Enhancement of nitrate uptake and growth of barley seedlings by calcium under saline conditions

The effect of Ca2+ on NO3 - assimilation in young barley (Hordeum vulgare L. var CM 72) seedlings in the presence and absence of NaCl was studied. Calcium increased the activity of the NO3 - transporter under saline conditions, but had little effect under nonsaline conditions. Calcium decreased the...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1986-02, Vol.80 (2), p.520-524
Main Authors: Ward, M.R, Aslam, M, Huffaker, R.C
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Barley
Biological and medical sciences
Biological Transport
Calcium
Calcium - pharmacology
Cations
Chemical agents
CRECIMIENTO
CROISSANCE
Economic plant physiology
Fertilizers
Fundamental and applied biological sciences. Psychology
GROWTH
Hordeum - drug effects
Hordeum - growth & development
Hordeum - metabolism
HORDEUM VULGARE
Hydroponics
ION UPTAKE
Kinetics
Magnesium - pharmacology
Man/System Technology And Life Support
Manganese - pharmacology
Mineral nutrition
NITRATE
NITRATES
Nitrates - pharmacokinetics
NITRATOS
Nutrient solutions
Nutrition. Photosynthesis. Respiration. Metabolism
Plant growth
Plant physiology and development
Plant roots
Plants
PLANTULAS
PLANTULE
SALINIDAD
SALINITE
SALINITY
SEEDLINGS
Sodium Chloride - pharmacology
Space life sciences
Vegetative apparatus, growth and morphogenesis. Senescence
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Summary:The effect of Ca2+ on NO3 - assimilation in young barley (Hordeum vulgare L. var CM 72) seedlings in the presence and absence of NaCl was studied. Calcium increased the activity of the NO3 - transporter under saline conditions, but had little effect under nonsaline conditions. Calcium decreased the induction period for the NO3 - transporter under both saline and nonsaline conditions but had little effect on its apparent Km for NO3 - both in the presence and absence of NaCl. The enhancement of NO3 - transport by Ca2+ under saline conditions was dependent on the presence of Ca2+ in the uptake solution along with the salt, since Ca2+ had no effect when supplied before or after salinity stress. Although Mn2+ and Mg2+ enhanced NO3 - uptake under saline conditions, neither was as effective as Ca2+. In longer studies, increasing the Ca2+ concentration in saline nutrient solutions resulted in increases in NO3 - assimilation and seedling growth.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.80.2.520