TIME FOR COFFEE controls root meristem size by changes in auxin accumulation in Arabidopsis
| Autor: | Da-Wei Yan, Ying-Tang Lu, Wen-Cheng Liu, Hong-Guo Chen, Li-Wei Hong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Arabidopsis thaliana
Physiology Meristem Arabidopsis Cell Count Plant Science Cyclopentanes Plant Roots chemistry.chemical_compound Auxin Gene Expression Regulation Plant Genes Reporter Circadian Clocks Botany circadian clock heterocyclic compounds Oxylipins Stem Cell Niche Transcription factor Cell Size chemistry.chemical_classification biology Indoleacetic Acids Acropetal auxin transport Arabidopsis Proteins Basic Helix-Loop-Helix Leucine Zipper Transcription Factors Jasmonic acid fungi jasmonic acid food and beverages PIN Nuclear Proteins Biological Transport biology.organism_classification Plants Genetically Modified Hedgehog signaling pathway TIME FOR COFFEE MYC2 chemistry root meristem Mutation Signal transduction auxin Research Paper Signal Transduction Transcription Factors |
| Zdroj: | Journal of Experimental Botany |
| ISSN: | 1460-2431 0022-0957 |
| Popis: | Reduced root meristem length in tic mutant is due to the repressed expression of PIN genes for decreased acropetal auxin transport, leading to low auxin accumulation. MYC2-mediated JA-signaling pathway may not be involved in this process Roots play important roles in plant survival and productivity as they not only anchor the plants in the soil but are also the primary organ for the uptake of nutrients from the outside. The growth and development of roots depend on the specification and maintenance of the root meristem. Here, we report a previously unknown role of TIME FOR COFFEE (TIC) in controlling root meristem size in Arabidopsis. The results showed that loss of function of TIC reduced root meristem length and cell number by decreasing the competence of meristematic cells to divide. This was due to the repressed expression of PIN genes for decreased acropetal auxin transport in tic-2, leading to low auxin accumulation in the roots responsible for reduced root meristem, which was verified by exogenous application of indole-3-acetic acid. Downregulated expression of PLETHORA1 (PLT1) and PLT2, key transcription factors in mediating the patterning of the root stem cell niche, was also assayed in tic-2. Similar results were obtained with tic-2 and wild-type plants at either dawn or dusk. We also suggested that the MYC2-mediated jasmonic acid signalling pathway may not be involved in the regulation of TIC in controlling the root meristem. Taken together, these results suggest that TIC functions in an auxin–PLTs loop for maintenance of post-embryonic root meristem. |
| Databáze: | OpenAIRE |
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