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Meristem Maintenance in Arabidopsis thaliana
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Physiological Botany.
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The shoot apical meristem (SAM) is the structure that shapes the aerial architecture of the plant, by producing lateral organs throughout development. In the model plant Arabidopsis thaliana, the SAM is always identifiable as a characteristic dome, whether it is found in the centre of a rosette of leaves or at the tip of an inflorescence. When senescence occurs and organogenesis ceases, the now inactive SAM still retains its characteristic appearance and it is never consumed into a terminal structure, such as a flower. Mutant plants that undergo termination represent a valuable tool to understand how the SAM structure and function are maintained during plant life.

The aim of this work was to investigate the dynamics of meristem development through morphological and genetic studies of three Arabidopsis mutants that exhibit distinct modes of SAM termination: distorted architecture 1 (dar1), adenosine kinase 1 (adk1) and terminal flower 2 (tfl2). The dar1 mutation is characterised by a severely distorted cellular architecture within the SAM. We propose that dar1 affects the pattern of cell differentiation and/or cell proliferation within the SAM apical dome, resulting in termination by meristem consumption. Instead, the adk1 mutation affects the organogenic potential of the SAM, without altering its structure. The adk1 mutant has increased levels of cytokinins and, as a consequence of this, cell division is enhanced and cell differentiation is prevented in the apex, causing termination by meristem arrest. Finally, tfl2 is mutated in the conserved chromatin remodelling factor HP1, a transcriptional repressor with multiple roles during plant development. The tfl2 SAM terminates by conversion into a floral structure, due to de-repression of floral identity genes. Interestingly, tfl2 mutants also show an altered response to light, an indication that TFL2 might act as a repressor also in the context of light signalling.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2004. , p. 60
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 993
Keywords [en]
Life sciences and physical sciences, Arabidopsis thaliana, development, shoot apical meristem
Keywords [sv]
NATURVETENSKAP
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-4310ISBN: 91-554-5997-8 (print)OAI: oai:DiVA.org:uu-4310DiVA, id: diva2:164825
Public defence
2004-06-03, MB416, Södertörns Högskola, Alfred Nobel alle', 141 89 Huddinge, 13:00 (English)
Opponent
Supervisors
Available from: 2004-05-13 Created: 2004-05-13 Last updated: 2009-04-02Bibliographically approved
List of papers
1. The pleiotropic mutation dar1 affects plant architecture in Arabidopsis thaliana
Open this publication in new window or tab >>The pleiotropic mutation dar1 affects plant architecture in Arabidopsis thaliana
2003 (English)In: Developmental Biology, ISSN 0012-1606, Vol. 254, no 2, p. 215-25Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91933 (URN)
Available from: 2004-05-13 Created: 2004-05-13 Last updated: 2009-04-02Bibliographically approved
2. Disruption of the ADK1 gene causes meristems distortion and cytokinin syndrome in Arabidopsis thaliana
Open this publication in new window or tab >>Disruption of the ADK1 gene causes meristems distortion and cytokinin syndrome in Arabidopsis thaliana
Show others...
(English)Manuscript (Other (popular science, discussion, etc.))
Identifiers
urn:nbn:se:uu:diva-91934 (URN)
Available from: 2004-05-13 Created: 2004-05-13 Last updated: 2010-01-14Bibliographically approved
3. The TERMINAL FLOWER2 (TFL2) Gene Regulates the Transition to Flowering by Repressing Gene Activity
Open this publication in new window or tab >>The TERMINAL FLOWER2 (TFL2) Gene Regulates the Transition to Flowering by Repressing Gene Activity
(English)Manuscript (Other (popular science, discussion, etc.))
Identifiers
urn:nbn:se:uu:diva-91935 (URN)
Available from: 2004-05-13 Created: 2004-05-13 Last updated: 2010-01-14Bibliographically approved
4. TFL2, the Arabidopsis HP1 protein, is required to modulate light response during plant development
Open this publication in new window or tab >>TFL2, the Arabidopsis HP1 protein, is required to modulate light response during plant development
Show others...
(English)Manuscript (Other (popular science, discussion, etc.))
Identifiers
urn:nbn:se:uu:diva-91936 (URN)
Available from: 2004-05-13 Created: 2004-05-13 Last updated: 2010-01-14Bibliographically approved

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Citation style
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