| Gravity-regulated formation of the peg in developing cucumber seedlings. | |
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MedLine Citation:
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PMID: 11537999 Owner: NASA Status: MEDLINE |
Abstract/OtherAbstract:
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It has been proposed that peg formation in the vascular transition region (TR zone) between the hypocotyl and the root in Cucurbitaceae seedlings is a gravimorphogenetic phenomenon. Initiation of the peg became visible 36 h after imbibition when cucumber (Cucumis sativus L. cv. Burpee Hybrid II) seeds were germinated in a horizontal position at 24 degrees C in the dark. Simultaneously, sedimented amyloplasts (putative statoliths) were apparent in the sheath cells surrounding the vascular strands, and in the cortical cells immediately adjacent to them, in the TR zone. In contrast, the other cortical cells, some of which were destined to develop into the peg, contained amyloplasts which were not sedimented. These results suggest that the graviperception mechanism for peg formation may be like that of statoliths in shoot gravitropism. By 48 h following imbibition, the cells of the TR zone still had sedimented amyloplasts but had lost their sensitivity to gravity, possibly because of their maturation. |
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Authors:
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H Takahashi; T K Scott |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; 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: Planta Volume: 193 ISSN: 0032-0935 ISO Abbreviation: Planta Publication Date: 1994 |
Date Detail:
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Created Date: 1995-06-13 Completed Date: 1995-06-13 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 1250576 Medline TA: Planta Country: GERMANY |
Other Details:
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Languages: eng Pagination: 580-4 Citation Subset: S |
Affiliation:
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Institute of Genetic Ecology, Tohoku University, Sendai, Japan. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Cucumis sativus
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cytology,
growth & development Gravitropism* Gravity Sensing Hypocotyl / cytology*, growth & development* Plastids / physiology* |
| Investigator | |
Investigator/Affiliation:
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T K Scott / U NC, Chapel Hill |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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