Effects of exposure to ammonium and transplant shock upon the induction of nitrate absorption

In barley (Hordeum vulgare L. cv Steptoe) seedlings, the time course for induction of root nitrate absorption varied significantly with pretreatment. Net nitrate uptake of nitrogen-deprived plants more than doubled during the 12 hours after first exposure to nitrate. For these plants, gentle physica...

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Bibliographic Details
Published inPlant physiology (Bethesda) Vol. 94; no. 1; pp. 85 - 90
Main Authors Bloom, A.J. (University of California, Davis, CA), Sukrapanna, S.S
Format Journal Article
LanguageEnglish
Published Rockville, MD American Society of Plant Physiologists 01.09.1990
Subjects
ABSORCION
ABSORPTION
Barley
Biological and medical sciences
Cell physiology
Electrodes
Fundamental and applied biological sciences. Psychology
HORDEUM VULGARE
INHIBICION
INHIBITION
NITRATE
Nitrates
NITRATOS
Nitrogen
Nutrient solutions
PERMEABILIDAD
PERMEABILITE
Plant physiology and development
Plant roots
Plants
PLANTULAS
PLANTULE
Plasma membrane and permeation
Pretreatment
Quaternary ammonium compounds
RACINE
RAICES
REPIQUAGE
Seedlings
TRASPLANTE
Monocotyledones
Ammonium
Hordeum vulgare
Root
Nitrates
Cereal crop
Absorption
Gramineae
Angiospermae
Spermatophyta
Kinetics
Pretreatment
Potassium
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Summary:In barley (Hordeum vulgare L. cv Steptoe) seedlings, the time course for induction of root nitrate absorption varied significantly with pretreatment. Net nitrate uptake of nitrogen-deprived plants more than doubled during the 12 hours after first exposure to nitrate. For these plants, gentle physical disturbance of the roots inhibited net nitrate absorption for more than 6 hours and potassium absorption for 2 hours. Pretreatment with ammonium appeared sufficient to induce nitrate absorption; plants either grown for 2 weeks on or exposed for only 10 hours to a medium containing ammonium as a sole nitrogen source showed high rates of net nitrate uptake when first shifted to a medium containing nitrate. Gentle physical manipulation of these plants inhibited nitrate absorption for 2 hours and potassium absorption for more than 12 hours. These results indicate (a) that experimental protocols should avoid physical manipulation of the roots whenever possible and (b) that ammonium or a product of ammonium assimilation can induce nitrate absorption
Bibliography:F60
9102808
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.94.1.85