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Öğe Increasing Drought Tolerance of Tomato Plants by Grafting(Int Soc Horticultural Science, 2012) Altunlu, H.; Gul, A.; Balliu, A; Gruda, NThe experiment was conducted in 3 steps in a growth chamber by aerated nutrient solution culture. Drought stress was fixed as Psi s=-1.0 MPa; and reached gradually with PEG addition. In the first step 10 commercially available rootstock genotypes ('Beaufort', 'Maxifort', 'Unifort', 'Yedi', 'Kemerit', 'King Kong', 'Spirit', 'Resistar', '500292' and 'Toro') and in the second step 12 indeterminate tomato cultivars from different types in respect to their fruit weights (Cherry (10-25 g): 'Sweet 100', 'AG1015', and 'M25'; Cocktail (25-65 g): 'AG1051', 'Elettro', and 'M28'; Mid-jumbo (100-140 g) 'Filinta', 'Petrus', and 'Sirma'; Jumbo (over 180 g) 'Alyans', 'Borneo', and 'Ceylin') were tested. Selection was made by weighted ranking method. Four rootstock genotypes were selected as 'Beaufort', 'Maxifort', 'Yedi' and 'Resistar' of which resistance against drought stress decreased in order. Among the tested cultivars; 'M28', 'Petrus' and 'Alyans' were selected according to response to drought stress that 'M28' and 'Alyans' were determined as resistant and sensitive, respectively. On the other hand 'Petrus' gave intermediate values in this respect. In the third step, the selected tomato cultivars were grafted on the selected rootstocks, and themselves (self grafted). It was determined that grafting increased the drought tolerance of tomatoes depending on the genotype of the rootstock.Öğe Influence of Potassium and Calcium Levels on Severity of Tomato Pith Necrosis and Yield of Greenhouse Tomatoes(Int Soc Horticultural Science, 2009) Ustun, N.; Altunlu, H.; Yokas, I.; Saygili, H.; Saygili, H; Sahin, F; Aysan, YTwo greenhouse experiments were carried out between the years of 2004-2006 in Aegean Region of Turkey to determine the influence of different potassium and calcium levels on severity of tomato pith necrosis caused by several pathogens belonging to genus Pseudomonas and Erwinia. The influence of three potassium (100 ppm, 200 ppm and 400 ppm) and two calcium (60 ppm and 120 ppm) levels on pith necrosis caused by four different bacteria (P. corrugata, P. cichorii, P. viridiflava and E. carotovora subsp. carotovora) were determined. The experiments were arranged on a greenhouse bench using a factorial randomized plot design with 30 characters and 3 replications. The plants were inoculated artificially two mounts after transplanting by spraying bacterial suspension (10(8)cfu/ml) onto the pruning sites. Lengths of pith necrosis were evaluated according to 0-5 scale two mounts after inoculation. The yields of the plants were measured for each treatment. In both of the experiments differences in potassium and calcium levels influenced the response of the plants to tomato pith necrosis and significant differences between treatments were observed. Two years results showed that treatments comprising highest levels of potassium (400 ppm) and calcium (120 ppm) not only reduced disease index significantly for most of the bacteria, but also led to the highest yield. http://www.actahort.org/books/808/index.htmÖğe Optimization of suitable tests for rapid screening of tomato genotypes for drought stre ss tolerance at seed germination and vegetative development stages(Ege Universitesi, 2022) Altunlu, H.; Çoban, G.A.; Gül, A.Objective: This study was conducted to determine the suitability of drought stress induced by PEG-6000 for rapid screening of tomato genetic resources against drought stress. Material and Methods: Two cultivars; M28 F1 and Alyans F1 known as tolerant and sensitive, respectively; were tested. In seed germination test, two different PEG concentrations (4% and 6%) were compared with the control. The seedling stage test was performed in water culture. In this experiment, (1) bare rooted seedlings of which rooting medium were removed and (2) seedlings with rooting medium were used. Drought dose was ?s= -1.0 MPa (full dose) and gradually increased (-0.25, -0.50, -0.75 and -1.0 MPa) every 48 hours from 7 days after planting. Results: In seed germination test, the decrease in vigour index under drought stress was lower in M28 variety. In water culture, stress symptoms appeared slowly if the seedlings with rooting medium were used. The decrease in plant growth characteristics, and chloropyll, carotenoid and relative water content and increase in proline content under stress were lower in M28 Conclusion: It was concluded that the seed germination test by 4% PEG-6000 and water culture in which the drought stress was created by PEG-6000 (?s= -1.0 MPa) can be used to screen tomato genetic matierials for drought stress tolerance. © 2022 Journal of Agriculture Faculty of Ege University. All right reserved.
