Assessment of Changes in Some Biochemical Traits and Proteomic Profile of UCB-1 Pistachio Rootstock Leaf under Salinity Stress

Abstract

University of California at Berkeley I or UCB-1 pistachio rootstock is propagated from the cross between Pistacia integerrima male × Pistacia atlantica female. So far, no report has been presented on the proteomic profile of Pistacia genus. In this research, 7-month-old UCB-1 rootstocks that were produced by tissue culture method and grown in pots containing 1/3 perlite, 1/3 clay and 1/3 sand were exposed to the three different concentrations of NaCl including 0, 100 and 200 mM for 30 days in the controlled conditions in the greenhouse. In the first step, under these three different concentrations of NaCl, the content of malondialdehyde and activities of guaiacol peroxidase, superoxide dismutase, catalase and peroxidase were evaluated. Malondialdehyde content increased up to 100 mM NaCl and then decreased. Activities of guaiacol peroxidase, superoxide dismutase and catalase increased with increasing concentration of NaCl, while peroxidase activity reduced. In the second step, 0 and 100 mM NaCl were selected to evaluate changes in the proteomic profile of this rootstock using MALDI-TOF/TOF method. In this study, ribonucleoside-diphosphate reductase small chain, polcalcin Phl p 7-like and golgin subfamily A member 5 were identified for the first time in response to salinity stress and have not been previously reported to be involved in the response of plant under abiotic stresses. Moreover, in this study, five unknown proteins were identified in UCB-1 pistachio under salinity stress.