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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1016/j.jplph.2011.03.003
|2 doi
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|a pubmed24n0691.xml
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|a (DE-627)NLM207295476
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|a (NLM)21474200
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|a DE-627
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|e rakwb
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|a eng
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| 100 |
1 |
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|a Holst, Kerstin
|e verfasserin
|4 aut
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|a Enhanced cytokinin degradation in leaf primordia of transgenic Arabidopsis plants reduces leaf size and shoot organ primordia formation
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 07.10.2011
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|a Date Revised 31.03.2022
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2011 Elsevier GmbH. All rights reserved.
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|a The plant hormone cytokinin is a key morphogenic factor controlling cell division and differentiation, and thus the formation and growth rate of organs during a plant's life cycle. In order to explore the relevance of cytokinin during the initial phase of leaf primordia formation and its impact on subsequent leaf development, we increased cytokinin degradation in young shoot organ primordia of Arabidopsis thaliana by expressing a cytokinin oxidase/dehydrogenase (CKX) gene under control of the AINTEGUMENTA (ANT) promoter. The final leaf size in ANT:CKX3 plants was reduced to ∼27% of the wild-type size and the number of epidermal cells was reduced to ∼12% of the wild type. Kinematic analysis revealed that cell proliferation ceased earlier and cell expansion was accelerated in ANT:CKX3 leaves, demonstrating that cytokinin controls the duration of the proliferation phase by delaying the onset of cell differentiation. The reduction of the cell number was partially compensated by an increased cell expansion. Interestingly, ANT:CKX3 leaf cells became about 60% larger than those of 35S:CKX3 leaves, indicating that cytokinin has an important function during cell expansion as well. Furthermore, ANT:CKX3 expression significantly reduced the capacity of both the vegetative as well as the generative shoot apical meristem to initiate the formation of new leaves and flowers, respectively. We therefore hypothesize that the cytokinin content in organ primordia is important for regulating the activity of the shoot meristem in a non-autonomous fashion
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a AINTEGUMENTA protein, Arabidopsis
|2 NLM
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|a Arabidopsis Proteins
|2 NLM
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|a Cytokinins
|2 NLM
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|a Transcription Factors
|2 NLM
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|a Oxidoreductases
|2 NLM
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|a EC 1.-
|2 NLM
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|a cytokinin oxidase
|2 NLM
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|a EC 1.5.99.12
|2 NLM
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| 700 |
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|a Schmülling, Thomas
|e verfasserin
|4 aut
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| 700 |
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|a Werner, Tomáš
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of plant physiology
|d 1979
|g 168(2011), 12 vom: 15. Aug., Seite 1328-34
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|x 1618-1328
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|g volume:168
|g year:2011
|g number:12
|g day:15
|g month:08
|g pages:1328-34
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|u http://dx.doi.org/10.1016/j.jplph.2011.03.003
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