Effect of growth regulators on growth and yield of tomato cv. Roma parasitized by Orobanche.

摘要

A pot experiment was conducted in a polyethylene walk in a tunnel in Islamabad, Pakistan, during October 1995. Tomato cv. Roma parasitized by Orobanche was treated with different concentrations of gibberellic acid (GA3; at 10-1 M) as foliar spray and abscissic acid (ABA; at 10-5 and 10-6 M) as root dipping treatment. The application of growth regulators minimized the detrimental effect of parasite on the host. Foliar spray of GA3 at 10-4 M improved the productivity and performance of tomato plant in terms of nutrient content, plant height, plant vigour, dry weight and yield (1325.2 g). Root dipping in ABA at 10-5 M and 10-6 M also showed a positive effect on root dry weight, leaf P content of tomato and N content of both tomato and Orobanche. Among the treatments, the foliar spray of GA3 was the most effective method to increase the tolerance of tomato plant to the parasitism of Orobanche..