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Regulation of glutamine synthetase level in isolated pea pisum sativum roots 2. the effect of exogenously supplied acids and bases in sugar supplied and sugar starved roots

, : Regulation of glutamine synthetase level in isolated pea pisum sativum roots 2. the effect of exogenously supplied acids and bases in sugar supplied and sugar starved roots. Biochemie und Physiologie der Pflanzen (BPP) 174(8): 653-659

Exogenously supplied inorganic acids depress glutamine synthase (GS) level in isolated pea roots cultivated in media containing sucrose but do not enhance the decrease in GS level caused by sugar starvation. The negative influence in sugar-supplied roots is not proportional to acid concentration. Bases including NH4OH counteract the negative effect of acids in sugar-supplied roots and the negative effect of NH4Cl. When applied alone, NH4OH does not influence GS level in sugar-supplied roots differently from KOH with the exception of low concentrations. In sugar-starved roots KOH does not affect GS level whereas NH4OH enhances the decrease caused by lack of sugar. There is no substantial difference between the effects of NH4Cl and (NH4)2HPO4 in sugar-starved roots; both salts significantly enhance the decrease in GS level with the depressing effect being accompanied by a decrease in the content of reducing sugars. These results confirm an earlier finding that the negative effect of ammonium salts of strong inorganic acids in sugar-supplied roots is mediated by increased H+ concentration in the cells which counteracts the positive effect of sugars, and suggest that in sugar-starved roots ammonium salts and ammonia enhance the decrease in GS level by enhancing sugar consumption. Some unknown factor(s) with positive effects on GS may be released in pea roots by increased H+ concentration.

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