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  • 1
    Digitale Medien
    Digitale Medien
    Changes in blue-light-dependent protein phosphorylation during the early development of etiolated oat seedlings (1996)
    Springer
    Planta 199 (1996), S. 336-342 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Avena ; Photoreceptor ; Phototropism ; Plasma membrane ; Protein kinase ; Protein phosphorylation (blue-light-dependent)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Blue light induced the phosphorylation of a 116-kDa plasma-membrane-associated protein in dark-grown seedlings from Avena sativa L. The response was restricted to the phototropically sensitive tissue of the coleoptile tip. Surprisingly, this protein showed different properties in membrane preparations from plants that were grown for 3 d than in those from 5-d-old seedlings. In contrast to the younger coleoptiles, in 5-d-old seedlings phosphorylation of the 116-kDa protein depended strictly on the addition of Triton X-100 or other non-ionic detergents and was not abolished when the membranes were pretreated with trypsin. These latter membranes were also characterized by the appearance of two additional bluelight-regulated phosphoproteins of slightly lower molecular masses, exhibiting properties similar to the 116-kDa protein from 3-d-old plants. The data, together with solubilization studies, indicate that the 116-kDa protein is strongly membrane-bound only at the very beginning of seedling development and becomes more loosely associated in the course of coleoptile growth. In addition, we demonstrate that the capacity of the light-activated photoreceptor to recover photosensitivity in the dark also can occur under in-vitro conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00195724
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Chlorophyll b reduction during senescence of barley seedlings (1999)
    Springer
    Planta 209 (1999), S. 364-370 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Key words: Chlorophyllase ; Chlorophyll b reductase ; Hordeum ; 71-Hydroxy-chlorophyll a ; Leaf senescence
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract. During senescence of flowering plants, only breakdown products derived from chlorophyll a were detected although  b disappears, too (Matile et al., 1996, Plant Physiol 112: 1403–1409). We investigated the possibility of chlorophyll b reduction during dark-induced senescence of barley (Hordeum vulgare L.) leaves. Plastids isolated from senescing leaves were lysed and incubated with NADPH. We found 71-hydroxy-chlorophyll a, 71-hydroxy-chlorophyllide a, and, after incubation with Zn-pheophorbide b, also Zn-71-hydroxy-pheophorbide a, indicating activity of chlorophyll(ide) b reductase. The highest activity was found at day 2 of senescence when chlorophyll breakdown reached its highest rate. Chlorophyllase reached its highest activity under the same conditions only at days 4–6 of senescence. Based on the chlorophyll b reductase activity of plastids at day 2.5 of senescence (=100%), the bulk of activity (83%) was found in the thylakoids and only traces (5%) in the envelope fraction. Chlorophyll b reduction is considered to be an early and obligatory step of chlorophyll b breakdown.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004250050644
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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