Carbohydrate and free amino acid contents in tomato plants grown in media with bicarbonate and nitrate or ammonium
2005
Bialczyk, J.,Jagiellonian University, Krakow (Poland). Dept. of Plant Physiology and Development | Lechowski, Z.,Swietokrzyska Academy, Kielce (Poland). Dept. of Plant Physiology | Dziga, D. | Molenda, K.,Jagiellonian University, Krakow (Poland). Dept. of Plant Physiology and Development
Tomato plants were cultivated (from 2 to 23 days after germination) in media with NO3− , NH4+ , or a mixture of both forms in different proportions used as the N source given with or without 5 mol/cubic dm HCO3− . The accumulation of soluble sugars (reducing sugars and sucrose) and free amino acids was higher in the roots and leaves of NH4+ -fed plants than in NO3- -fed plants. Starch accumulation in NH4+ -fed plants was higher in leaves (about 28 percent) and lower in roots (about 37 percent) in comparison with that of NO3- -fed plants. Plants cultivated in media containing a mixture of NO3- /NH4+ were characterized by a lower content of sugars and amino acids accumulation in comparison with that in plants fed with NO3− or NH4+ . An elevated HCO3- concentration in the rhizosphere stimulated the accumulation of soluble sugars and free amino acids in all the experimental variants. There were only small differences in the starch content
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