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Osmotic potentials and solute concentrations in sugar beet plants cultivated with varying potassium/sodium ratios
Author(s) -
Lindhauer Meinolf G.,
Haeder Hans E.,
Beringer Helmut
Publication year - 1990
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19901530107
Subject(s) - sugar beet , potassium , sugar , shoot , sodium , chromosomal translocation , taproot , sucrose , chemistry , nutrient , botany , horticulture , biology , biochemistry , organic chemistry , gene
Cell saps from leaves, petioles and storage root of sugar beet plants were analysed to indicate the possible specific and/or non‐specific (osmotic) function of K and Na ions for the regulation of assimilate partitioning in sugar beet. Plants were cultivated up to 94 days in nutrient solutions containing either 4.5 mol m −3 K + 0.5 mol m −3 Na (K plants) or 0.5 mol m −3 K + 4.5 mol m −3 Na (Na plants) or 0.5 mol m −3 K + 0.5 mol m −3 Na (control). Osmotic potentials of the cell sap of leaf blades (−1.4 to −1.6 MPa) and petioles (−1.6 to −2.0 MPa), respectively, were rather low and similar. It was concluded that in these organs Na may replace K in its osmoregulatory functions. While shoot growth was favoured by Na, a principally improved translocation of K into the taproot was noted. This was ‐ especially in the K‐treatment ‐ associated with increased growth of the storage root and a simultaneously stimulated sucrose accumulation. The results are discussed in terms of a different compartmentation of K, Na and Cl within the cell and within the whole plant and of a specific role of potassium in the process of assimilate translocation and storage.