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Counts (gene copy number per g of sample) of total and N2-fixing bacteria in rhizosphere and root endosphere samples of wheat plants by quantitative PCR (qPCR) using specific primer set for 16S rRNA and nifH genes. Samples labeled as F, P, J, and R correspond to Feña, Patras, Joker, and Rocky wheat cultivars, respectively. Error bars represent standard deviation and different lower letters denote statistical difference (P ≤ 0.05, Tukey HSD test) (n = 3).
