Features of the Proline Synthesis of Pea Seedlings in Depend of Salt and Hyperthermia Treatment Coupled with Ionizing Radiation

The proline is an important amino acid that takes part on live cell protection as well as adaptation processes to adverse environment stress factors. The effects of ionizing radiation coupled with salinity or hyperthermia stress factors on pea seedlings were investigated. Different growth reactions and free proline content in root of the Pisum sativum L. seedlings for all treatments were evaluated. The received results of growth parameters show that some doses of ionizing radiation assists to plants in resistance to salt and temperature stressors, however this resistance is short-term. Deviation of plants reactions from additive effect to synergism or antagonism that can represent crosstalk of signal system was observed. This work proves that concentration of proline depends of stressors kind, their combinations and doses. The free proline level is a result of opposite processes of its synthesis and destruction, release and binding. The quantification of this amino acid is useful to assess the physiological status of signal systems crosstalk and more generally to understand stress tolerance of plants.