HARMONE REGULATORY PATHWAY OF AUXIN AND ABA
AUXIN INTRODUCTION Auxin is a key plant hormone that in some way determines all processes of the growth and morphogenesis of plants. In the course of evolution, plants have formed a large number of systems that regulate the concentration of auxin in the organs and tissues at different stages of their development. The investigation of mechanisms of the auxin regulation, function, and the interaction with other regulatory cellular systems allows for understanding many aspects of the plant growth and development. As a main plant hormone, auxin determines completely different processes, such as gravitropism, phototropism, the formation of organs, tissues, and the root and stem architecture and the development and structure of the conduction system. The root and stem formation in plants is strictly coordinated with each other and requires an intensive exchange of signals between various organs and tissues, as well as the integration of the internal morphogenetic programs with a variety o...