dordrecht
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