Light modulation of vegetative development.

Chory, Joanne

doi:10.1105/tpc.9.7.1225

Cited by 129 publications

(61 citation statements)

References 70 publications

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“…In contrast, seedlings during photomorphogenesis have a short hypocotyl, expanded and photosynthetic cotyledons, and continued cell proliferation and differentiation in the shoot apical meristem. The decision to follow one or the other pathway is reversible and controlled by photoreceptors of the phytochrome and cryptochrome families (reviewed in Quail et al, 1995;von Arnim and Deng, 1996;Cashmore, 1997;Chory, 1997).…”

Section: Introductionmentioning

confidence: 99%

Discrete Domains Mediate the Light-Responsive Nuclear and Cytoplasmic Localization of Arabidopsis COP1

Stacey¹,

Hicks²,

Arnim³

1999

The Plant Cell

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The Arabidopsis CONSTITUTIVE PHOTOMORPHOGENIC1 (COP1) protein plays a critical role in the repression of photomorphogenesis during Arabidopsis seedling development. We investigated the control of COP1 partitioning between nucleus and cytoplasm, which has been implicated in the regulation of COP1 activity, by using fusion proteins between COP1 and ␤ -glucuronidase or the green fluorescent protein. Transient expression assays using onion epidermal cells and data from hypocotyl cells of stably transformed Arabidopsis demonstrated that COP1 carries a single, bipartite nuclear localization signal that functions independently of light. Nuclear exclusion was mediated by a novel and distinct signal, bordering the zinc-finger and coiled-coil motifs, that was able to redirect a heterologous nuclear protein to the cytoplasm. The cytoplasmic localization signal functioned in a light-independent manner. Light regulation of nuclear localization was reconstituted by combining the individual domains containing the nuclear localization signal and the cytoplasmic localization signal; the WD-40 repeat domain of COP1 was not required. However, phenotypic analysis of transgenic seedlings suggested that the constitutively nuclear-localized WD-40 repeat domain was able to mimic aspects of COP1 function, as indicated by exaggerated hypocotyl elongation under light conditions.

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Section: Introductionmentioning

confidence: 99%

Discrete Domains Mediate the Light-Responsive Nuclear and Cytoplasmic Localization of Arabidopsis COP1

Stacey¹,

Hicks²,

Arnim³

1999

The Plant Cell

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“…Physiological and mutational analyses have shown that two of these, phyA and phyB, have distinct yet overlapping functions in the plant (reviewed in Elich and Chory, 1994;Whitelam and Harberd, 1994;McNellis and Deng, 1995;Quail et al, 1995;Chory, 1997;Whitelam and Devlin, 1997).…”

Section: Introductionmentioning

confidence: 99%

SPA1: A New Genetic Locus Involved in Phytochrome A–Specific Signal Transduction

1998

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To identify mutants potentially defective in signaling intermediates specific to phytochrome A (phyA), we screened for extragenic mutations that suppress the morphological phenotype exhibited by a weak phyA mutant ( phyA-105 ) of Arabidopsis. A new recessive mutant, designated spa1 (for suppressor of phyA-105 ), was isolated and mapped to the bottom of chromosome 2. spa1 phyA-105 double mutants exhibit restoration of several responses to limiting fluence rates of continuous far-red light that are absent in the parental phyA-105 mutant, such as deetiolation, anthocyanin accumulation, and a far-red light-induced inability of seedlings to green upon subsequent transfer to continuous white light. spa1 mutations do not cause a phenotype in darkness, indicating that the suppression phenotype is light dependent. Enhanced photoresponsiveness was observed in spa1 seedlings in a wild-type PHYA background as well as in the mutant phyA-105 background but not in a mutant phyA null background. These results indicate that phyA is necessary in a non-allele-specific fashion for the expression of the spa1 mutant phenotype and that phyB to phyE are not sufficient for this effect. Taken together, the data suggest that spa1 mutations specifically amplify phyA signaling and therefore that the SPA1 locus encodes a component that acts negatively early in the phyA-specific signaling pathway.

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“…11). As adults, these mutants are essentially the opposite of mutants lacking phyB, being dark green, slow-growing dwarfs with epinastic leaves, short stems and petioles, and delayed senescence (6).…”

mentioning

confidence: 99%

“…For example, genetic analysis between gibberellin (GA)-deficient and phytochrome mutants points to interactions between these two signal transduction systems (6), which may be caused, in part, by phytochrome's regulation of GA biosynthesis genes (7). Genetic analysis also implicates auxin in light signal transduction.…”

mentioning

confidence: 99%

BAS1 : A gene regulating brassinosteroid levels and light responsiveness in Arabidopsis

Neff

Nguyen

Malancharuvil

et al. 1999

Proc. Natl. Acad. Sci. U.S.A.

354

312

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The Arabidopsis bas1-D mutation suppresses the long hypocotyl phenotype caused by mutations in the photoreceptor phytochrome B (phyB). The adult phenotype of bas1-D phyB-4 double mutants mimics that of brassinosteroid biosynthetic and response mutants. bas1-D phyB-4 has reduced levels of brassinosteroids and accumulates 26-hydroxybrassinolide in feeding experiments. The basis for the mutant phenotype is the enhanced expression of a cytochrome P450 (CYP72B1). bas1-D suppresses a phyB-null allele, but not a phyA-null mutation, and partially suppresses a cryptochrome-null mutation. Seedlings with reduced BAS1 expression are hyperresponsive to brassinosteroids in a light-dependent manner and display reduced sensitivity to light under a variety of conditions. Thus, BAS1 represents one of the control points between multiple photoreceptor systems and brassinosteroid signal transduction.

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Light modulation of vegetative development.

Cited by 129 publications

References 70 publications

Discrete Domains Mediate the Light-Responsive Nuclear and Cytoplasmic Localization of Arabidopsis COP1

Discrete Domains Mediate the Light-Responsive Nuclear and Cytoplasmic Localization of Arabidopsis COP1

SPA1: A New Genetic Locus Involved in Phytochrome A–Specific Signal Transduction

BAS1 : A gene regulating brassinosteroid levels and light responsiveness in Arabidopsis

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