02677nab a2200265 i 4500 publ6113 20190410091341.0 190410s2015 hu o 0|| angol d 0001-5296 10.1515/abcsb-2015-0008 doi 2998094 mtmt SZTE Publicatio Repozitórium hun angol Görgényi Miklósné Tari Irma The alleviation of the adverse effects of salt stress in the tomato plant by salicylic acid shows a time- and organ-specific antioxidant response. [elektronikus dokumentum] / Görgényi Miklósné Tari Irma 2015 21-30 ACTA BIOLOGICA CRACOVIENSIA SERIES BOTANICA 57 No. 1 In the last decade contradictory results have been published whether exogenous salicylic acid (SA) can increase salt stress tolerance in cultivated plants by inducing antioxidant response. Salt stress injury in tomato was mitigated only in that case if plants were hardened with high concentration of SA (~10-4 M), low concentrations were ineffective. An efficient accumulation of Na+ in older leaves is a well known feature of salt stress response of tomato (Solanum lycopersicum cv. Rio fuego) but it remains largely unexplored whether young and old leaves or root tissues have distinct antioxidant status during salt stress after hardening with 10-7 M or 10-4 M SA. Determination of superoxide dismutase (SOD) and catalase (CAT) activity revealed that the SA-induced transient increases in these enzyme activities in young leaf and/or root tissues did not correlate with the salt tolerance of plants. Salt stress resulted in tenfold increase in ascorbate peroxidase (APX) activity of young leaves and significant increases in APX and glutathione reductase (GR) activities of the roots hardened with 10-4 M SA. Both total ascorbate (AsA) and glutathione pools reached the highest level in the leaves after 10-7 M SA pre-treatment but in contrast to leaves, the total pool of AsA decreased in the roots under salt stress and thus, due to low APX activity active oxygen species were scavenged by ascorbate non-enzymatically in these tissues. The increased GR activities in the roots after treatment with 10-4 M SA enabled plants to enhance the reduced glutathione (GSH) pool and maintain the redox status of AsA under high salinity, which led to increased salt tolerance. Csiszár Jolán aut Horváth Edit aut Poór Péter aut Takács Zoltán aut Szepesi Ágnes aut http://publicatio.bibl.u-szeged.hu/6113/7/2998094.pdf Dokumentum-elérés