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2,4‐Dichlorophenoxyacetic acid inhibition of potassium transport in barley seedlings
Author(s) -
François Guido,
Dewit Maria,
Neirinckx Louis
Publication year - 1983
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.1399-3054.1983.tb04222.x
Subject(s) - potassium , transpiration , hordeum vulgare , shoot , chromosomal translocation , chemistry , cell permeability , hordeum , botany , horticulture , biology , poaceae , biochemistry , photosynthesis , organic chemistry , gene
Growth, potassium uptake and translocation as well as transpiration rates were measured in intact low‐salt barley seedlings ( Hordeum vulgare L. cv. Union) in the presence of different 2,4‐D concentrations at pH 6.5. Growth was only affected at 10 ‐3 M . Above 10 ‐7 M 2,4‐D both uptake by the roots and transport to the shoots were inhibited. The inhibition at 10 ‐5 M remained constant for at least 24 h. Furthermore inhibition of uptake was measurable within 1 h. Excised roots and roots of intact plants showed the same uptake pattern. It is suggested that the observed effects were caused by 2,4‐D‐induced changes in uptake and translocation systems in the roots. Pre‐treatment with 10 ‐5 M 2,4‐D had no effect upon subsequent potassium uptake. Transpiration was reduced within 1 h in 10 ‐4 or 10 ‐3 M 2,4‐D, probably due to changes in water transport or root permeability.