Dynamics of cadmium resistance of maize seedlings and the content of soluble carbohydrates in terms of the presence or absence of thermal hardening

A study was made of the change in the stability of maize seedlings to the action of a 1 mM solution of cadmium acetate under the conditions of the presence or absence of pretreatment by hardening temperature (+ 40°C, 3 hours), as well as auxin (IAA). The formation of two funds of glucose and sucrose - free (SF) and compartmented (CF) in the shoots of maize under normal conditions and their redistribution under cadmium stress has been established. It is shown that thermal pretreatment, as well as exogenous IAA, contributes to a significant increase in the level of both SF and CF glucose under conditions of subsequent action of cadmium. It has been suggested that the stress induced change in the compartmentation of soluble sugars is a condition for the realization of their protective functions, which depend not so much on the amount of soluble sugars in the cells, but on their ability to metabolize. It is assumed that with short-term exposure to cadmium (the stress-reaction stage) both sugars pools provide a combination of an increased level of vital activity and sustainability, and with a longer-term (adaptation stage) they participate in the formation of metal resistance of plants.