Effects of Abscisic acid, Paclobutrazol and Uniconazole hormones on the control of Egyptian broomrape (Orobanche aegyptiaca. Pers) and growth indexes of tomato (Lycopersicon esculentum Mill.)

In order to evaluate of Abscisic acid, Paclobutrazol and Uniconazole hormones effects on the Egyptian broomrape (Orobanche aegyptiaca. Pers) control and growth indexes of tomato (Lycopersicon esculentum Mill.), a glasshouse experiment was conducted in CRD design with four replications. Treatments consisted of Abscisic acid in 4 levels (1, 3, 5 and 7 mM), Paclobutrazol in 2 levels (0.1 and 0.01 mM) and Uniconazole in 4 levels (1, 2, 3 and 4 mM) and two control treatments of weed free and weed infested treatments, respectively. The results eliminated that Results showed that the treatments of Abscisic acid (5 and 7 mM), Paclobutrazol (10-4 and 10-5 mol) and Uniconazole (3 and 4 mM) decreased significantly broomrape nodules on the tomato roots, number of stems and broomrape shoot dry weight. But in the case of tomatoes traits, Paclobutrazol treatment in both concentrations of 0.1 and 0.01 mM reduced shoot dry weight, plant height and leaf area of tomato and produced the lowest leaf area ratio and specific leaf area compared with the control treatment (without broomrape). In general, it can be concluded that Abscisic acid (5 and 7 mM) and Uniconazole (3 and 4 mM) hormones had better results in the control of broomrape and lower limit of tomato growth and about Paclobutrazol, despite the favorable effect on broomrape control but in terms of decreasing treatments of tomato it is better tested at low concentration.