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The influence of sugars on nitrate reductase induction by exogenous nitrate or nitrite in excised pisum sativum roots

  • Published:
Biologia Plantarum

Abstract

Nitrate reductase (NR) induction is enhanced by exogenously supplied sucrose in excised pea roots exposed to both exogenous nitrate and exogenous nitrite. NR synthesis is preferentially supported by sugars transported to the cells at the moment, however NR induction can take place for some time without exogenous sugar influx if roots are saturated with sugars during precultivation. Steady high NR levels are dependent on steady sugar and nitrate influxes. NR induction is low in roots precultivated for 20 h without sucrose although sugar content is still high in them. This suggests that compartmentation of sugars in the cells is of major importance during NR induction. Total nitrate content in roots exposed to nitrate is not influenced by sucrose supplied together with nitrate. Some nitrite is oxidized to nitrate in roots exposed to exogenous nitrite ; we assume that this nitrate is responsible for NR induction. Our results indicate that sugars, besides many indirect effects on NR induction, may also directly influence NR synthesis either as coinducers or as derepressors of NR synthesis. Our results further show that NR is not a product-inducible enzyme.

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  1. Institute of Experimental Botany, Czechoslovak Academy of Sciences, Ke dvoru 16/15, 166 30, Praha 6, Czechoslovakia

    J. Sahulka & Ludmila Lisá

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  1. J. Sahulka
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  2. Ludmila Lisá
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Sahulka, J., Lisá, L. The influence of sugars on nitrate reductase induction by exogenous nitrate or nitrite in excised pisum sativum roots. Biol Plant 20, 359–367 (1978). https://doi.org/10.1007/BF02923328

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  • DOI: https://doi.org/10.1007/BF02923328

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