Extended Data Fig. 9: Relationships between arbuscular mycorrhizal colonization rates and root diameter in woody and non-woody plants.

Analyses were performed using field-measured data (a), as well as data from GRooT and literature (b, c). a, root diameter is positively related with seed mass in temperate non-woody species using the standardized major axis (SMA) regression (non-woody; a, log10(y) = 3.94 log10(x) + 1.01, r = 0.46, P = 2.55 × 10-11, 95% CI = 3.46−4.50, n = 285), but not in temperate woody species (woody, a, r = 0.06, P = 0.32, n = 284). b, Pearson correlation indicates a significantly positive relationship between arbuscular mycorrhizal (AM) colonization and root diameter in both woody and non-woody plants (woody, y = 55.88x + 33.25, r = 0.34, P = 9.66 × 10-7, n = 202; non-woody, y = 57.24x + 1.44, r = 0.53, P = 0.001, n = 32). Shaded areas indicates 95% confidence intervals of the regression lines. Mixed linear model showed no effect of plant growth form (woody versus non-woody) on the linear regression between arbuscular mycorrhizal colonization and root diameter (P = 0.51). c, boxplots of AM colonization rates by plant growth form; the red points represent woody plants, and the blue points represent non-woody plants. Horizontal lines in the middle of the box plots are the median AM colonization rates. There is a difference in AM colonization rate between woody and non-woody plants (n = 234, P = 0.003, F = 50.57****). Each point representing one species. Box plots indicate the median value (solid line), 25th and 75th percentiles (box), and the data range (whiskers).