The effect of mycorrhizal species on the growth, essential oils, yield and morpho-physiological parameters of Lemon Balm (Melissa officinalis L.) under water-deficit conditions in Tabriz region

Two years experiment were conducted in 2016-2017 as split-plot based on randomized completely block design with three replications to morpho-physiological responses of Lemon Balm (Melissa officinalis L.) plant mycorrhizal fungi species treatments (control, Rhizophagus intraradices, Funneliformis mosseae, Glomus hoi and combined application all species) under different irrigation regimes (irrigation after 70, 100, 130 160 mm evaporation). In results, the highest oil yield was achieved at 100mm+application fungi. Irrigation 100 evaporation increased this trait by 33% compared 70 due increase essential percentage dehydration conditions, however, increasing drought stress led a significant decrease yield. terms physiological parameters, an proline content antioxidant activates. general according modifying destructive effects water deficit use mycorrhiza can lemon Balm. But aggravating deficiency conditions drastically reduce The founds could be helpful for herbal medicine researchers achieve high-quality drugs.