Photosynthetic responses of lettuce to downy mildew infection and cytokinin treatment

0349657 - ÚEB 2011 RIV FR eng J - Journal Article
Prokopová, J. - Špundová, M. - Sedlářová, M. - Husičková, A. - Novotný, R. - Doležal, Karel - Nauš, J. - Lebeda, A.
Photosynthetic responses of lettuce to downy mildew infection and cytokinin treatment.
Plant Physiology and Biochemistry. Roč. 48, č. 8 (2010), s. 716-723. ISSN 0981-9428
R&D Projects: GA MŠMT 1M06030; GA ČR(CZ) GP522/02/D011; GA ČR GD522/08/H003
Institutional research plan: CEZ:AV0Z50380511
Keywords : Bremia lactucae * Benzylaminopurine * Chlorophyll fluorescence imaging
Subject RIV: EB - Genetics ; Molecular Biology
Impact factor: 2.402, year: 2010

Changes in primary metabolism of lettuce induced by compatible interaction with biotrophic oomycete pathogen Bremia lactucae under two intensities of illumination in the presence or absence of exogenous cytokinins were studied by chlorophyll fluorescence imaging. Thirteen days post-inoculation leaf discs infected by B. lactucae exhibited impairments of photosynthesis associated with biotrophic infection. Detected changes in photosynthetic parameters correlated with the leaf area colonized by the pathogen´s intercellular hyphae. Application of two cytokinins, previously shown to suppress B. lactucae sporulation if applied 24h prior to inoculation at a concentration of 200 μM, retarded the pathogen´s asexual reproduction with no apparent negative effects on host´s photosynthetic apparatus. However, long-lasting treatment of healthy tissues with this high concentration of exogenous cytokinin led to effects parallel to pathogenesis.
Permanent Link: http://hdl.handle.net/11104/0189836