{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T01:08:08Z","timestamp":1791508088272,"version":"4.3.4"},"reference-count":81,"publisher":"Oxford University Press (OUP)","issue":"2","license":[{"start":{"date-parts":[[2021,1,25]],"date-time":"2021-01-25T00:00:00Z","timestamp":1611532800000},"content-version":"vor","delay-in-days":3463,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2011,10,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Cytokinins are phytohormones that are involved in various regulatory processes throughout plant development, but they are also produced by pathogens and known to modulate plant immunity. A novel transgenic approach enabling autoregulated cytokinin synthesis in response to pathogen infection showed that cytokinins mediate enhanced resistance against the virulent hemibiotrophic pathogen Pseudomonas syringae pv tabaci. This was confirmed by two additional independent transgenic approaches to increase endogenous cytokinin production and by exogenous supply of adenine- and phenylurea-derived cytokinins. The cytokinin-mediated resistance strongly correlated with an increased level of bactericidal activities and up-regulated synthesis of the two major antimicrobial phytoalexins in tobacco (Nicotiana tabacum), scopoletin and capsidiol. The key role of these phytoalexins in the underlying mechanism was functionally proven by the finding that scopoletin and capsidiol substitute in planta for the cytokinin signal: phytoalexin pretreatment increased resistance against P. syringae. In contrast to a cytokinin defense mechanism in Arabidopsis (Arabidopsis thaliana) based on salicylic acid-dependent transcriptional control, the cytokinin-mediated resistance in tobacco is essentially independent from salicylic acid and differs in pathogen specificity. It is also independent of jasmonate levels, reactive oxygen species, and high sugar resistance. The novel function of cytokinins in the primary defense response of solanaceous plant species is rather mediated through a high phytoalexin-pathogen ratio in the early phase of infection, which efficiently restricts pathogen growth. The implications of this mechanism for the coevolution of host plants and cytokinin-producing pathogens and the practical application in agriculture are discussed.<\/jats:p>","DOI":"10.1104\/pp.111.182931","type":"journal-article","created":{"date-parts":[[2011,8,4]],"date-time":"2011-08-04T05:32:04Z","timestamp":1312435924000},"page":"815-830","source":"Crossref","is-referenced-by-count":190,"title":["Cytokinins Mediate Resistance against<i>Pseudomonas syringae<\/i>in Tobacco through Increased Antimicrobial Phytoalexin Synthesis Independent of Salicylic Acid Signaling \u00a0 \u00a0"],"prefix":"10.1093","volume":"157","author":[{"given":"Dominik K.","family":"Gro\u00dfkinsky","sequence":"first","affiliation":[{"name":"Institute for Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria (D.K.G., H.P., E.v.d.G., U.S., T.R.); Department of Pharmaceutical Biology, University of W\u00fcrzburg, 97082 Wuerzburg, Germany (M.N., U.R.A., N.P., T.E.); Department of Biology, University of D\u00fcsseldorf, 40225 Duesseldorf, Germany (T.G., J.Z.); Laboratory of Growth Regulators, Faculty of Science, Pa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Muhammad","family":"Naseem","sequence":"additional","affiliation":[{"name":"Institute for Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria (D.K.G., H.P., E.v.d.G., U.S., T.R.); Department of Pharmaceutical Biology, University of W\u00fcrzburg, 97082 Wuerzburg, Germany (M.N., U.R.A., N.P., T.E.); Department of Biology, University of D\u00fcsseldorf, 40225 Duesseldorf, Germany (T.G., J.Z.); Laboratory of Growth Regulators, Faculty of Science, Pa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Usama Ramadan","family":"Abdelmohsen","sequence":"additional","affiliation":[{"name":"Institute for Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria (D.K.G., H.P., E.v.d.G., U.S., T.R.); Department of 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Physiology, University of Graz, 8010 Graz, Austria (D.K.G., H.P., E.v.d.G., U.S., T.R.); Department of Pharmaceutical Biology, University of W\u00fcrzburg, 97082 Wuerzburg, Germany (M.N., U.R.A., N.P., T.E.); Department of Biology, University of D\u00fcsseldorf, 40225 Duesseldorf, Germany (T.G., J.Z.); Laboratory of Growth Regulators, Faculty of Science, Pa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Griebel","sequence":"additional","affiliation":[{"name":"Institute for Plant Sciences, Department of Plant Physiology, University of Graz, 8010 Graz, Austria (D.K.G., H.P., E.v.d.G., U.S., T.R.); Department of Pharmaceutical Biology, University of W\u00fcrzburg, 97082 Wuerzburg, Germany (M.N., U.R.A., N.P., T.E.); Department of Biology, University of D\u00fcsseldorf, 40225 Duesseldorf, Germany (T.G., J.Z.); Laboratory of Growth Regulators, Faculty of Science, 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