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

Abstract

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
 stress than the other treatments. Results showed that leaf water potential was reduced with increasing irrigation  with high water 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.