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Evidence for Resistance‐inducing Compounds in Conidia of Erysiphe graminis f.sp. hordei
Author(s) -
Kristensen H. J.,
SmedegaardPetersen V.
Publication year - 1997
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1997.tb00349.x
Subject(s) - powdery mildew , conidium , germination , biology , inoculation , botany , mildew , horticulture
Preparations of Erysiphe graminis f.sp. hordei conidia were spray‐applied to the first leaf of barley plants which were subsequently challenge inoculated with virulent powdery mildew. The powdery mildew reducing effect of the preparations was assessed by scoring the outcome of the challenge inoculation. Homogenates of ungerminated conidia, germinated conidia, and methanol‐water extracts of germinated conidia reduced the number of powdery mildew colonies. Cell wall fragments from ungerminated conidia, germinated conidia, and conidial germination fluid obtained from conidia germinated in aqueous suspension did not reduce the number of powdery mildew colonies. Microsconical analysis of the infection course following challenge inoculation indicated that the powdery mildew reducing effect is due partly to induced resistance.