Phytochrome Photoconversion in Vivo1: Comparison between Measured and Predicted Rates
AUTOR(ES)
Mancinelli, Alberto L.
RESUMO
The measured rates of phytochrome photoconversion in vivo, in etiolated cabbage (Brassica oleracea L.) seedlings and cucumber (Cucumis sativus L.) cotyledons, under blue, red, and far red irradiation, are significantly different from those predicted on the basis of the spectral photon flux distributions of the light sources and optical parameters of purified phytochrome. The geometrical relationships between the light source and the irradiated sample affect the rate of phytochrome photoconversion, which is significantly faster in cabbage seedling laying flat on white, wet filter paper than in seedlings in a vertical position. Light reflected from the white filter paper on the bottom of the dish contributes significantly to phytochrome photoconversion. Substituting the white filter paper with a less reflective black one results in a significant decrease of the rate of phytochrome photoconversion in cucumber cotyledons.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1054563Documentos Relacionados
- Nonphotochemical Transformations of Phytochrome in Vivo 1
- Predicted and measured aminoglycoside pharmacokinetic parameters in critically ill patients.
- Dark Transformations of Phytochrome in vivo. II 1
- Relationship between in vivo degradative rates and isoelectric points of proteins.
- Identification with Monoclonal Antibodies of a Second Antigenic Domain on Avena Phytochrome that Changes upon Its Photoconversion 1