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Factors Affecting Phytochrome Transcripts and Apoprotein Synthesis in Germinating Embryos of Avena sativa L.
BRIAN THOMAS, SUSAN E. PENN and BRIAN R. JORDAN
Journal of Experimental Botany
Vol. 40, No. 221 (December 1989), pp. 1299-1304
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/23691978
Page Count: 6
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Factors regulating phytochrome synthesis in germinating embryos of Avena sativa L. were investigated. The onset of phytochrome synthesis began about 16 h after imbibition. This coincided with a rapid increase in total protein synthesis associated with the onset of radicle growth as indicated by the incorporation of 35S-methionine. Phytochrome transcripts increased over the first 24 h of imbibition. A red light treatment at 14 h reduced transcript levels and this was partially far-red reversible. The effect of light did not involve changes in total protein synthesis or total mRNA levels and thus was specific for phytochrome apoprotein and transcripts. Inhibition of phytochrome apoprotein biosynthesis and transcript levels involved regulation by a stable fraction of Pfr. The data support the proposal that type 2 phytochrome regulates the synthesis of type 1 phytochrome at least partly through the mRNA level.
Journal of Experimental Botany © 1989 Oxford University Press