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Dissecting the biosynthetic pathway for the bypass1 root-derived signal
Jaimie M Van Norman1, Leslie E Sieburth
1Department of Biology, University of Utah, Salt Lake City, UT 84112, USA.
The Plant Journal : for Cell and Molecular Biology
|January 16, 2007
Summary
Arabidopsis roots produce a novel mobile signal derived from carotenoids that impacts both root and shoot development. This signal
Area of Science:
- Plant biology
- Molecular genetics
- Developmental biology
Background:
- The Arabidopsis BYPASS1 (BPS1) gene is crucial for normal root and shoot growth.
- bps1 mutants exhibit a transmissible signal from roots that halts shoot development.
- Previous studies suggested a mobile carotenoid-derived signal influences both root and shoot development.
Purpose of the Study:
- Further characterize the root-derived signal in bps1 mutants.
- Investigate the signal's chemical nature and biosynthetic pathway.
- Determine if the signal is abscisic acid or another known hormone.
Main Methods:
- Genetic analysis of double mutants combining bps1 with carotenoid processing mutants.
- Use of biosynthetic inhibitors like fluridone and CPTA.
- Assessment of leaf and root development in various mutant lines.
Main Results:
- The mobile signal is not abscisic acid or the MAX-dependent branching hormone.
- Signal production does not depend on any single carotenoid cleavage dioxygenase.
- Signal production requires beta-carotene synthesis, indicating carotenoids as precursors.
Conclusions:
- Arabidopsis bps1 roots generate a novel, mobile, carotenoid-derived signaling compound.
- This compound plays a significant role in regulating plant development.
- Carotenoids are essential precursors for this newly identified signaling molecule.
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