TAA1-Regulated Local Auxin Biosynthesis in the Root-Apex Transition Zone Mediates the Aluminum-Induced Inhibition of Root Growth in Arabidopsis
| Autor: | Rong Wang, Feng Zhang, Xiaoyu Geng, Zhaojun Ding, Zhong-Bao Yang, Walter J. Horst, Chunmei He |
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| Rok vydání: | 2014 |
| Předmět: |
Mutant
Arabidopsis Amino Acids Cyclic Plant Science Plant Roots Cell wall Plant Growth Regulators Downregulation and upregulation Cell Wall Gene Expression Regulation Plant Genes Reporter Tryptophan Transaminase Auxin Arabidopsis thaliana Research Articles Regulation of gene expression chemistry.chemical_classification Indoleacetic Acids biology Arabidopsis Proteins fungi food and beverages Biological Transport Cell Biology Ethylenes biology.organism_classification Up-Regulation Cell biology Biochemistry chemistry Signal transduction Aluminum Signal Transduction Transcription Factors |
| Zdroj: | The Plant Cell. 26:2889-2904 |
| ISSN: | 1532-298X 1040-4651 |
| DOI: | 10.1105/tpc.114.127993 |
| Popis: | The transition zone (TZ) of the root apex is the perception site of Al toxicity. Here, we show that exposure of Arabidopsis thaliana roots to Al induces a localized enhancement of auxin signaling in the root-apex TZ that is dependent on TAA1, which encodes a Trp aminotransferase and regulates auxin biosynthesis. TAA1 is specifically upregulated in the root-apex TZ in response to Al treatment, thus mediating local auxin biosynthesis and inhibition of root growth. The TAA1-regulated local auxin biosynthesis in the root-apex TZ in response to Al stress is dependent on ethylene, as revealed by manipulating ethylene homeostasis via the precursor of ethylene biosynthesis 1-aminocyclopropane-1-carboxylic acid, the inhibitor of ethylene biosynthesis aminoethoxyvinylglycine, or mutant analysis. In response to Al stress, ethylene signaling locally upregulates TAA1 expression and thus auxin responses in the TZ and results in auxin-regulated root growth inhibition through a number of auxin response factors (ARFs). In particular, ARF10 and ARF16 are important in the regulation of cell wall modification–related genes. Our study suggests a mechanism underlying how environmental cues affect root growth plasticity through influencing local auxin biosynthesis and signaling. |
| Databáze: | OpenAIRE |
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