Plant Physiol.
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Plant Physiology 44:105-109 (1969)
© 1969 American Society of Plant Biologists

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Articles

Evidence for Bound Phytochrome in Oat Seedlings 1

Bernard Rubinstein2, K. Susan Drury3 and R. B. Park

a Department of Botany, University of California, Berkeley, California 94720

Phytochrome is consistently observed in pellets centrifuged from homogenates of etiolated, 5-day-old oat seedlings. The majority of pigment associated with the pellet cannot be removed by buffer washes, nor can appreciable quantities of additional phytochrome be adsorbed onto the sedimented material. Over 70% of phytochrome in the pellet is released by 1% Triton X-100.

Storage at 0°, irradiation by white light, and Triton treatment all cause much greater loss of photoreversibility in pelleted phytochrome than in supernatant phytochrome. We conclude that the phytochrome in the 1500 to 40,000g (30 min) pellet is distinct from the soluble phytochrome in the supernatant.

2 NASA Predoctoral Fellow. Present address: MSU/AEC Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48823.

3 National Science Foundation Predoctoral Fellow.

1 Supported in part by a grant from the National Institute of General Medical Sciences GM-13943-03.






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Copyright © 1969 by the American Society of Plant Biologists