Sweet potato NAC transcription factor, IbNAC1, upregulates sporamin gene expression by binding the SWRE motif against mechanical wounding and herbivore attack
| Autor: | I Winnie Lin, Shiao-Chi Chang, Hui-Shan Lo, Xuanyang Chen, Kai-Wun Yeh, Shi-Peng Chen, Hseuh-Han Lu, Yin-Hao Huang |
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| Rok vydání: | 2015 |
| Předmět: |
0106 biological sciences
0301 basic medicine Transgene Amino Acid Motifs Plant Science Cyclopentanes Ipomoea 01 natural sciences 03 medical and health sciences chemistry.chemical_compound Gene Expression Regulation Plant Stress Physiological Two-Hybrid System Techniques Gene expression Genetics Storage protein Herbivory Oxylipins Ipomoea batatas Transcription factor Plant Proteins chemistry.chemical_classification biology cDNA library Jasmonic acid fungi food and beverages Cell Biology biology.organism_classification Plants Genetically Modified Up-Regulation 030104 developmental biology chemistry Biochemistry Signal transduction 010606 plant biology & botany Signal Transduction Transcription Factors |
| Zdroj: | The Plant journal : for cell and molecular biology. 86(3) |
| ISSN: | 1365-313X |
| Popis: | Sporamin is a tuberous storage protein with trypsin inhibitory activity in sweet potato (Ipomoea batatas Lam.), which accounts for 85% of the soluble protein in tubers. It is constitutively expressed in tuberous roots but is expressed in leaves only after wounding. Thus far, its wound-inducible signal transduction mechanisms remain unclear. In the present work, a 53-bp DNA region, sporamin wound-response cis-element (SWRE), was identified in the sporamin promoter and was determined to be responsible for the wounding response. Using yeast one-hybrid screening, a NAC domain protein, IbNAC1, that specifically bound to the 5'-TACAATATC-3' sequence in SWRE was isolated from a cDNA library from wounded leaves. IbNAC1 was constitutively expressed in root tissues and was induced earlier than sporamin following the wounding of leaves. Transgenic sweet potato plants overexpressing IbNAC1 had greatly increased sporamin expression, increased trypsin inhibitory activity, and elevated resistance against Spodoptera litura. We further demonstrated that IbNAC1 has multiple biological functions in the jasmonic acid (JA) response, including the inhibition of root formation, accumulation of anthocyanin, regulation of aging processes, reduction of abiotic tolerance, and overproduction of reactive oxygen species (ROS). Thus, IbNAC1 is a core transcription factor that reprograms the transcriptional response to wounding via the JA-mediated pathway in sweet potato. |
| Databáze: | OpenAIRE |
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