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Cell membrane stability, an indicator of drought tolerance, as affected by applied nitrogen in soyabean

Published online by Cambridge University Press:  27 March 2009

G. S. Premachandra ,
H. Saneoka  and
S. Ogata
G. S. Premachandra
Affiliation:
Laboratory of Plant Nutritional Physiology, Faculty of Applied Biological Science, Hiroshima University, Higashi- Hiroshima 724, Japan
H. Saneoka
Affiliation:
Laboratory of Plant Nutritional Physiology, Faculty of Applied Biological Science, Hiroshima University, Higashi- Hiroshima 724, Japan
S. Ogata
Affiliation:
Laboratory of Plant Nutritional Physiology, Faculty of Applied Biological Science, Hiroshima University, Higashi- Hiroshima 724, Japan
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Summary

Four soyabean cultivars were grown with two N application rates (50 and 300 kg N/ha) in the field at Hiroshima University, Japan, from June to August 1988. Cell membrane stability (CMS) by the polyethylene glycol (PEG) test, leaf water relations and nutrient concentrations in cell sap and leaf tissues were measured when the plants were 50 days old, in the uppermost fully expanded leaves.

Cell membrane stability was higher at the higher N rate, the increase over the lower rate being greater in the cultivars Lee+ and Lee–than in Tamahomare and T201. Leaf water potential was not affected by the higher rate of N application. Osmotic adjustment, which was independent of water stress, was observed with the higher rate of N and it was higher in Lee + and Lee–than in Tamahomare and T201. It is suggested that osmotic potential in leaf tissues may influence CMS measured by the PEG test. Solute concentrations in cell sap and leaf tissues were higher at the higher N rate. Sugar and K were the major contributors to osmotic potential.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 115 , Issue 1 , August 1990 , pp. 63 - 66
Copyright
Copyright © Cambridge University Press 1990

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