XVI International Botanical Congess

We studied the effect of salicylic acid on root growth of carrot and radish as part of several experiments to analyze the effect of salicylic acid on the physiology of some plant species. The work was carried out with seedlings of carrot and radish under greenhouse conditions. Salicylic acid was applied on shoots in concentrations from 10-3M to 10-7M. After eighty days in carrot and forty days in radish were harvested the plants, and root length, root fresh weight, and shoot fresh weight were measured. The results indicated that salicylic acid alter the growth of roots, because there was a significant increase in all the parameters measured in comparison with the control treatment. Salicylic acid can increase the length of roots as much as 40-60%.