Abstract
Plant morphogenesis is dependent on a tight control of cell division and expansion. Cell elongation during post-embryonic hypocotyl growth is under the control of a light-regulated developmental switch. Light is generally believed to exert its effects on hypocotyl elongation through a phytochrome-and blue-light receptor-mediated inhibitory action on a so far unknown cell elongation mechanism. We describe here a new class of allelic mutants in Arabidopsis, at the locus PROCUSTE1 (prc1-1 to -4), which have a hypocotyl elongation defect specifically associated with the dark-grown development program. Normal hypocotyl elongation is restored in plants grown in white, blue or red light. In agreement with this, the constitutive photomorphogenic mutation cop1-6, which induces a de-etiolated phenotype in the dark, is epistatic to prc1-2 for the hypocotyl phenotype. Epistasis analyses in red and blue light respectively, indicate that phytochrome B but not the blue light receptor HY4, is required for the switch from PRC1-dependent to PRC1-independent elongation. The conditional hypocotyl growth defect is associated with a deformation of the hypocotyl surface due to an uncontrolled swelling of epidermal, cortical or endodermal cells, suggesting a defect in the structure of the expanding cell wall. A similar phenotype was observed in elongating roots, which was however, independent of the light conditions. The aerial part of mature mutant plants grown in the light was indistinguishable from the wild type. prc1 mutants provide a means of distinguishing, for the first time, two genetic pathways regulating hypocotyl cell elongation respectively in dark- and light-grown seedlings, whereby light not only inhibits hypocotyl growth, but also activates a PRC1-independent cell elongation program.
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Claims 8
Claim · model-written summary
prc1 mutants have a dark specific hypocotyl elongation defect.
- Taxon
- Arabidopsis
Arabidopsise0 - Material
- prc1-1 to -4e0
- Organ / stage
- hypocotyle0
- Gene
- PROCUSTE1e0
- Outcome
- hypocotyl elongation defecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“allelic mutants in Arabidopsis, at the locus PROCUSTE1 (prc1-1 to -4), which have a hypocotyl elongation defect specifically associated with the dark-grown development program”
Claim · model-written summary
White, blue or red light restores normal hypocotyl elongation.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- white, blue or red lighte0
- Outcome
- hypocotyl elongatione0
- Direction
- restorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Normal hypocotyl elongation is restored in plants grown in white, blue or red light”
t0“Arabidopsis seedlings”
Claim · model-written summary
cop1-6 is epistatic to prc1-2 for the hypocotyl phenotype.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- cop1-6e0
- Outcome
- hypocotyl phenotypee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cop1-6, which induces a de-etiolated phenotype in the dark, is epistatic to prc1-2 for the hypocotyl phenotype”
t0“Arabidopsis seedlings”
Claim · model-written summary
Phytochrome B is required for the light dependent switch in elongation.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- phytochrome Be0
- Outcome
- switch from PRC1-dependent to PRC1-independent elongatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phytochrome B but not the blue light receptor HY4, is required for the switch from PRC1-dependent to PRC1-independent elongation”
t0“Arabidopsis seedlings”
Claim · model-written summary
HY4 is not required for the switch.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- HY4e0
- Outcome
- switch from PRC1-dependent to PRC1-independent elongatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phytochrome B but not the blue light receptor HY4, is required for the switch from PRC1-dependent to PRC1-independent elongation”
t0“Arabidopsis seedlings”
Claim · model-written summary
Mutant hypocotyl surfaces deform through cell swelling.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- hypocotyle0
- Outcome
- deformation of the hypocotyl surfacee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deformation of the hypocotyl surface due to an uncontrolled swelling of epidermal, cortical or endodermal cells”
t0“Arabidopsis seedlings”
Claim · model-written summary
Roots showed a similar phenotype regardless of light.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- elongating rootse0
- Outcome
- similar phenotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A similar phenotype was observed in elongating roots, which was however, independent of the light conditions”
t0“Arabidopsis seedlings”
Claim · model-written summary
Mature aerial mutant plants resembled wild type.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- aerial part of mature mutant plantse0
- Comparator
- wild typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The aerial part of mature mutant plants grown in the light was indistinguishable from the wild type”
t0“Arabidopsis seedlings”
The same questions in other papers
light · growth · ArabidopsisResults differ
26 papers in the same direction as this paper · 16 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- no effect
40 papers more in this group
See all 44 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.