Osmotic potentials and solute concentrations in sugar beet plants cultivated with varying potassium/sodium ratios
作者:
Meinolf G. Lindhauer,
Hans E. Haeder,
Helmut Beringer,
期刊:
Zeitschrift für Pflanzenernährung und Bodenkunde
(WILEY Available online 1990)
卷期:
Volume 153,
issue 1
页码: 25-32
ISSN:0044-3263
年代: 1990
DOI:10.1002/jpln.19901530107
出版商: WILEY‐VCH Verlag
数据来源: WILEY
摘要:
AbstractCell 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−3K + 0.5 mol m−3Na (K plants) or 0.5 mol m−3K + 4.5 mol m−3Na (Na plants) or 0.5 mol m−3K + 0.5 mol m−3Na (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 assimilat
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