Effect of nitrogen supply rate on disease resistance in tomato depends on the pathogen |
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Authors: | Hoffland Ellis Jeger Michael J van Beusichem Marinus L |
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Institution: | (1) The Netherlands Sub-department of Soil Science and Plant Nutrition, Wageningen University, P.O. Box 8005, 6700 EC Wageningen, The Netherlands;(2) Present address: Laboratory of Soil Science and Geology, P.O. Box 37, 6700 AA Wageningen, The Netherlands;(3) Laboratory of Phytopathology, P.O. Box 8025, 6700 EE Wageningen, The Netherlands;(4) Present address: Department of Agriculture and Horticulture, Wye College, University of London, Wye, Ashford, Kent, TN25 5AH, United Kingdom |
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Abstract: | The aim of this study was to investigate the effect of tissue nitrogen concentration, as a consequence of nitrogen supply
rate, on the susceptibility of tomato plants to three pathogens. We varied tissue N concentration by supplying N at different
rates by adding nitrate in different, exponentially increasing amounts to the nutrient solution on which the tomato plants
were grown. Separate experiments were carried out to test susceptibility of tomato plants to the bacterial speck-causing Pseudomonas syringae pv tomato, to the wilt agent Fusarium oxysporum f.sp. lycopersici and to tomato powdery mildew caused by Oidium lycopersicum. The effect of tissue N concentration appeared to be highly pathogen-dependent: there was no effect on susceptibility to
F. oxysporum, but susceptibility to P. syringae and O. lycopersicum increased significantly with increasing N concentration. We have previously demonstrated the opposite for susceptibility
to Botrytis cinerea: decreasing susceptibility with increasing N concentration. The apparent contradictory effects are discussed in relation
to the effect of N supply on both the nutritional value of the plant tissue to the pathogen and on the concentration of resistance-related
compounds. We conclude that the effect of changing both characteristics on disease susceptibility is highly pathogen-specific
and is probably dependent on differences in resource requirements of the pathogen or the sensitivity of the pathogen to plant
resistance reactions or on both these factors.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | disease resistance Fusarium oxysporum Lycopersicum esculentum nitrogen supply Oidium lycopersicum Pseudomonas syringae |
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