| Summary: | 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.
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