Effect of IAA and BAP on morphophysiological traits of lemon balm

To investigate the effect of indole acetic acid (IAA) and benzyl amino purine (BAP) on morphological and physiological traits of lemon balm, an experiment was conducted in a randomized complete block design with three replications in farm condition at Namin county, Ardebil province, Iran. Spraying was done using IAA and BAP in the rates of 100, 200 and 300 ppm. Application of IAA and BAP promoted plant height and branches length. However, the branches length was increased in low IAA concentrations. Leaf chlorophyll content was in maximum at 300 ppm of BAP and 100 ppm of IAA. Application of IAA increased canopy diameter. More IAA concentrations increased shadow diameter. Increasing in IAA concentrations caused reduction in node number. Number of lateral shoots increased in high concentration of BAP in addition, more plant biomass was produced in high concentrations of BAP and IAA. Foliar application of BAP caused increasing in number of leaf comparing IAA. Therefore, application of IAA and BAP can be considered as an appropriate option to improve yield in lemon balm.