Fig. 2. Conservation of bacterial orders of the root and phycosphere microbiota across photosynthetic organisms.

Phylogeny was inferred from a multiple sequence alignment of the ribulose-bisphosphate carboxylase gene (rbcL) of 35 plant species and Chlamydomonas reinhardtii. The bar plots represent the average aggregated relative abundance of the six bacterial orders found to be present in the root microbiota of each plant species (80% occupancy and ≥0.1% average relative abundance). Leaf nodes depicted with a star symbol denote community profiles of plants grown in CAS soil in the greenhouse^7,43, whereas those marked with a circle were obtained from plants sampled at the Cooloola natural site chronosequence¹¹. Includes data for At and Cr from experiment A (Supplementary Fig. 1a and Supplementary Table 1).