Tolerance ranges and heat shock protein HSP70 synthesis pattern in Malva sylvestris ‘Krasavka' and M. pulchella 'Sylva' were analyzed under high temperature, soil flooding and drought. Juvenile plants of the species showed close tolerance ranges; at that, M. sylvestris was some more thermotolerant and more sensitive to flooding, comparatively to M. pulchella. Western-blot analysis revealed the identical spectrum and equal basic level of the cytosolic HSP70s in the related species, as well as similar stressor-specific pattern of their synthesis. High thermo- and drought tolerance of the species corresponded to their ability to long and intensive synthesis of the constitutive and inducible proteins, which increased at near lethal doses. The stress reaction to flooding included a rapid, but short activation of the inducible HSP70 synthesis and a decrease in the content of the constitutive protein for the first hours that could be protective under short waterlogging and associated with the inability of the species to long-term survival in such conditions. Species-specific differences related to the time course and magnitude of the HSP70 synthesis. The obtained results suggest that molecular mechanisms underlying the high tolerance in plants include the ability to extended and intensive synthesis of both inducible and constitutive HSP70s under long-term influence of an unfavorable factor.

Keywords: Malva sylvestris, M. pulchella, tolerance range, stress reaction, heat shock proteins 70

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