marginally significantp < 0.07
ATX-A content was significantly (F-test; R 2 = −0.43, p < 0.01; Figure 4B ) negatively correlated with growth rate, while ATX-A content exhibited a positive, marginally significant (F-test; R 2 = 0.26, p < 0.07; Figure 4C ) correlation with N 2 fixation rate.