Organizing Committee


Poster Presentations

Poster Presentations


Effect of silicon amendment on the enhancement of soybean resistance to Phakopsora pachyrhizi

Presenter: G. Arsenault-Labrecque

All authors and affiliations: G. ARSENAULT-LABRECQUE (1), W. Rémus-Borel (1), J. Montpetit (1), R. R. Bélanger (1). (1) Université Laval, Québec, QC, Canada

Silicon (Si), the second most abundant element in the Earth’s crust, is recognized for its beneficial role in plants when absorbed. While it is reported to alleviate abiotic and biotic stresses, such as fungal diseases, little is known about its potential effects on soybean because the plant’s ability to absorb Si is poorly defined. In this project, our objectives were to 1) evaluate and quantify the deposition of Si in leaves of soybean plants (cv. William) fed with various Si concentration, and 2) evaluate whether the subsequent absorption and deposition of Si were able to enhance resistance to soybean rust (Phakopsora pachyrhizi). Hydroponically grown soybean plants were supplied with 0, 0.4, or 1.7 mM and inoculated with spores of P. pachyrhizi. Scanning electron microscopy and X-ray microanalysis mapping were used to determine Si deposition in soybean leaves and rust severity was assessed using the evaluation scale from Bayer CropScience. Based on preliminary results, no significant differences were observed in the plants’ Si content regardless of the Si concentration in the solution. This translated into no effect of the treatment on rust incidence. These results support the concept that a plant’s innate ability to absorb Si will dictate the benefits conferred by Si supply. Assessment of the differential ability of soybean cultivars to absorb Si is currently under investigation.

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