Title: The Inhibition of Phloem Translocation by Ammonia
Abstract:Bean plants (Phaseolus vulgaris L. cv. Fardenlosa Shiny) were labelled with carbon-11 via their first trifoliate leaves when 3-weeks-old and the transient inhibitions of translocation caused by the ap...Bean plants (Phaseolus vulgaris L. cv. Fardenlosa Shiny) were labelled with carbon-11 via their first trifoliate leaves when 3-weeks-old and the transient inhibitions of translocation caused by the application of ammonium chloride solutions (10 mol m−3) to a peeled region of stem were studied. At pH 6·5 the ammonium was without effect. At pH 11·0 even a brief application inhibited translocation for many minutes, while longer applications inhibited translocation for considerably longer. Solutions of 10 mol m−3 sodium chloride were without effect at either pH. At pH 6·5 ammonium chloride solution contains predominantly ammonium ions (NH4+) and at pH 11·0 predominantly dissolved ammonia gas (NH3). Hence we conclude that phloem transport within bean stems is inhibited by dissolved ammonia gas but not ammonium ions.Read More
Publication Year: 1992
Publication Date: 1992-01-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 4
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