Percentage of strains, for each of the six clusters of recorded plant root response types, that display the tested PGP traits.

<p>Percentage of strains, for each of the six clusters of recorded plant root response types, that display the tested PGP traits.</p

Representative <i>Arabidopsis</i> root hairs distribution.

<p>The morphology on maturation zone is compared among the six clusters to a) non-inoculated roots and e) 50 nM IAA-treated seedlings. b) seedling roots grouped in cluster 1 and 2, c) seedling roots grouped in cluster 3–4; d) seedling roots grouped in clusters 5 and 6. Scale bars: 500 μm.</p

Effects of bacterial strains on <i>Arabidopsis</i> root architecture.

<p>a-c) supervised model based clustering performed on the variables a) length b) diameter and c) area of the roots. d) <i>Arabidopsis</i> plantlet phenotypes (after two weeks of growing) grouped in different clusters obtained from “model based cluster” analysis in comparison with non-inoculated (control) and 50nM IAA-treated seedlings. Scale bars: 1 cm.</p

PGP traits of isolated bacteria across different Classes.

<p>IAA, indole acetic acid; CMC, carboxy-methyl cellulose.</p><p>PGP traits of isolated bacteria across different Classes.</p

Assayed PGP traits of selected strain, their cluster attribution and their taxonomical identification.

<p>Assayed PGP traits of selected strain, their cluster attribution and their taxonomical identification.</p