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Reference gene selection for quantitative reverse transcription-polymerase chain reaction normalization during in
Márcia R de Almeida1, Carolina M Ruedell, Felipe K Ricachenevsky
1Center for Biotechnology, Federal University of Rio Grande do Sul, P,O, Box 15005, 91501-970 Porto Alegre, RS, Brazil.
BMC Molecular Biology
|September 22, 2010
Summary
This study identified the most stable reference genes for accurate gene expression analysis in Eucalyptus globulus during adventitious rooting. Histone H2B (H2B) and Tubulin alpha (TUA) are recommended for normalizing quantitative reverse transcription-polymerase chain reaction (qPCR) in Eucalyptus rooting research.
Area of Science:
- Plant Biotechnology
- Molecular Biology
- Forestry Science
Background:
- Eucalyptus globulus is crucial for the paper industry due to low lignin and frost resistance.
- Adventitious rooting in E. globulus is challenging, often requiring exogenous auxin.
- Accurate gene expression analysis via quantitative reverse transcription-polymerase chain reaction (qPCR) necessitates reliable reference genes for normalization.
Purpose of the Study:
- To identify suitable reference genes for normalizing gene expression during adventitious rooting in E. globulus microcuttings.
- To evaluate the stability of eleven candidate reference genes under varying rooting conditions (with/without auxin) and time points.
Main Methods:
- Expression stability of eleven candidate reference genes (18S, ACT2, EF2, EUC12, H2B, IDH, SAND, TIP41, TUA, UBI, 33380) was assessed using geNorm and NormFinder algorithms.
- Candidate genes were analyzed in E. globulus microcuttings undergoing in vitro rooting, with and without auxin, across six time points.
- The expression of ARGONAUTE1 (AGO1) was analyzed using the most stable candidate genes identified by each algorithm to validate findings.
Main Results:
- Gene expression stability varied significantly among the tested candidate reference genes.
- geNorm identified IDH and SAND as the most stable, while NormFinder indicated H2B and TUA.
- UBI and 18S were consistently identified as the most unstable and thus unsuitable reference genes.
Conclusions:
- Histone H2B (H2B) and Tubulin alpha (TUA) are the most suitable reference genes for normalizing qPCR data in E. globulus adventitious rooting studies.
- UBI and 18S are inappropriate for use as reference genes in this specific experimental context.
- The selection of H2B and TUA will enhance the accuracy and reliability of gene expression studies in E. globulus, particularly for rooting and propagation research.
