The Effect of Water Stress and Fusarium Oxysporum F. Sp. Lycoperseci on Leaf Water Potential and Soil Matric Potential in Tomato Under Different Levels Of Water Stress on Greenhouse Condition

摘要

The effect of water stress and Fusarium oxysporum f. sp. lycoperseci (Fol) on growth of tomato was studied in a greenhouse experiment. Treatments consisted of five levels of water stress (1, 3, 5, 7 and 9 days irrigation intervals). Infested soil consisting of 400 chlamydospores g-1 of Fol and non- infested soil were used. The experiment was arranged in a randomized completely design with 8 replications (4 infested and 4 noninfested soil) under greenhouse condition (18- 35 0C). Six-week-old tomato seedlings cultivar Porimo after transferring to infest and non-infested soil were exposed to water stress. During the experiment leaf water potential and soil matric potential were measured. Disease symptoms appeared earlier in treatments with high water stress than the other treatments. Results showed that leaf water potential was reduced with increasing irrigation interval and also in infested soil. The values of soil matric potential in infected plants were higher than that in non-infected plants. Root colonization by Fol increased with increasing irrigation intervals, but differences were not significant.