ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Nitrite reductase  (3)
  • Springer  (3)
  • Wiley
  • 1
    Digitale Medien
    Digitale Medien
    Light-regulated expression of the nitrate-reductase and nitrite-reductase genes in tomato and in the phytochrome-deficient aurea mutant of tomato (1992)
    Springer
    Planta 188 (1992), S. 39-47 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Gene expression ; Lycopersicon ; Mutant (tomato, aurea) ; Nitrate reductase ; Nitrite reductase ; Phytochrome
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The phytochrome-deficient aurea mutant of tomato (Lycopersicon esculentum (L.) Mill) was used to investigate if phytochrome plays a role in the regulation of nitrate-reductase (NR, EC 1.6.6.1) and nitrite-reductase (NiR, EC 1.7.7.1) gene expression. We show that the expression of the tomato NR and NiR genes is stimulated by light and that this light response is mediated by the photoreceptor phytochrome. The red-light response of the NR and NiR genes was reduced in etiolated aurea seedlings when compared to isogenic wild-type cotyledons. The relative levels of NR mRNA and NiR transcripts and their diurnal fluctuations were identical in mature white-light-grown leaves of the wild-type and of the aurea mutant. The transcript levels for cab and RbcS (genes for the chlorophyll-a/b-binding protein of PSII and the small subunit of the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase, respectively) in aurea leaves grown in white light were indistinguishable from the respective transcript levels in the leaves of the wildtype grown under the same conditions. Despite a severe reduction in the chlorophyll content, the rate of net CO2 uptake by leaves of the aurea mutant was only slightly reduced when compared to the rate of net photosynthesis of wild-type leaves. This difference in the photosynthetic performances of wild-type and aurea mutant plants disappeared during aging of the plants. The increase in zeaxanthin and the concomitant decrease in violaxanthin in leaves of the aurea mutant compared with the same pigment levels in leaves of the wild-type indicate that the activity of the xanthophyll cycle is increased in aurea leaves as a consequence of the reduced CO2-fixation capacity of the mutant leaves.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00198937
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Light-regulated expression of the nitrate-reductase and nitrite-reductase genes in tomato and in the phytochrome-deficientaurea mutant of tomato (1992)
    Springer
    Planta 188 (1992), S. 39-47 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Gene expression ; Lycopersicon ; Mutant (tomato,aurea) ; Nitrate reductase ; Nitrite reductase ; Phytochrome
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The phytochrome-deficientaurea mutant of tomato (Lycopersicon esculentum (L.) Mill) was used to investigate if phytochrome plays a role in the regulation of nitrate-reductase (NR, EC 1.6.6.1) and nitrite-reductase (NiR, EC 1.7.7.1) gene expression. We show that the expression of the tomato NR and NiR genes is stimulated by light and that this light response is mediated by the photoreceptor phytochrome. The red-light response of the NR and NiR genes was reduced in etiolatedaurea seedlings when compared to isogenic wild-type cotyledons. The relative levels of NR mRNA and NiR transcripts and their diurnal fluctuations were identical in mature white-light-grown leaves of the wild-type and of theaurea mutant. The transcript levels forcab andRbcS (genes for the chlorophyll-a/b-binding protein of PSII and the small subunit of the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase, respectively) inaurea leaves grown in white light were indistinguishable from the respective transcript levels in the leaves of the wildtype grown under the same conditions. Despite a severe reduction in the chlorophyll content, the rate of net CO2 uptake by leaves of theaurea mutant was only slightly reduced when compared to the rate of net photosynthesis of wild-type leaves. This difference in the photosynthetic performances of wild-type andaurea mutant plants disappeared during aging of the plants. The increase in zeaxanthin and the concomitant decrease in violaxanthin in leaves of theaurea mutant compared with the same pigment levels in leaves of the wild-type indicate that the activity of the xanthophyll cycle is increased inaurea leaves as a consequence of the reduced CO2-fixation capacity of the mutant leaves.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01160710
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Two nitrite reductase isoforms are present in tomato cotyledons and are regulated differently by UV-A or UV-B light and during plant development (1998)
    Springer
    Planta 207 (1998), S. 229-234 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Key words: Gene expression ; Isoenzyme ; Light-regulation ; Lycopersicon ; Nitrite reductase ; Ultraviolet light
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract. The regulation by UV-A or UV-B light of the nuclear gene(s) encoding the plastidic enzyme nitrite reductase (NiR; EC 1.7.7.1) was examined in the cotyledons of tomato (Lycopersicon esculentum L.). Two NiR isoforms designated NiR1 and NiR2 with apparent molecular masses of 63 kDa and 62 kDa, respectively, were detected by immunoblot analysis in total soluble protein extracts derived from tomato seedling cotyledons. Genomic Southern blot analysis indicated the presence of two NiR genes per haploid tomato genome. In etiolated tomato cotyledons, the total NiR protein pool was almost exclusively constituted by NiR1. In contrast, NiR2 was the predominant NiR isoform in the cotyledons of tomato seedlings grown in white light. Illumination of etiolated tomato cotyledons with UV-A or UV-B light resulted in an increase in both the total NiR transcript level and the NiR2 protein abundance. Blue light stimulated the NiR2 protein pool above the level obtained with red light of equal photon fluence rate. These results show that NiR2 protein expression is light-inducible and that the light-stimulation of NiR2 protein accumulation involves the action of both phytochrome and a specific blue-light photoreceptor. The NiR1 protein level remained virtually unaffected by the light treatments. The change in the relative proportion of the NiR isoforms during greening of etiolated tomato cotyledons is, therefore, due to the different light-responsiveness of the genes corresponding to NiR1 or NiR2. The physiological significance of the presence of NiR isoforms that are regulated differently by light in tomato cotyledons is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004250050477
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...