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  • Title: Phytochrome regulation of phytochrome A mRNA levels in the model short-day-plant Pharbitis nil.
    Author: Carter CE, Szmidt-Jaworska A, Hughes M, Thomas B, Jackson S.
    Journal: J Exp Bot; 2000 Apr; 51(345):703-11. PubMed ID: 10938862.
    Abstract:
    The exposure of dark-grown Pharbitis nil seedlings to continuous R induces a rapid decrease in PHYA mRNA abundance with a half-life of about 2 h. A 5 min R pulse also induces this decline, and the effect is partially reversible by subsequent FR irradiation, confirming that the regulation of expression is mediated via the Pfr form of a phytochrome. When de-etiolated seedlings are returned to darkness after a W photoperiod, PHYA mRNA slowly reaccumulates from 20% to 50% of the dark level within 24 h. The rate of reaccumulation is greatly accelerated by the removal of Pfr with a FR pulse, resulting in reaccumulation to 100% within approximately 11 h. Without FR irradiation PHYA mRNA expression remains fully repressed for at least 11 h after the end of the photoperiod, suggesting that the controlling Pfr is highly stable.
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