Investigations on the role of cuticular wax in resistance to powdery mildew in grapevine

Investigations on the role of cuticular wax in resistance to powdery mildew in grapevine Cuticular wax on the plant epidermis inhibits or enhances prepenetration events of powdery mildew (Erysiphe necator Schwein). We examined the role of cuticular leaf and berry waxes as a resistance mechanism in four grapevine genotypes (Italia × Mercan-174, Gürcü, Isabella, Özer Karası) resistant to powdery mildew after natural infection and inoculation. To understand cuticular wax properties, we determined the amount of wax and antifungal effects of thin layer chromatography (TLC) fractions from cuticular leaf and berry waxes, then assessed the chemical composition of fractions with different antifungal activities using gas chromatography/mass spectrometry (GC/MS). Susceptible genotypes Cabernet Sauvignon and Italia were used for comparison. Resistant and sensitive genotypes did not differ significantly in the total amount of wax on leaves and berries; however, 27 fatty acids, 26 alkanes, 6 terpenes, 4 indole derivatives and 4 ketones, and 3 amides, 3 phenols and 3 steroids were detected in fractions with high antifungal activity (≥75% inhibition of germination) in leaf and/or berry cuticular waxes of resistant genotypes only. These compounds may be evaluated as markers for powdery mildew resistance during genotype selection in a grapevine breeding program. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of General Plant Pathology Springer Journals

Investigations on the role of cuticular wax in resistance to powdery mildew in grapevine

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Publisher
Springer Journals
Copyright
Copyright © 2017 by The Phytopathological Society of Japan and Springer Japan KK
Subject
Life Sciences; Plant Pathology; Agriculture; Microbiology
ISSN
1345-2630
eISSN
1610-739X
D.O.I.
10.1007/s10327-017-0728-5
Publisher site
See Article on Publisher Site

Abstract

Cuticular wax on the plant epidermis inhibits or enhances prepenetration events of powdery mildew (Erysiphe necator Schwein). We examined the role of cuticular leaf and berry waxes as a resistance mechanism in four grapevine genotypes (Italia × Mercan-174, Gürcü, Isabella, Özer Karası) resistant to powdery mildew after natural infection and inoculation. To understand cuticular wax properties, we determined the amount of wax and antifungal effects of thin layer chromatography (TLC) fractions from cuticular leaf and berry waxes, then assessed the chemical composition of fractions with different antifungal activities using gas chromatography/mass spectrometry (GC/MS). Susceptible genotypes Cabernet Sauvignon and Italia were used for comparison. Resistant and sensitive genotypes did not differ significantly in the total amount of wax on leaves and berries; however, 27 fatty acids, 26 alkanes, 6 terpenes, 4 indole derivatives and 4 ketones, and 3 amides, 3 phenols and 3 steroids were detected in fractions with high antifungal activity (≥75% inhibition of germination) in leaf and/or berry cuticular waxes of resistant genotypes only. These compounds may be evaluated as markers for powdery mildew resistance during genotype selection in a grapevine breeding program.

Journal

Journal of General Plant PathologySpringer Journals

Published: Aug 4, 2017

References

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