Recommended comprehensive ranking.

<p>Recommended comprehensive ranking.</p

Genome and amplification information on the candidate reference genes 1–10^**.

<p>Genome and amplification information on the candidate reference genes 1–10^{<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0193418#t001fn002" target="_blank">**</a>}.</p

Efficiency of primer pairs used for RT-qPCR amplification in each experiment.

<p>Efficiency of primer pairs used for RT-qPCR amplification in each experiment.</p

Ranking of the 12 candidate reference genes according to their transcription stability.

<p>Ranking of the 12 candidate reference genes according to their transcription stability.</p

Transcriptional stability of the candidate reference genes investigated by geNorm.

<p>The candidate reference genes, <i>OsEF-1a</i> (Os03t0177500-01), <i>P1</i> (Os01t0220700-00), <i>P2</i> (Os01t0252200-01), <i>P3</i> (Os01t0654300-01), <i>P4</i> (Os01t0759500-01), <i>P5</i> (Os05t0352700-00), <i>P6</i> (Os07t0644200-01), <i>P8</i> (Os09t0560400-01), <i>P9</i> (Os10t0378400-01), <i>P10</i> (Os12t01119600-00), <i>GAPDH</i> (Os04t0606400-02), and <i>OsNABP</i> (Os06g0215200) were evaluated in shoots and roots of one japonica (Nipponbare) and two contrasting indica (Epagri 108 and IRGA 409) cultivars subjected to iron treatment (500 mg L^-1 FeSO₄.7H₂O at pH 4.0 ± 0.1), for 0, 12, 24 and 36 hours.</p