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. 2018 Apr 1;19(4):1049. doi: 10.3390/ijms19041049

Figure 4.

Figure 4

Comparison of the symbiotic properties of P. vulgaris plants inoculated with a ntrB deletion mutant (ΔntrB) with those of the P. phymatum nalidixic acid-resistant wild-type (wt nalR) strain. Number of nodules per plant (A), dry weight per nodule (B), and relative nitrogenase activity (C) were determined at 21 days post-infection (dpi). Here, the combined results of two independent experiments are shown. Error bars indicate the standard error of the mean (SEM). The two columns were analyzed by an unpaired student t-test (p-values are indicated above the SEM, * indicates p-value < 0.05).