Abstract
Productivity of safflower (Carthamus tinctorius L.) is markedly reduced by salt stress. This study is based on analysis of proteins profile of safflower plants treated with 200 mM NaCl, with exogenously applied salicylic acid (SA) and penconazole (PEN), as growth regulators. Plants were investigated through a gel-based proteomic approach, which resulted in the identification of 17 salt-responsive proteins related to different metabolic modifications. Of these, seven different proteins were up or down regulated by both SA and PEN, suggesting the synergistic and antagonistic effects of SA and PEN. The classification of differentially expressed proteins showed that salt-responsive proteins were mainly involved in photosynthesis, ion homeostasis, and oxidative stress response, as well as nitrogen, protein, and carbohydrate metabolism. The identified stress-responsive proteins in this study could pave the way to develop salt tolerance in safflower, thus sustaining its productivity under salinity. In addition, SA and PEN may be considered as a foliar application to ameliorate salinity effects, due to their low price and availability.
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