<i>R. irregularis</i> increases nutrient content of plants supplied with water or with nutrient solution.

<p>Nutrient levels in leaves were determined 36 days after inoculation in the plants shown in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0090841#pone-0090841-g003" target="_blank">Figure 3</a>. Values are the mean of three biological replicates. Error bars represent standard deviations. Asterisks indicate significant differences between mycorrhizal roots (black columns) and non-mycorrhizal controls (white columns). (<b>a</b>) Plants were fertilized with basic nutrient solution. Values are expressed relative to the non-mycorrhizal fertilized controls that were set to 100% for each nutrient. (<b>b</b>) As in (a), but without nutrient solution. Values are expressed relative to the non-colonized water-treated controls that were set to 100% for each nutrient.