The effect of drought stress on dry mather yield and essential oils of Anisum (Pimpinella anisum L.)

Anisum (Pimpinella anisum L.) is one of the aromatic herbal plants which has great export value. In order to investigate effects of drought stress on yield and essential oil in different populations of Anisum an experiment was conducted in alborz karaj stations in 2011. This research was caried out as a randomized complete block design with 4 replications. Main factors were 3 populations of the Anisum (sabzevar، kerman and jiroft) and sub factors were include 4 levels of drought stress (10، 30، 50 and 70 % water depletion). Effect of interaction between main and sub factors were different significant on essential oil stem at %1 level and stem yield، dry matter yield and essential oil yield at %5 level. Mean comparison of main and sub factors showed that highest root yield، stem yield and dry matter yield order 120، 712 and 1100 kg/ha belong to kerman population in 10% water depletion and highest essential oil stem (0. 89%) and essential oil leaf (0. 63%) belong to kerman population in 70% water depletion.