Fig. 1

Global gene expression pattern in wild type petunia and in ram1 mutants. a, b Arbuscular (*) and arbuscule-stunted (arrow) phenotypes of wild type (a) and ram1 mutant (b), respectively. c Comparison of the transcriptional changes in petunia wildtype and ram1 mutants. For both genotypes, gene expression in mycorrhizal roots was compared to non-mycorrhizal control roots. Only genes with a significant change of at least 5-fold induction or repression are shown. d, e Global gene regulation pattern in wild type (d), and ram1 (e). Each point represents a gene and its regulation in mycorrhizal roots versus controls. For AM-specific genes, the control expression was set to 1, therefore, they appear as an increasing straight line of points (number of reads = fold induction)