Open AccessInduced inaccessibility and accessibility in the oat powdery mildew system: insights gained from use of metabolic inhibitors and silicon nutrition
Author(s) -
PRATS ELENA,
CARVER TIMOTHY L. W.,
LYNGKJÆR MICHAEL F.,
ROBERTS PETE C.,
ZEYEN RICHARD J.
Publication year - 2006
Publication title -
molecular plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.945
H-Index - 103
eISSN - 1364-3703
pISSN - 1464-6722
DOI - 10.1111/j.1364-3703.2005.00315.x
Subject(s) - haustorium , powdery mildew , blumeria graminis , phenylpropanoid , biology , microbiology and biotechnology , penetration (warfare) , biochemistry , biosynthesis , biophysics , botany , enzyme , plant disease resistance , host (biology) , genetics , operations research , gene , engineering
SUMMARY Fungal‐induced inaccessibility in oat to Blumeria graminis requires active cell processes. These are reiterative de novo cell processes involved in inherent penetration resistance. Therefore, induced inaccessibility may well involve cellular memory of the initial attack. Phenylpropanoid biosynthesis inhibitors (AOPP and OH‐PAS) and phosphate scavengers (DDG and d ‐mannose) strongly suppressed induced inaccessibility, but silicon nutrition had no effect. Induced accessibility was modulated by the presence of fungal haustoria inside cells. Haustoria actively suppress or reprogram infected plant cells toward a constant state of penetration susceptibility. Neither inhibitor treatments nor silicon nutrition affected fungal‐induced accessibility.