Molodchenkova O. Biochemical mechanisms of cereals plant defense reactions at the fungus infections and other unfavourable conditions

The dissertation represents theoretical basis and new approaches to decision of scientific problem connected with identification of biochemical mechanisms development of plant cereals defense response to biotic and abiotic factors. Еxamination of activity of lectins, lipid metabolism enzymes, phenylalanine ammonia-lyase, oxiding and antioxiding processes, contents of signal moleculs (hydrogen peroxide, salicylic acid and nitrogene oxid) resulted in determination of biochemical principles of peculiarities development of formation of defense reaction of different species of cereals upon infection of agents of fusariose, Alternaria alternata, Bipolaris sorokiniana, in conditions of water deficiency, hyperthermia and influence of salicylic acid, lectins. In the dissertation for the first time was distinguished and carried out comparative study of biochemical characteristics of constituent elements of defense biochemical system (lectins, lipoxygenase) of control, infected and salycilic acid-treated seedlings cereals, shown their role in the formation of resistance mechanisms. Joint participation of hydrogen peroxide, salicylic acid and nitrogene oxid within the process of defense reaction formation of cereals upon infection of the fusariose agents was shown for the first time. The carried out research allowed to develop a conception of response reaction formation and connection of different cereal crops within the process of development of plant defense response to biotic and abiotic factors activity, to make theoretical grounds and experimentally realize new biochemical approaches to evaluation and tolerance of cereals to fungal diseases and abiotic stressors.