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Particle-bound phytochrome: Spectral properties of bound and unbound fractions

✍ Scribed by Peter H. Quail

Publisher: Springer-Verlag
Year: 1974
Tongue: English
Weight: 589 KB
Volume: 118
Category: Article
ISSN: 0032-0935
DOI: 10.1007/bf00385584

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✦ Synopsis

In-vitro irradiation of extracts of maize (Zea mays L.) coleoptiles with red light enhances phytochrome pelletability as was previously reported for Cucurbita pepo L. In neither case is this the result of an irradiation-induced increase in the level of total pelletable protein. The transformation difference spectra of bound and unbound phytochrome fractions obtained after both in-vivo and in-vitro irradiations are not significantly different. The data, therefore, do not indicate that irradiation-enhanced pelletability either in rive or in vitro results from phytochromo denaturation. Other non-photoreversible changes in the molecule external to the chromophore environment might however still account for the observed pelletability.

* Abbreviations: Pfr = far-red-absorbing form of phytoehrome; Pr = red-absorbing form of phytochrome; Ptot ~ total phytoehrome. Rmax and FRmax = peak positions (nm) in the red and far-red regions of the difference spectrum respectively. R/2' ratio = A (AA) at Rmax/A (AA) at FRmax.

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