Carbohydrate and free amino acid contents in tomato plants grown in media with bicarbonate and nitrate or ammonium

Physiological responses of Catharanthus roseus to different nitrogen forms

“…We found that plants in N2 nitrogen solution maintained a stably higher level of Suc irrespective of time. This result suggests that the N2 solution might induce an elevated carbon available to assimilate excess ammonium in the root and leaf when plants were placed in ammonium nitrate solution (Schortemeyer et al 1997;Bialczyk et al 2005;Ruan et al 2007). The increased carbon source capacity in the leaf likely interprets the up-regulations of Pn at 7 days in plants in N2 nitrogen solution.…”

“…4b). To protect plants from the toxicity of excess amount of ammonium, the free ammonium should be incorporated into other parts of amino acids containing more N/C ratio, such as glutamine, asparagine, Pro and Thr (Britto et al 2001;Bialczyk et al 2005;Skopelitis et al 2006;Calatayud et al 2008). In accordance with this interpretation, we found that Pro and Thr were largely improved in plants fed with N2 or N3 nitrogen solution after 7 days of treatment.…”

“…Ammonium toxicity symptoms can be alleviated, sometimes exhibiting synergistic growth response in many plants by co-provision of NO 3 - Bialczyk et al 2005;Tabatabaei et al 2008). Rice plants were revealed to have a 40-70% increase in biomass accumulation if co-provided with NH 4 ?…”

CO 2 enrichment modulates ammonium nutrition in tomato adjusting carbon and nitrogen metabolism to stomatal conductance

“…Viktor and Cramer [11] reported a significant increase in the biomass of tomato plants in response to increased root-zone CO 2 concentration, for plants supplied with both nitrate and ammonium nutritions. Also, dissolved inorganic carbon supply in the rhizosphere allowed an intensified amino acids synthesis in tomato roots [12]. In the same way, root inorganic carbon enrichment alleviated ammonium toxicity in cucumber plants, increasing NH 4 + assimilation and N export to the shoot [4].…”

l‐cysteine desulfhydrase‐related H2S production is involved in OsSE5‐promoted ammonium tolerance in roots of Oryza sativa

“…The abundance of many free amino acids such as Glu and Asp was increased when NH 4 + is excessively supplied, which is regarded as an important detoxification strategy with the channelling of excess ammonia into essential metabolic processes and defence compounds. (Tapia et al 1996;Bialczyk et al 2005).…”