Overexpression of Arabidopsis Wali7 Domain-Containing Protein ASR Produces Auxin-Mediated Short-Root Phenotype

Autor: Changtian Chen, Jinguang Huang, Ya-Ru Fu, Changai Wu, Yunxue Lei
Rok vydání: 2013
Předmět:
Zdroj: Journal of Plant Growth Regulation. 33:355-363
ISSN: 1435-8107
0721-7595
DOI: 10.1007/s00344-013-9386-9
Popis: Wali7 domain-containing protein has been isolated from roots and root hairs. However, the function of this protein has not been reported yet. This study demonstrated that overexpression of a gene encoding Arabidopsis Wali7 domain-containing protein, called auxin-mediated short root (ASR), produced a short-root phenotype. Expression analysis indicated that ASR was induced by auxin. ASR overexpression resulted in a lower level of auxin in transgenic plant roots as indicated by lower DR5::β-glucuronidase (GUS) activity and lower expressions of genes encoding the rate-limited enzymes of auxin synthesis. Our results also suggested that ASR overexpression caused decreased meristematic activity and impaired stem cell division as indicated by CycB1:1::GUS activity and lower expression of a plethora of stem cell transcription factors, respectively. In addition, exogenous application of auxin (NAA and indole-3-acetic acid) could repair root development defects. ASR overexpression decreased auxin levels in transgenic Arabidopsis roots, caused decreased meristematic activity and impaired stem cell division, and resulted in a short-root phenotype.
Databáze: OpenAIRE
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