Abstract
Gravitropic orientation and the elongation of etiolated hypocotyls are both regulated by red light through the phytochrome family of photoreceptors. The importance of phytochromes A and B (phyA and phyB) in these red light responses has been established through studies using phy mutants. To identify the roles that phytochromes play in gravitropism and elongation of roots, we studied the effects of red light on root elongation and then compared the gravitropic curvature from roots of phytochrome mutants of Arabidopsis (phyA, phyB, phyD and phyAB) with wild type. We found that red light inhibits root elongation approximately 35% in etiolated seedlings and that this response is controlled by phytochromes. Roots from dark- and light-grown double mutants (phyAB) and light-grown phyB seedlings have reduced elongation rates compared with wild type. In addition, roots from these seedlings (dark/light-grown phyAB and light-grown phyB) have reduced rates of gravitropic curvature compared with wild type. These results demonstrate roles for phytochromes in regulating both the elongation and gravitropic curvature of roots.
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Claims 5
Claim · model-written summary
Red light inhibited root elongation by approximately 35% in etiolated seedlings.
- Taxon
- Arabidopsis
Arabidopsise1 - Organ / stage
- etiolated seedlingse0
- Treatment
- red lighte0
- Outcome
- root elongatione0
- Direction
- inhibitse0
- Value
- approximately 35%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“red light inhibits root elongation approximately 35% in etiolated seedlings”
e1“Arabidopsis (phyA, phyB, phyD and phyAB) with wild type”
Claim · model-written summary
Dark- and light-grown phyAB roots elongated more slowly than wild type roots.
Not reportedTaxon
Verbatim
e0“Roots from dark- and light-grown double mutants (phyAB) and light-grown phyB seedlings have reduced elongation rates compared with wild type.”
Claim · model-written summary
Light-grown phyB roots elongated more slowly than wild type roots.
Not reportedTaxon
Verbatim
e0“Roots from dark- and light-grown double mutants (phyAB) and light-grown phyB seedlings have reduced elongation rates compared with wild type.”
Claim · model-written summary
Dark- and light-grown phyAB roots had reduced rates of gravitropic curvature versus wild type.
Not reportedTaxon
Verbatim
e0“roots from these seedlings (dark/light-grown phyAB and light-grown phyB) have reduced rates of gravitropic curvature compared with wild type.”
Claim · model-written summary
Light-grown phyB roots had reduced rates of gravitropic curvature versus wild type.
Not reportedTaxon
Verbatim
e0“roots from these seedlings (dark/light-grown phyAB and light-grown phyB) have reduced rates of gravitropic curvature compared with wild type.”
The same questions in other papers
light · growth · ArabidopsisResults differ
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- positive
- positive
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