Abstract
Diurnal changes in K content in leaf blades, petioles, stems and roots of eleven lucerne genotypes were followed. Significant positive correlations between changes in K content in petioles and upper half of stems and significant negative correlations between changes of K content in leaf blades and lower half of stems reflected rapid K movement. The velocity — up to 60 μmol g−1 (f.m.)h−1 — of changes in K content from leaf blades to lower part of stems and the other way round showed that long distance phloem transport occurred. Only moderate increase of K content contemporarily took place in roots. When total K amount in the whole plant was calculated then K uptake alternatively with K release were noticed during the day. Average K release reached 1.48 μmol g−1 (f.m.) h−1. The rate of K movement correlated with irradiance and physiological activity of plants. The time course of K movement was uniform in plants of the same strain and it differed partially in different strains.
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Plhák, F. Diurnal variations of potassium content in lucerne plants. Biol Plant 29, 221–229 (1987). https://doi.org/10.1007/BF02876834
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DOI: https://doi.org/10.1007/BF02876834