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. 1973 Mar;51(3):474–477. doi: 10.1104/pp.51.3.474

Growth, Greening, and Phytochrome in Etiolated Spirodela (Lemnaceae)

Dan Porath 1, Yehuda Ben Shaul 1
PMCID: PMC366290  PMID: 16658354

Abstract

Two species of Spirodela were grown aseptically in a simple mineral medium containing sucrose. Weak red light (15 erg cm−2 sec−1) enhanced dark growth of S. oligorrhiza, whereas weak far red light (15 erg cm−2 sec−1) when given after the red light reduced this effect.

The lag period in chlorophyll accumulation (20-24 hours) could be shortened by a brief red light illumination, at both 25 C and 0 C, 12 to 24 hr before the exposure to continuous white light. The effect of red light in shortening the lag phase was diminished when high intensity of far red light (103−104 erg cm−2 sec−1) was given simultaneously with the red light.

Spectrophotometric studies showed detectable amounts of phytochrome in the plants, part of which decayed immediately during a short illumination by red light. The other relatively stable, phytochrome decayed only after prolonged illumination.

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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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