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A computer simulation of aggregated phytochrome photoconversion
Author(s) -
Ninković V.,
Obrenović S.
Publication year - 2000
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1034/j.1399-3054.2000.108003330.x
Subject(s) - phytochrome , dimer , kinetics , biophysics , far red , monomer , blue light , phytochrome a , red light , chemistry , transduction (biophysics) , botany , biology , biochemistry , physics , optics , arabidopsis , gene , mutant , organic chemistry , quantum mechanics , polymer
In order to check the relevance of possible phytochrome aggregation forms for the diversity of action spectra and dose‐response curves for light sensing by plants, a model for phytochrome photoconversion was produced for different aggregates. Under saturating light treatments, a computer simulation of dimer and aggregated dimer (tetramers and hexamers) photoconversion provided similar compositions of various aggregates in red and green light, which differed from blue and far‐red light. These aggregates could account for the variable action spectra only if the nature of the primary transducing components is taken into account. The initial kinetics of aggregated phytochrome appear to be slower in comparison to the monomeric form, and there were transient peaks of certain aggregates in red and green light. A single peak occurred under blue light, but not in far‐red, only if dimers are aggregated into tetramers and hexamers. This finding suggests that the initial kinetics of aggregated phytochrome are not sufficient to account for the variable dose‐response curves in light‐mediated responses by plants, so again the feature of signal transduction components may play a decisive role.