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Plant Physiology 66:500-504 (1980)
© 1980 American Society of Plant Biologists

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Phytochrome Modification and Light-enhanced, In Vivo-induced Phytochrome Pelletability 1,2

Maury L. Boeshore and Lee H. Pratt

Department of Botany, University of Georgia, Athens, Georgia 30602

Phytochrome that was induced by red irradiation in vivo to pellet with subcellular material and that was released from the pellet by removal of divalent cations exhibited altered characteristics. Compared to phytochrome extracted in a soluble red-absorbing form from etiolated tissue, pelleted and released phytochrome, which was also assayed in the red-absorbing form even though pelleted in the far-red-absorbing form, showed 50% greater micro complement fixation activity, eluted closer to the void volume of a Sephadex G-200 column, and electrophoresed more slowly on sodium dodecyl sulfate-polyacrylamide gels. Data presented here document that phytochrome pelleted in the far-red-absorbing form differs from soluble phytochrome extracted from nonirradiated tissue. These data, however, do not permit the conclusion that there is a causal relationship between pelletability and phytochrome modification.

1 This research was supported by National Science Foundation Grant PCM77-23584 (to L. H. P.).

2 A preliminary report of this work was presented at the Annual European Symposium on Photomorphogenesis, Aarhus, Denmark, 1978.




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R. Alba, M.-M. Cordonnier-Pratt, and L. H. Pratt
Fruit-Localized Phytochromes Regulate Lycopene Accumulation Independently of Ethylene Production in Tomato
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[Abstract] [Full Text]


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Copyright © 1980 by the American Society of Plant Biologists