Investigating the water requirement of the Borage medicinal plant based on the evaporation of water from the evaporation pan in terms of application of mycorrhizal fungi

Water shortage stress is one of the factors affecting medicinal plants, and on the one hand, the role of mycorrhizal fungus is important in improving the performance of some medicinal plants faced with water shortage stress. Therefore, for this purpose, an experiment on the medicinal plant borage (Borago officinalis L.) in the form of chopped plots in the form of a completely randomized block design with three replications in the years 2014 and 2015 in Boyer Ahmad region (Chamkhani Yasouj Agricultural Research Station ), was implemented. Water stress as the main factor in irrigation levels after 30, 60, 90, 120, and 150 mm of water evaporation from evaporation pan class A and mycorrhiza fungus as a secondary factor in non-application levels, application of Glomus mosseae species and application of Glomus intraradices species was considered. Based on the average comparison results, in the conditions of irrigation levels after 60, 90, 120, and 150 mm of water evaporation from the evaporation pan, the application of Glomus mosseae and Glomus intraradices fungi compared to the absence of mycorrhizal mushroom application caused a significant increase in the relative water content. (17.29 and 13.83 percent), (13.60 and 16.76 percent), (7.87 and 8.97 percent), and (19.92 and 15.65 percent) became plants. It shows that in these irrigation levels, mycorrhizal symbiosis increases the level of root absorption and absorbs more and better water from the soil, leading to a change in the speed of water movement inside and outside the plant, affecting tissue water absorption and leaf physiology. Subsequently, it has caused an increase in the relative water content of borage under water stress conditions. The interaction of irrigation and mycorrhizal fungus on the water consumption efficiency of borage was also significant. Based on the results of this study, irrigation treatment after 90 mm of water evaporation from the evaporation pan and application of mycorrhizal fungus G. mosseae is recommended as water requirement.