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Germination of Erysiphe gratninis f.sp. hordei conidia on barley leaves
Author(s) -
RUSSELL G. E.,
ANDREWS CHRISTINE R.,
BISHOP C. D.
Publication year - 1975
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1975.tb00532.x
Subject(s) - powdery mildew , biology , conidium , germination , cultivar , spore , blumeria graminis , mildew , inoculation , hordeum vulgare , erysiphe graminis , botany , spore germination , horticulture , poaceae , plant disease resistance , biochemistry , gene
SUMMARY Germination of Erysiphe graminis f.sp. hordei conidia on leaves of several barley cultivars was studied in the laboratory. On both detached leaves and intact plants, within 48 h of inoculation a higher proportion of conidia had germinated on the basal and middle portions of the adaxial leaf surface than on the corresponding portions of the abaxial surface. Such differences between surfaces were not observed near the leaf tip. Similar results were obtained with all the cultivars and growth stages tested, and with five isolates of E. graminis , and are consistent with the observation that there is usually less powdery mildew on the abaxial than the adaxial surface of barley leaves. With most of the barley genotype/mildew isolate combinations tested, within 48 h of inoculation higher proportions of conidia germinated on seedlings and juvenile plants than on older plants. Inherited characteristics which affect spore germination on the leaf surface may be important factors in the development of adult‐plant resistance of barley to powdery mildew, particularly in certain genotypes.