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. 1968 Jan;43(1):88–92. doi: 10.1104/pp.43.1.88

Stable Concentrations of Phytochrome in Pisum Under Continuous Illumination with Red Light 1

David T Clarkson a,2, William S Hillman a
PMCID: PMC396016  PMID: 16656742

Abstract

In vivo spectrophotometry showed that the phytochrome concentration in pea epicotyl hooks decreased at a constant rate for 4 hours when the tissue was exposed to continuous red light. Thereafter the rate slowed progressively so that a steady concentration of phytochrome was approached at hour 7. Returning the plants to darkness resulted in an increase in phytochrome due to the apparent synthesis of PR. A closely similar pattern of changes was found in the amount of phytochrome extracted from the tissue. The establishment of the stable concentration was inhibited by 2,4-dichlorophenoxyacetic acid and did not occur in segments which had been incubated for longer than 24 hours, but was observed when segment growth was inhibited by mannitol. The results may be explained by an equilibrium between PFR destruction and apparent PR synthesis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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