Figure 5.

Plant Biosynthesis and Secretion of Fraxetin Is Necessary for Microbiota-Mediated Growth Rescue

(A and B) (A) SFW and (B) leaf chlorophyll content of indicated coumarin biosynthesis and export mutants grown on unavFe media inoculated with heat-killed or live bacterial SynCom. SFW data are from two experiments (n = 36 plants). Chlorophyll content is from one experiment (n = 3 pooled leaf samples). Asterisks indicate significance between heat-killed- and live SynCom-inoculated groups by Wilcoxon ranked sum test for SFW and Student’s t test for chlorophyll content (^∗, ^∗∗, and ^∗∗∗ indicate p ≤ 0.05, 0.01, and 0.001, respectively). See also Figure S5.