NDLI: Suppression of conidial germination and appressorial formation by silicate treatment in powdery mildew of strawberry

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Journal of General Plant Pathology : Volume 72

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Suppression of conidial germination and appressorial formation by silicate treatment in powdery mildew of strawberry

Content Provider	Springer Nature Link
Author	Kanto, Takeshi Maekawa, Kazumasa Ai, Masataka
Copyright Year	2007
Abstract	The mode of action of soluble silicon against strawberry powdery mildew (Sphaerotheca aphanis var. aphanis) was investigated in four experiments. First, silicon-treated leaves from plants grown with silicate (Si+) and control leaves were excised, inoculated with conidia, and subsequent germination and formation of appressoria in a petri dish was assessed after 24 h. The germination rate was 49.7% on Si+ leaves, and was 67.2% on control leaves (t-test, P < 0.01). Second, we soaked cellulose membranes in various solvents and then placed the membranes on 4% water agar, dusted the membranes with conidia, and examined after 12 h. No difference was apparent between any treatment and the control (distilled water). Third, strawberries growing hydroponically with additional silicon in the medium were inoculated with conidia, and leaves were observed with a scanning electron microscope 1–2 days after inoculation. Germ tubes and secondary hyphae were shorter and had fewer branches on Si+ leaves than on the control. Moreover, penetration appeared to be inhibited. Fourth, the cuticle was separated from leaves from plants grown as in the third experiment, placed on water agar, and dusted with conidia. Germination of conidia, observed with a light microscope, on Si+ leaves was suppressed markedly to 40%–60% of that of the control. These results suggested that soluble silicon induced physiological changes in the cuticle layer after absorption by the plant. In addition, soluble silicate reduced germination of conidia, formation of appressoria, and possibly the penetration of powdery mildew.
Starting Page	1
Ending Page	7
Page Count	7
File Format	PDF
ISSN	13452630
Journal	Journal of General Plant Pathology
Volume Number	73
Issue Number	1
e-ISSN	1610739X
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-02-16
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Strawberry powdery mildew Liquid potassium silicate Conidial germination Cuticle Plant Pathology Agriculture Microbiology
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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