Nitrate uptake and utilization is modulated by exogenous γ-aminobutyric acid in Arabidopsis thaliana seedlings

γ-Aminobutyric acid (GABA) priming enhances the osmotic stress tolerance in Piper nigrum Linn. plants subjected to PEG-induced stress

“…Therefore the merit of GABA priming lies in the fact that, the metabolites and energy for equipping the defense arsenal gets utilized only when the plants meet with osmotic stress. Likewise, the highly enhanced level of GABA content in primed plants subjected to PEG-stress (compared to all other treatments) indicate that priming with GABA stimulate the endogenous synthesis of GABA, which perform the role as metabolite as well as signaling molecule as opined by Bouche and Fromm (2004), Barbosa et al (2010) and thus enabling the plants to activate the defense responses quickly and more effectively when they are encountered with stress.…”

“…Priming by exogenous application of c-aminobutyric acid (GABA) has been proven to influence some physiological activities in certain plants for defending various abiotic stresses (Barbosa et al 2010;Shi et al 2010;Song et al 2010;Nayyar et al 2013;Malekzadeh et al 2012Malekzadeh et al , 2014. In plants, GABA is synthesized endogenously and is involved in various metabolic activities.…”

“…GABA shunt is a metabolic pathway operated through various enzymes that synthesize or catabolize GABA. It helps to maintain C:N balance in plants; which is made possible by sensing and regulating internal sugar levels and/or nitrogen containing compounds (Kinnersley and Turano 2000;Bouche and Fromm 2004;Bor et al 2009;Barbosa et al 2010). In addition to its role as a metabolite, GABA is suspected to function as signaling molecule during stressful conditions (Serraj et al 1998).…”

Does GABA increase the efficiency of symbiotic N2fixation in legumes?

“…28 In Arabidopsis thaliana, signaling and specific metabolic functions of GABA have been provided in connection with nitrate metabolism. 35 Exogenous GABA application strongly affected the regulation of nitrate uptake and metabolism in Arabidopsis seedlings. Additionally, the activity of nitrate reductase, glutamate synthase, phosphoenolpyruvate carboxylase and other enzymes involved in nitrogen and carbon metabolism were found regulated by exogenous application of GABA.…”

Contribution of Gamma amino butyric acid (GABA) to salt stress responses of Nicotiana sylvestris CMSII mutant and wild type plants

“…GABA metabolism has different functions in plant metabolism including osmotic and pH regulation, pollen tube growth and guidance, bypass of the tricarboxylic acid (TCA) cycle, C:N balance, nitrogen metabolism, and preventing the accumulation of reactive oxygen species under different environmental Abbreviations: DTT, dithiothreitol; EDTA, ethylenediamine-N,N,N ,N -tetraacetic acid; GS, glutamine synthetase; GOGAT, glutamate synthase; 2-OG, 2-oxoglutarate; PVPP, polyvinylpolypyrrolidone; SSA, succinic semialdehyde; TCA, tricarboxylic acid; TMV, tobacco mosaic virus. stresses (Snedden et al, 1996;Kinnersley and Turano, 2000;Ansari and Chen, 2009;Barbosa et al, 2010;Renault et al, 2010). Moreover, GABA, a well known neurotransmitter in mammalian brain tissues is also suggested to be a signaling molecule in plants (Fait et al, 2006(Fait et al, , 2008.…”