The objective of this study was to determine the relationship of lignin and etherified ferulic acid (EthFA) concentration of smooth bromegrass clones, divergently selected for lignin or EthFA concentration, with disease resistance to three pathogenic fungi, one biotroph
and two necrotrophs.
Oomycetes, Peronosporaceae) is an obligate biotroph
that infects the leaves, stems, roots, and flowers of numerous cultivated and wild species of Cruciferae (Williams 1985).
However, the phenotypic properties expressed in abiotrophic stages can be factors of selection of zoospores (this is an obligatory biotroph
and the motile phase is also obligatoric for this parasite) or cystospores, but this kind of selection is not necessarily related directly to pathogenicity of P.
Many economically relevant biotrophs
like rusts and powdery mildew fungi are obligate pathogens.
Mycorrhizal fungi and root-knot nematodes share a striking feature, which is their ability to form associations with the roots of the majority of plant species, whereas other biotrophs
generally show a restricted host range (Trudgill and Block, 2001).
Fosetyl aluminium has also been reported for its antifungal activity against various biotrophs
and nectrotrophs (Cohen et al.