Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 5/12/2014
Publication Date: 11/11/2014
Citation: Wallis, C.M., Centofanti, T., Banuelos, G.S. 2014. Effects of a selenium-laden soil amendment on grapevine metabolism and progression of Pierce’s disease. American Phytopathological Society Abstracts. 104:S3.124.
Technical Abstract: Selenium containing soil amendments might be beneficial to growers as selenium may increase resistance to certain plant pathogens and pests. Therefore, grapevines growing in soil with different amounts of selenium-laden amendment were evaluated for metabolism and susceptibility to Pierce’s disease (caused by the bacterium Xylella fastidiosa). The selenium amendments had few effects on grapevine amino acid and sugar levels. Levels of the phenolic compounds caftaric acid, procyanidin B2, epicatechin gallate, and catechin gallate were significantly greater in plants grown in soil with greatest selenium levels than those with less. However, phenolic levels were similar between grapevines grown with the most selenium and those grown with no added selenium. Grapevines with low and moderate levels of added selenium had greater amounts of the terpenoids camphene and linalool than grapevines grown with no added selenium. PD symptom severity was not significantly different among grapevines grown in soils with different levels of selenium. These results exhibit the ability of selenium soil amendments to change grapevine host metabolite levels. However, selenium soil amendment does not appear to be a suitable treatment to limit PD symptom progression.