Roots and root tumors

the roots of many plants have established symbic relationships
microorganisms
in the soil, forming roots or root tumors on plants. The roots of certain seed plants are
the soil
symblosis of fungi, called roots. According to the case of fungus leaching the host cortical cells, there are two types: (1) exogenetic roots, fungi form a layer, that is, mycelium, the whole encased in the outside of the young root, only a few mycelium into the cell gap of the root cortical layer, such as pine, eucalyptus and so on. (2) endogenetic root, fungi form a not obvious cover, and most of the mycelium is invaded into the root cortical layer of the cells, such as orchids, strawberries and so on. The mycelium of the mycobacteria, like the root hair, absorbs moisture and mineral nutrients. It also converts mineral salts and
organized
substances in the soil into nutrients that are easy for the host to absorb, as well as
vitamins
, which can be produced to supply the root system. The host plant secretes sugars,
amino acids
and other organic substances for fungal life, so the two are symbic relationship.
symbrosis of legume plants and root tumor bacteria, i.e. root tumors. The tube bundle of the root tumor is connected with the column of the root, and the two can exchange nutrients, on the one hand, the soy plant will supply water and nutrients to the growth of the root tumor bacteria, on the other hand, the root tumor bacteria will also fix the synthetic ammonium nitrogen, through the transmission of
tissues
to the host plant.