FIN219, an auxin-regulated gene, defines a link between phytochrome A and the downstream regulator COP1 in light control of Arabidopsis development

Article Abstract:

FIN219 has been found to determine a link between the downstream regulator COP1 and phytochrome A in light control in Arabidopsis development. FIN219 is an auxin-regulated gene. Plants must adapt to changing environments, light being on of the very important ones. Study findings suggest FIN219 may be a critical link for phytochrome A-mediated far-red inactivation of COP1. To find genes involved in light inactivation of COP1, a genetic screen was used to identify extragenic modifier mutations of a temperature-sensitive cop1 allele.

Japan, Statistical Data Included, Cytochemistry, Auxin, Auxins, Photoreceptors

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HFR1 encodes an atypical bHLH protein that acts in phytochrome A signal transduction

Article Abstract:

HFR1 has been found to encode an atypical bHLH protein. The protein acts in phytochrome A signal transduction. Phytochromes are photoreceptors plants use to adapt growth and development to light conditions. A new mutant, hfr1 (long hypocotyl in far-red) is described. IT shows reduction in seedling responsiveness to continuous far-red light (FRc). HFR1 may act to modulate phyA signaling via heterodimerization with PIF3. Abundance of HFR1 mRNA is far greater in FRc than in continuous red light. This suggests a potential mechanistic basis for the specificity of HFR1 to phyA signaling.

DNA, Plants, Cellular signal transduction, Genetic transcription, Transcription (Genetics), Plant cells and tissues, Plant cells, Plant cytogenetics, Gravity, Gravity (Force), Photomorphogenesis, Phototropism

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The COP1-SPA1 interaction defines a critical step in phytochrome A-mediated regulation of HY5 activity

Article Abstract:

Research has been conducted on Arabidopsis COP1-SPA1 interactions. The authors describe the characterization of these interactions at both genetic and biochemical levels.

Germany, Analysis, Biodegradation, Proteins, Genetic research, Ubiquitin

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