Abolition of Posttranscriptional Regulation of Nit... Catalogue en ligne

Abolition of Posttranscriptional Regulation of Nitrate Reductase Partially Prevents the Decrease in Leaf NO, Reduction when Photosynthesis 1s lnhibited by C 0 2 Deprivation, but Not in Darkness / Laurence Lejay in Plant Physiology, 115 (1997)

[article]
inPlant Physiology > 115 (1997) . - 623-630

Titre :	Abolition of Posttranscriptional Regulation of Nitrate Reductase Partially Prevents the Decrease in Leaf NO, Reduction when Photosynthesis 1s lnhibited by C 0 2 Deprivation, but Not in Darkness
Type de document :	Imprimé
Auteurs :	Laurence Lejay ; Isabelle Quilleré ; Yvette Roux ; Pascal Tillard ; Jean-Bernard Cliquet ; Christian Meyer ; Jean-François Morot-Gaudry ; Alain Gojon
Année de publication :	1997
Article en page(s) :	623-630
Langues :	Anglais (eng)
Catégories :	[CBNPMP-Thématique] Physiologie végétale [CBNPMP-Thématique] Revégétalisation
Résumé :	The activity of nitrate reductase (NR) in leaves is regulated by light and photosynthesis at transcriptional and posttranscriptional levels. To understand the physiological role of these controls, we have investigated the effects of light and CO2 on in vivo NO3- reduction in transgenic plants of Nicotiana plumbaginifolia lacking either transcriptional regulation alone or transcriptional and posttranscriptional regulation of NR. The abolition of both levels of NR regulation did not modify the light/dark changes in exogenous 15NO3- reduction in either intact plants or detached leaves. The same result was obtained for 15N incorporation into free amino acids in leaves after 15NO3- was supplied to the roots, and for reduction of endogenous NO3- after transfer of the plants to an N-deprived solution. In the light, however, deregulation of NR at the posttranscriptional level partially prevented the inhibition of leaf 15NO3- reduction resulting from the removal of CO2 from the atmosphere We concluded from these observations that in our conditions deregulation of NR in the transformants investigated had little impact on the adverse effect of darkness on leaf NO3- reduction, and that posttranscriptional regulation of NR is one of the mechanisms responsible for the short-term coupling between photosynthesis and leaf NO3- reduction in the light.
Lien pérenne :	DOI : 10.1104/pp.115.2.623
Permalink :	https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=149443

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