Source:http://linkedlifedata.com/resource/pubmed/id/12447533
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| Predicate | Object |
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| rdf:type | |
| lifeskim:mentions | |
| pubmed:dateCreated |
2002-11-26
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| pubmed:abstractText |
We have developed experimental systems to study hydrotropism in seedling roots of Arabidopsis thaliana (L.) Heynh. Arabidopsis roots showed a strong curvature in response to a moisture gradient, established by applying 1% agar and a saturated solution of KCl or K(2)CO(3) in a closed chamber. In this system, the hydrotropic response overcame the gravitropic response. Hydrotropic curvature commenced within 30 min and reached 80-100 degrees within 24 h of hydrostimulation. When 1% agar and agar containing 1 MPa sorbitol were placed side-by-side in humid air, a water potential gradient formed at the border between the two media. Although the gradient changed with time, it still elicited a hydrotropic response in Arabidopsis roots. The roots curved away from 0.5-1.5 MPa of sorbitol agar. Various Arabidopsis mutants were tested for their hydrotropic response. Roots of aba1-1 and abi2-1 mutants were less sensitive to hydrotropic stimulation. Addition of abscisic acid restored the normal hydrotropic response in aba1-1 roots. In comparison, mutants that exhibit a reduced response to gravity and auxin, axr1-3 and axr2-1, showed a hydrotropic response greater than that of the wild type. Wavy mutants, wav2-1 and wav3-1, showed increased sensitivity to the induction of hydrotropism by the moisture gradient. These results suggest that auxin plays divergent roles in hydrotropism and gravitropism, and that abscisic acid plays a positive role in hydrotropism. Furthermore, hydrotropism and the wavy response may share part of a common molecular pathway controlling the directional growth of roots.
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| pubmed:language |
eng
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| pubmed:citationSubset |
IM
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| pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/ABI2 protein, Arabidopsis,
http://linkedlifedata.com/resource/pubmed/chemical/AXR1 protein, Arabidopsis,
http://linkedlifedata.com/resource/pubmed/chemical/AXR3 protein, Arabidopsis,
http://linkedlifedata.com/resource/pubmed/chemical/Abscisic Acid,
http://linkedlifedata.com/resource/pubmed/chemical/Arabidopsis Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/Carbonates,
http://linkedlifedata.com/resource/pubmed/chemical/Growth Substances,
http://linkedlifedata.com/resource/pubmed/chemical/Indoleacetic Acids,
http://linkedlifedata.com/resource/pubmed/chemical/Nuclear Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/Phosphoprotein Phosphatases,
http://linkedlifedata.com/resource/pubmed/chemical/Plant Growth Regulators,
http://linkedlifedata.com/resource/pubmed/chemical/Potassium,
http://linkedlifedata.com/resource/pubmed/chemical/Potassium Chloride,
http://linkedlifedata.com/resource/pubmed/chemical/Sorbitol,
http://linkedlifedata.com/resource/pubmed/chemical/Water,
http://linkedlifedata.com/resource/pubmed/chemical/potassium carbonate
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| pubmed:status |
MEDLINE
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| pubmed:author | |
| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
203-11
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| pubmed:dateRevised |
2007-11-15
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| pubmed:articleTitle |
Hydrotropism in abscisic acid, wavy, and gravitropic mutants of Arabidopsis thaliana.
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| pubmed:affiliation |
Graduate School of Life Sciences, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan.
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