Anna Jo Muhich

CONFLICT OF INTEREST None declared. Supporting Information Filename Description tpj17055-sup-0001-FigureS1.zipZip archive, 2.2 MB Figure S1. The susceptibility of leaf surfaces to B.cinerea vary across the eudicots and the variation is largely explained by the strains' diversity. Figure S2. Leaf thickness and stomata density don't explain the differential in lesion area on the ab/adaxial surfaces across 16 eudicot hosts. Figure S3. Microscopy of B.

Biosynthetic pathways evolve and arise within the context of the genes and compounds previously existing within the organism. Genomic processes such as gene duplication and neofunctionalization can create new biochemical potential which most often alters the chemical output of existing pathways (Weng, 2014). However, completely new pathways are occasionally created in plants.

Abstract Eudicot plant species have bifacial leaves with each surface varying in a diversity of components, resulting in potentially different microhabitats for pathogens. We tested how Botrytis cinerea, a necrotroph fungal pathogen, interacts with the two different leaf surfaces across 16 crop species and 20 Arabidopsis genotypes. This showed that the abaxial surface is generally more susceptible to the pathogen than the adaxial surface.