[The effect of root zone temperature and light radiation intensity on tomato infection by Pythium aphanidermatum]
2007
Panova, G.G. | Grote, D. | Kvering, Kh.-P., Research and Development Inst. of Agrophysics, Saint-Petersburg (Russian Federation)
Development of the pathogenic fungus Pythium aphanidermatum was under study at controlled conditions of the climatic chamber. The regularities were learnt at the system of nutrient solution and tomato roots after their inoculation by the pathogen. Plant response to the infection was researched at different temperatures of the root-inhabited medium and at different ranges of photosynthetic active radiation. It was experimentally showed that the temperature had a great influence on infection development and the final effect of the plant and pathogen interaction. The temperature of the nutrient solution at level 20 deg C was favorable for tomato root growth and development. The plants were tolerant to the pathogen at these conditions and a number of the pathogen remained practically constant during the experiment. Intensive P. aphanidermatum formation and plant pathogenesis occurred within the system at 25 deg C temperature. No reliable differences were found with respect to the pathogen and tomato interactions at the range of photosynthetic active radiation of 30 and 60 Watt per square meter.
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