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GrainGenes Reference Report: PLA-213-370

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Reference	PLA-213-370
Title	Glucocorticoid-inducible gene expression in rice
Journal	Planta
Year	2001
Volume	213
Pages	370-378
Author	Ouwerkerk PBF Kam RJ Hoge JHC Meijer AH
Abstract	Summary: We have studied the use of a glucocorticoid receptor-based inducible gene expression system in the monocotyledonous model plant rice (Oryza sativa L.). This system, originally developed by T. Aoyama and N.-H. Chua [(1997) Plant J 11: 605-612], is based on the chimaeric transcriptional activator GVG, consisting of the yeast Gal4 DNA-binding domain, the VP16 activation domain and the glucocorticoid receptor domain. For application in rice, we designed an optimized binary vector series (pINDEX) and tested this with the beta-glucuronidase (gusA) reporter gene. GUS expression was tightly controlled and relatively low concentrations (1-10 micromolar) of the glucocorticoid hormone dexamethasone (DEX) were able to induce GUS activities to levels comparable to those conferred by the strong cauliflower mosaic virus (CaMV) 35S promoter. DEX was taken up efficiently by the roots of tissue-cultured plantlets or mature plants in hydroponic culture, and induced GUS activity throughout the whole plant. DEX-induced GUS expression patterns were consistent in all lines and their T1 progeny. The phenotype of tissue-cultured rice plantlets was not affected when inductions with 10-100 micromolar DEX were limited to 1-4 days or when 2-week inductions were performed with 1 micromolar DEX, which was already sufficient to reach near-maximal GUS activity. However, 2-week inductions with 10 micromolar DEX caused growth retardation and developmental defects. As the severity of these effects varied between different lines, we could select lines with a mild phenotype for future use as activator lines in crosses with 'target' plants
Keyword	[ Hide all but 1 of 43 ] 35s promoter activation activation domain activator application beta glucuronidase beta-glucuronidase binary vector cauliflower dna binding dna binding domain dna binding motifs domain expression patterns gene genetic regulation glucocorticoid receptor glucocorticoids growth growth retardation gus gus activity gus expression gusa hormone induction model mosaic-virus nucleotide sequence oryza progeny promoter receptor reporter rice severity target tissue cultures transcription factors transcriptional activator vector virus yeast

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