| Root graviresponsiveness and cellular differentiation in wild-type and a starchless mutant of Arabidopsis thaliana. | |
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MedLine Citation:
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PMID: 11537658 Owner: NASA Status: MEDLINE |
Abstract/OtherAbstract:
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Primary roots of a starchless mutant of Arabidopsis thaliana L. are strongly graviresponsive despite lacking amyloplasts in their columella cells. The ultrastructures of calyptrogen and peripheral cells in wild-type as compared to mutant seedlings are not significantly different. The largest difference in cellular differentiation in caps of mutant and wild-type roots is the relative volume of plastids in columella cells. Plastids occupy 12.3% of the volume of columella cells in wild-type seedlings, but only 3.69% of columella cells in mutant seedlings. These results indicate that: (1) amyloplasts and starch are not necessary for root graviresponsiveness; (2) the increase in relative volume of plastids that usually accompanies differentiation of columella cells is not necessary for root graviresponsiveness; and (3) the absence of starch and amyloplasts does not affect the structure of calyptrogen (i.e. meristematic) and secretory (i.e. peripheral) cells in root caps. These results are discussed relative to proposed models for root gravitropism. |
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Authors:
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R Moore |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Annals of botany Volume: 64 ISSN: 0305-7364 ISO Abbreviation: Ann. Bot. Publication Date: 1989 |
Date Detail:
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Created Date: 1995-03-30 Completed Date: 1995-03-30 Revised Date: 2009-10-19 |
Medline Journal Info:
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Nlm Unique ID: 0372347 Medline TA: Ann Bot Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 271-7 Citation Subset: S |
Affiliation:
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Department of Biological Sciences, Wright State University, Dayton, Ohio 45435. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Arabidopsis
/
cytology,
genetics,
growth & development*,
ultrastructure* Cell Differentiation Gravitropism* Microscopy, Electron Phosphoglucomutase / deficiency Plant Root Cap / ultrastructure Plant Roots / cytology, growth & development, ultrastructure Plastids / physiology*, ultrastructure* Starch* Time Factors |
| Chemical | |
Reg. No./Substance:
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9005-25-8/Starch; EC 5.4.2.2/Phosphoglucomutase |
| Investigator | |
Investigator/Affiliation:
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R Moore / Wright St U, Dayton, OH, Dept Biological Sciences |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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