EFFECT OF EXCESS IRON (II) IONS ON PHOTOSYNTHESIS PROCESSES IN BARLEY PLANTS

Abstract

It is known that all heavy metals (TM), including iron, affect the development of crops. At the same time TM affect both morphometric parameters of plants and physiological processes taking place in them. However, these processes and their changes as a result of adverse factors may differ not only in different plant species, but also in different varieties. This paper presents a study of changes in the content of chlorophylls a and b in leaves of different varieties of barley plants when excessive doses of iron (II) ions are added to the growing medium. As a result of the study, it was revealed that Fe2+ had a different effect on the content of green pigments and their ratio in the studied varieties of barley. At the same time, some varieties turned out to be more stable than others. In general, the content of chlorophyll a in the control version ranged from 17.45 (Belgorod 100) to 22.16 (29-11) mg/g; chlorophyll b - from 9.30 (Bionic) to 12.95 (29-11) mg/g. Photosynthesis processes are associated with the formation of proteins, fats and carbohydrates in plants. Therefore, this study will serve as a further basis for studying the relationship between disruptions in the processes of photosynthesis in crops and the formation of organic substances in them.