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Our previous studies with <jats:styled-content style=\"fixed-case\"><jats:italic>Arabidopsis thaliana<\/jats:italic><\/jats:styled-content> demonstrated that potassium (K) deprivation induced the biosynthesis of jasmonic acid (JA) and increased the plant's resistance to herbivorous insects. Here, we addressed the question of how tissue K affects the development of fungal pathogens and whether sensitivity of the pathogens to JA could play a role for the K\u2013disease relationship in barley (<jats:styled-content style=\"fixed-case\"><jats:italic>Hordeum vulgare<\/jats:italic><\/jats:styled-content> cv. Optic). We report that K\u2010deprived barley plants showed increased leaf concentrations of JA and other oxylipins. Furthermore, a natural tip\u2010to\u2010base K\u2010concentration gradient within leaves of K\u2010sufficient plants was quantitatively mirrored by the transcript levels of JA\u2010responsive genes. The local leaf tissue K concentrations affected the development of two economically important fungi in opposite ways, showing a positive correlation with powdery mildew (<jats:italic>Blumeria graminis<\/jats:italic>) and a negative correlation with leaf scald (<jats:italic>Rhynchosporium commune<\/jats:italic>) disease symptoms. <jats:italic>B.\u00a0graminis<\/jats:italic> induced a JA response in the plant and was sensitive to methyl\u2010JA treatment whereas <jats:italic>R.\u00a0commune<\/jats:italic> initiated no JA response and was JA insensitive. Our study challenges the view that high K generally improves plant health and suggests that JA sensitivity of pathogens could be an important factor in determining the exact K\u2013disease relationship.<\/jats:p>","DOI":"10.1111\/pce.13350","type":"journal-article","created":{"date-parts":[[2018,5,31]],"date-time":"2018-05-31T10:36:04Z","timestamp":1527762964000},"page":"2357-2372","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Contrasting nutrient\u2013disease relationships: Potassium gradients in barley leaves have opposite effects on two fungal pathogens with different sensitivities to jasmonic acid"],"prefix":"10.1111","volume":"41","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5820-328X","authenticated-orcid":false,"given":"Jayne L.","family":"Davis","sequence":"first","affiliation":[{"name":"Plant Science Group, Institute for Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life 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