Effect of Endomycorrhizal Infection on Root System Development in the Apple Rootstock (<i>Malus domestica</i> Borkh.) M26

A mycorrhizal fungus (Glomus intraradices) is able to promote shoot growth of the apple rootstock M26. We have shown that the root system is also modified by the presence of the endophyte. Mycorrhiza formation reduced the shoot to root ratio and increased the specific root length. We show that in apple modifications in root architecture are mainly due to a reduction in the elongation of the different root orders