Nature Communications 6: Article number: 7309 (2015); Published online: 12 June 2015; Updated: 12 August 2015.

In the last paragraph of the Discussion section in this Article, the hybrid Ler & C24 was incorrectly referred to as Ler & Col-0. The following is the correct sentence: ‘The F1 hybrids from two combinations (Col-0 & C24 and Ler & C24), which exhibit heterosis for biomass11,14, show no heterosis for biotrophic bacteria defence in our study (Supplementary Fig. 11)’.