Simultaneous activation of SHR and ATHB8 expression defines switch to preprocambial cell state in Arabidopsis leaf development
| Autor: | Tyler J. Donner, Enrico Scarpella, Jason Gardiner |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Transcriptional Activation
Arabidopsis Cell state Models Biological Plant Roots Gene Expression Regulation Plant Xylem Botany Arabidopsis thaliana Leaf development Gene Homeodomain Proteins Regulation of gene expression Cambium biology Arabidopsis Proteins Gene Expression Regulation Developmental Plant physiology Plants Genetically Modified biology.organism_classification Cell biology Plant Leaves Expression (architecture) Seeds Plant Vascular Bundle Biomarkers Transcription Factors Developmental Biology |
| Zdroj: | Developmental Dynamics. 240:261-270 |
| ISSN: | 1058-8388 |
| DOI: | 10.1002/dvdy.22516 |
| Popis: | The processes underlying the formation of leaf vascular networks have long captured the attention of developmental biologists, especially because files of elongated vascular-precursor procambial cells seem to differentiate from apparently equivalent, isodiametric ground cells. In Arabidopsis leaves, ground cells that have been specified to vascular fate engage expression of ARABIDOPSIS THALIANA HOMEOBOX8 (ATHB8). While definition of the transcriptional state of ATHB8-expressing ground cells would be particularly informative, no other genes have been identified whose expression is initiated at this stage. Here we show that expression of SHORT-ROOT (SHR) is activated simultaneously with that of ATHB8 in leaf development. Congruence between SHR and ATHB8 expression domains persists under conditions of manipulated vein patterning, suggesting that inception of expression of SHR and ATHB8 identifies transition to a preprocambial cell state that presages vein formation. Our observations further characterize the molecular identity of cells at anatomically inconspicuous stages of leaf vein development. |
| Databáze: | OpenAIRE |
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