Age-related resistance to Pseudomonas syringae pv. tomato is associated with the transition to flowering in Arabidopsis and is effective against Peronospora parasitica |
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| Authors: | C Rusterucci Z Zhao K Haines D Mellersh M Neumann RK Cameron |
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| Institution: | aLaboratoire de Génomique Fonctionelle des Plantes, 33 rue St Leu, F-80039 Amiens, Cedex, France;bPlant Biotechnology Institute, National Research Council, Saskatoon, Sask., Canada S7N 0W9;cDepartment of Botany, University of Toronto, Toronto, Ont., Canada M5S 3B2;dCentre for Plant Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK;eDepartment of Biology, McMaster University, 1280 Main St West, Hamilton, Ont., Canada L8S 4K1 |
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| Abstract: | As plants mature it has been observed that some become more resistant to normally virulent pathogens. The ability to manifest the Age-Related Resistance (ARR) response in Arabidopsis to Pseudomonas syringae pathovars tomato (Pst) coincided with the transition to flowering in plants both delayed and accelerated in the transition to flowering. ARR was also associated with a change in PR-1 gene expression, such that young plants expressed PR-1 abundantly at 3 days post inoculation (dpi) while mature plants expressed much less. The Arabidopsis ARR response requires SA accumulation via isochorismate synthase (ICS1) 24]. ICS1 was expressed one dpi with virulent and avirulent Pst in both young and mature plants. The ARR response was also effective versus avirulent Pst providing an additional 4-fold limitation in bacterial growth. Arabidopsis ARR was found to be ineffective against two necrotrophs, Erwinia carotovora subspecies carotovora (bacterium) and Botrytis cinerea (fungus) and one obligate biotroph, Erysiphe cichoracearum (fungus). However, mature wild type, SA-deficient sid2 and NahG plants supported little growth of the obligate biotrophic oomycete, Peronospora parasitica. Therefore ARR to P. parasitica appears to be SA-independent, however the level of ARR resistance was somewhat reduced in these mutants in some experiments. Thus, there may be numerous defence pathways that contribute to adult plant resistance in Arabidopsis. |
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| Keywords: | Arabidopsis thaliana Pseudomonas syringae pv tomato Botrytis cinerea Erysiphe cichoracearum Erwinia carotovora subspecies carotovora Peronospora parasitica Age-related resistance PR-1 |
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