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• W1975875087 startingPage "e2699" @default.
• W1975875087 abstract "The psi2 mutant of Arabidopsis displays amplification of the responses controlled by the red/far red light photoreceptors phytochrome A (phyA) and phytochrome B (phyB) but no apparent defect in blue light perception. We found that loss-of-function alleles of the protein phosphatase 7 (AtPP7) are responsible for the light hypersensitivity in psi2 demonstrating that AtPP7 controls the levels of phytochrome signaling. Plants expressing reduced levels of AtPP7 mRNA display reduced blue-light induced cryptochrome signaling but no noticeable deficiency in phytochrome signaling. Our genetic analysis suggests that phytochrome signaling is enhanced in the AtPP7 loss of function alleles, including in blue light, which masks the reduced cryptochrome signaling. AtPP7 has been found to interact both in yeast and in planta assays with nucleotide-diphosphate kinase 2 (NDPK2), a positive regulator of phytochrome signals. Analysis of ndpk2-psi2 double mutants suggests that NDPK2 plays a critical role in the AtPP7 regulation of the phytochrome pathway and identifies NDPK2 as an upstream element involved in the modulation of the salicylic acid (SA)-dependent defense pathway by light. Thus, cryptochrome- and phytochrome-specific light signals synchronously control their relative contribution to the regulation of plant development. Interestingly, PP7 and NDPK are also components of animal light signaling systems." @default.
• W1975875087 created "2016-06-24" @default.
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• W1975875087 date "2008-07-16" @default.
• W1975875087 modified "2023-09-24" @default.
• W1975875087 title "The Protein Phosphatase 7 Regulates Phytochrome Signaling in Arabidopsis" @default.
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• W1975875087 doi "https://doi.org/10.1371/journal.pone.0002699" @default.
• W1975875087 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2444027" @default.
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