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Volume 8, Issue 3, Pages 479-481 (March 2015) A cop1 spa Mutant Deficient in COP1 and SPA Proteins Reveals Partial Co-Action of COP1 and SPA during Arabidopsis Post-Embryonic Development and Photomorphogenesis Natalia Ordoñez-Herrera, Petra Fackendahl, Xu Yu, Sabine Schaefer, Csaba Koncz, Ute Hoecker Molecular Plant Volume 8, Issue 3, Pages 479-481 (March 2015) DOI: 10.1016/j.molp.2014.11.026 Copyright © 2015 The Author Terms and Conditions

Figure 1 Phenotypes of a spa Quadruple Null Mutant (spaQn), a spaQn cop1-5 Quintuple Null Mutant Deficient in All Four SPAs and COP1, and a spaQn cop1-4 Quintuple Mutant Expressing Only a Truncated COP1 Protein Lacking the WD-Repeat Domain. (A) spaQn quadruple mutants are viable, dwarfed plants. spaQn mutants carry null alleles at all four SPA loci. spaQ mutants carry previously described spa alleles that are, in part, not null. Plants were grown in long days for 3 weeks. The insets show 5× magnifications of spaQ and spaQn plants. WT, wild-type. (B) spaQn seedlings undergo constitutive photomorphogenesis but appear more purple than spaQ mutants. spaQ and spaQn mutant seedlings were grown in darkness for 5 days. The black bar indicates 1 mm. (C) SPA1 and SPA4 are the primary SPA genes controlling photoperiodic flowering. Flowering time was determined in spa triple mutants carrying SPA null alleles and in Col wild-type (WT) grown in short days (SD). (D) spaQn mutants flower constitutively early in short days (SD) and long days (LD). Asterisks indicate significant differences (P < 0.001). (E) Quintuple spaQn cop1-5 mutants devoid of COP1 and all four SPA proteins are capable of completing embryogenesis. Seedlings of the indicated homozygous genotypes were grown in darkness for 6 days or in white light (Wc, 25 μmol m−2 s−1) for 4 days. The black bar indicates 1 mm. (F) The WD-repeat domain of SPA proteins can partially replace a missing WD-repeat domain in COP1. cop1-4 produces a truncated COP1 protein lacking the WD-repeat domain. Seedlings of the indicated homozygous genotypes were grown in darkness or white light (Wc, 25 μmol m−2 s−1) for 4 days. The black bar indicates 1 mm. Molecular Plant 2015 8, 479-481DOI: (10.1016/j.molp.2014.11.026) Copyright © 2015 The Author Terms and Conditions