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Effect of Salinity and Potassium on the Uptake of Nitrogen and on Nitrogen Metabolism in Young Barley Plants
Author(s) -
HELAL M.,
KOCH K.,
MENGEL K.
Publication year - 1975
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1975.tb03911.x
Subject(s) - salinity , soil salinity , potassium , nitrogen , chemistry , nutrient , saline , metabolism , zoology , hordeum vulgare , sodium , agronomy , biochemistry , biology , poaceae , endocrinology , ecology , organic chemistry
In a solution culture experiment with 4‐week‐old barley plants (variety Villa) the influence of NaCl salinization and of KCl additions on the uptake and turnover of labelled N ( 15 NH 4 15 NO 3 ) was studied. Labelled N was applied for 24 h at the end of the growth period. Salinization impaired growth and uptake of labelled N. The incorporation of labelled N into the protein fraction, however, was improved by NaCl salinization. Additions of KCl to the nutrient solution diminished the negative effect of NaCl salinization on growth. At both NaCl salinization levels (60 and 120 m M ) K additions favoured the uptake of labelled N and particularly its incorporation into the protein fraction. It is suggested that the negative influence of the NaCl stress is not primarily due to an impaired protein synthesis, but is possibly caused by a deterimental effect of Na on other metabolic processes.