Determination of the optimal number of reference genes for normalization by pair-wise variation using geNorm.

<p>All 31 tissue samples set (A), vegetative stage (B), reproductive stage (C), developmental stages (D), viral diseases sample set (E), foliar diseases sample set (F), abiotic stress sample set (G) and different peanut cultivars sample set (H). The pairwise variation (Vn/Vn+1) was analyzed between normalization factors NFn and NFn+1 by geNORM program to determine (V<0.15) the optimal number of reference genes.