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Diurnal variations of potassium content in lucerne plants

Authors :
F. Plhák
Source :
Biologia Plantarum. 29:221-229
Publication Year :
1987
Publisher :
Institute of Experimental Botany, 1987.

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.

Details

ISSN :
15738264 and 00063134
Volume :
29
Database :
OpenAIRE
Journal :
Biologia Plantarum
Accession number :
edsair.doi...........9324134035242cd6ee2ba324be105af4
Full Text :
https://doi.org/10.1007/bf02876834