INCREASING DROUGHT TOLERANCE OF TOMATO PLANTS BY GRAFTING
The experiment was conducted in 3 steps in a growth chamber by aerated nutrient solution culture. Drought stress was fixed as Ψs=-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 Sırma; 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.
Altunlu, H. and Gul, A. (2012). INCREASING DROUGHT TOLERANCE OF TOMATO PLANTS BY GRAFTING. Acta Hortic. 960, 183-190
drought stress, weighted ranking method