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The roothairs are important components of the root for absorbing nutrients for plants and also secreting the plant-produced secretes. Morphology and their number are influenced by various environmental and internal factors and are regulated by them. Mycorrhizal fungi are established through the root and their presence in the root can affect root’s physical and chemical properties.The aim of this study was to evaluate the effect of the presence of the fungus in the roots on the characteristics of the capillary roots.In order to remove the effect of other microorganisms on the results of the experiment, this experiment was performed in vitro on the roots of the carrot secondary phloem tissue culture. In this experiment, the fungus could affect the characteristics of the root hairs: their number (22% decrease in the root hairs number in the root hair area of the root) and their length (A decrease of 21.3% in the length of capillary roots in mycorrhizal plants). These changes in the characteristics of capillary roots were also caused by the presence of fungal structures in the roots as well as by the decrease in the production of strigolactones. In this study, changes in the production of strigolactones calculated by using their effect on seed germination of Phelipancheaegyptiaca. Keywords— Phelipancheaegyptiaca, Strigolactones, Capillary root’s length. Highlight: According to our results, the presence of mycorrhizal fungi can act as an alternative to root hairs. And their wide hyphae of these fungi can have the same function or better than the capillary roots for the plant. An important point in this regard is the sensitivity of the roots of plants from tissue culture after leaving the desirable condition of in vitro and entering the new environmental condition such as a field. Meanwhile, using Mycorrhizal fungi can provide a stronger guarantee for the ability of the roots of these tissue culture derived plants in the presence of mycorrhizal fungi inside them, in an out of glass environment. Abbreviation: In this experiment, which was carried out in tissue culture condition, the effect of mycorrhizal fungi on the number and length of capillary roots was investigated. The results showed that the presence of fungi in the root of the plant affected the amount of strigolactones production and reduced it. Following a decrease in the production of strigolactones, the number and length of root hairs also decreased. It was shown in this experiment that the presence of mycorrhizal fungi can act as an alternative to root hairs. And the wide hyphae of these fungi can have the same function or better than the capillary roots for the plant. An important point in this regard is the sensitivity of the roots of tissue culture plants after leaving the in vitro condition and entering the field. Meanwhile, using Mycorrhizal fungi can provide a stronger guarantee for the ability of the roots of these plants in the presence of mycorrhizal fungi inside them, in an out of in vitro condition.

Effect of Clariodeoglomusclariodeorum on morphology and abundant of carrot root hairs in vitro