Protection of plants. Mushrooms, illnesses a plant and stability to illnesses

you are: Protection of plants

The Majority of illnesses of plants is caused by parasitic mushrooms. To cause an infection, dispute of one of such mushrooms (enough the small, colourless, threadlike organisms close by the nature to plants) should get on a surface.rastenija here again to sprout.

Growing from floccus disputes gets into vegetative cages from which geterotrofnyj the mushroom extracts nutrients. Thus the mushroom causes in a plant symptoms the illnesses connected or with damage of cages, or with action of mushroom toxins. Plants have various mechanisms for protection against such intrusion; in effect, already that fact that mushrooms, as a rule, amaze only one any kind of plants or group of related kinds, testifies that other plants are steady against them owing to those or other reasons. Even among susceptible kinds it is often possible to find out copies of plants, in some measure the steady. Selectors use this circumstance at deducing of new, disease-resistant grades by a selection and crossing method.

Bolezneustojchivost of plants can have the most different nature. More often than others is so-called structural stability. If the plant has thick kutikulu through which sprouting mushroom dispute not in condition to get one it can already prevent infection. second line of defence of plants is made by various their chemical components, besides from among secondary metabolitov (which as we already marked, serve plants as well for protection against insects and other rastitelnojadnyh animals). For convenience these chemical compounds divide on two groups, whether depending on that there are they at a plant even before infection (preexisting substances) or are formed in it in reply to infection. these two groups are in some measure blocked, but those substances, which maintenance before infection happens very low and sharply increases after infection, it is accepted to carry to the second group.

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