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Dr. Francois Belzile “Silicon Transporters and the Benefits of Silicon in Plants” скачать в хорошем качестве

Dr. Francois Belzile “Silicon Transporters and the Benefits of Silicon in Plants” 3 года назад

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Dr. Francois Belzile “Silicon Transporters and the Benefits of Silicon in Plants”
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Dr. Francois Belzile “Silicon Transporters and the Benefits of Silicon in Plants”

“Silicon Transporters and the Benefits of Silicon in Plants” Dr. Francois Belzile University Laval Presenting on behalf of Dr. Richard Belanger Although silicon (Si) is not considered as an essential element for plant growth, its uptake is beneficial in alleviating abiotic and biotic stresses. These positive effects are not always manifest since accumulation differs among plant species. This differential accumulation was poorly understood or explained until the discovery of specific genes involved in Si uptake. These genes were first described in rice with homologs reported in maize and barley. With the advent of high throughput sequencing and easier access to genomic data, it is now possible to determine with precision the potential of a plant to accumulate Si, and therefore benefit from its absorption, on the basis of its genetic predisposition. For example, wheat is another plant species known to accumulate fairly large concentrations of Si and to respond well to Si treatment. From this premise, we sought to identify and characterize the presence of Si-transport genes in wheat, and to determine their functionality and localization. Our results have allowed the identification and the cloning of a putative Si-transport gene presenting high homology (greater than 80 %) with the Si-influx protein in rice known as Lsi1. Horsetail is another plant species possibly known as the greatest absorber of Si that offers great potential to unveil Si transporters. Through the sequencing of the horsetail root transcriptome, we have found a new family of Si transporters with unique properties. The discovery of these transporters provides a unique opportunity to understand the uptake of Si and possibly devise new strategies to control plant diseases. Silicon has not been given the same level of attention as a limiting factor in soil fertility and crop production as other nutrients. This view is changing as agronomists become more aware of the valuable function of silicon nutrition in crops and soils and even animal life. Research conducted on many soils worldwide has shown that supplying crops with plant available silicon can suppress disease, reduce insect attack, improve environmental stress tolerance and increase crop productivity. Silicon is now officially designated as a plant beneficial substance by the Association of American Plant Food Control Officials (AAPFCO). Plant available silicon may now be listed on fertilizer labels. Soil scientists and agronomists from the United States, Canada, China and Brazil took part in the symposium formally called Silicon Soil Fertility and Nutrient Management. It was held in October, 2012 in Cincinnati, Ohio at the Tri-Societies Conference conducted by the American Society of Agronomy (ASA), the Crop Science Society of America (CSSA) and the Soil Science Society of America (SSSA).

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