Mycorrhiza

the roots of certain plants are combined with
fungi
in the soil to form a symbicate binding between the fungus and the roots. According to the characteristics of morphology and anatomy, it can be distinguished into exogenous and endogenous roots. Fungal mycelium in exogenesis (ectomgcorrhiza) tightly surrounds the young roots of plants, forming a flora. Some also extend some mycelium to the surrounding soil, but the mycelium rarely penetrates
cells
the root tissue. Mycelium spreads in the cell gap of the outer cortical layer of the root, forming a mesh mycelium. On the one hand, instead of the role of root hair, absorb water and nutrients, on the other hand, the secretion of
vitamins
and so on, can stimulate plant growth. The fungi that form the roots of exogenous bacteria, mainly the genus Amanita, Boletus and Tricholoma, are some species that form exogenous roots, mainly forest tree species, such as pine cypresses, beech and moths. Fungal myceliums in endomycorrniza are mainly present between thin-walled cells in the cortical cortical layer of the root and enter the cell, while less outside the root, do not form a bacterial sleeve. Plants with endogenetic roots generally retain root hair. The fungi are also mostly some of the species of bacteria. In symbic joints, mycobacteria are very closely related to plants. If the seeds of orchid plants can not germinate without the symbication of bacteria, the seedlings of azalea plants cannot grow without the symblosis of bacteria.