Phytochrome Control of Its Own Synthesis in Pisum sativum

Rapid transcriptional regulation by phytochrome of the genes for phytochrome and chlorophyll a/b-binding protein in Avena sativa.

“…The phy gene has become a useful model for investigating phytochrome regulation of gene expression (7,8,18,34,44,45). The data on phy gene regulation presented here provide the first evidence for direct control of transcription of a gene by the phytochrome transduction chain.…”

Protein Farnesyltransferase in Plants (Molecular Cloning and Expression of a Homolog of the [beta] Subunit from the Garden Pea)

“…We do not yet know the physiological significance of this change, or whether this change is directly induced by light or is a result of developmental changes mediated by light. Nevertheless, it is interesting to note that down-regulation of gene expression by light has been reported for other regulatory proteins in peas, including phytochrome (Otto et al, 1984;Sato, 1988) and putative protein kinases (Lin et al, 1991). Moreover, the 3' untranslated region of the pea FTase transcript contains two copies of the AUUUA motif.…”

Regulation of Phytochrome Message Abundance in Root Caps of Maize

“…The magnitude of the previously observed decreases in message levels ranged from 10-to 20-fold reductions in oats (3) and pea (19) to approximately 5-fold in rice (10) and only a 2-fold decrease in zucchini ( 12). In each of these cases, the samples examined included etiolated shoot tissue.…”

“…It is well established that the message level for phytochrome is regulated by a light-dependent mechanism which itself is phytochrome-mediated in oat (3) and in pea (19). Since the consequence ofthe light regulation is a decrease in abundance of phytochrome mRNA, this phenomenon is referred to as negative autoregulation.…”