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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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Sahulka, J.; Lisa, L., 1979: Regulation of glutamine synthetase level in isolated pea roots. II. The effect of exogenously supplied acids and bases in sugar-supplied and sugar-starved roots. Exogenously supplied inorganic acids depressed glutamine synthetase level in isolated pea roots cultivated in media containing sucrose but not in media containing no sugar. The negative influence in sugar-supplied roots was not proportional to aci...

Sahulka, J.; Lisa, L., 1979: Regulation of glutamine synthetase level in isolated pea pisum sativum roots 1. differential effects of ammonium salts in sugar supplied roots. The effect of several ammonium salts on glutamine synthetase (GS) level in isolated P. sativum L. roots cultivated for 24 h in 2 different mineral media containing sucrose was investigated. Different ammonium salts can influence GS level different...

Sahulka, J.; Lisa, L., 1979: Regulation of glutamine synthetase level in isolated pea roots. I. Different effects of ammonium salts in sugar-supplied roots. The effect of several ammonium salts on glutamine synthetase level in isolated pea roots grown for 24 h in 2 different mineral media containing sucrose was investigated. Ammonium salts of strong inorganic acids depressed glutamine synthetase level...

Sahulka, J.L.sa, L., 1979: Regulation of glutamine synthetase level in isolated pea roots. I. Differential effects of ammonium salts in sugar-supplied roots. Biochemie und Physiologie der Pflanzen74(8): 646-652

Sahulka, J.; Lisa, L., 1978: The influence of exogenously supplied sucrose on glutamine synthetase and glutamate dehydrogenase levels in excised pisum sativum roots. Glutamine synthetase (GS) level is positively influenced by exogenously supplied sucrose in isolated pea roots (similarly as nitrate reductase - NR), glutamate dehydrogenase (GDH) level negatively. Comparison with previous results shows that GS le...

Sahulka J.; Gaudinova A.; Hadacova V., 1975: Regulation of glutamate dehydrogenase and nitrate reductase levels in excised pea roots by exogenously supplied sugar. Zeitschrift fuer Pflanzenphysiologie 75(5): 392-404

Vagner M.; Pospisil F.; Sahulka J., 1985: The effect of nitrite on glutamine synthetase level in isolated pisum sativum roots. Exposure of isolated pea roots to 0.5 and 2.0 mM nitrite resulted in a temporary decrease in glutamine synthetase (GS) level. The GS level decrease was preceded by a temporary increase in NO2- content: nitrite content maximum was observed after 6...

Vagner, M.; Pospisil, F.; Sahulka, J., 1985: The effect of nitrite on glutamine synthetase level in isolated Pisum sativum L. roots. Exposure of isolated pea cv. Dukat roots to 0.5 and 2 mM nitrite temporarily increased the nitrite level after 6 h and temporarily reduced the glutamine synthetase (GS) level after 12 h; at this time, GS was also significantly decreased by 0.3 and...

Sahulka J.; Lisa L., 1981: Differential effects of exogenous l glutamine l glutamic acid sodium glutamate and cas amino acids on glutamine synthetase and nitrate reductase in isolated pea pisum sativum roots cultured with or without sucrose. Exogenous L-glutamine, the sodium salt of L-glutamic acid and casamino acids did not decrease glutamine synthetase (GS) level in isolated pea (P. sativum L. cv. Jupiter and cv. Proteus) roots cultured with 20 g .cntdot. l-1 sucrose while L-glutami...

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