Time-course analysis of salicylic acid effects on ROS regulation and antioxidant defense in roots of hulled and hulless barley under combined stress of drought, heat and salinity

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dc.contributor.authorTorun, Hülya
dc.date.accessioned2020-04-30T23:34:48Z
dc.date.available2020-04-30T23:34:48Z
dc.date.issued2019
dc.departmentDÜ, Ziraat Fakültesien_US
dc.descriptionWOS: 000457926200007en_US
dc.descriptionPubMed: 29984429en_US
dc.description.abstractGreater crop losses can result from simultaneous exposure to a combination of drought, heat and salinity in the field. Salicylic acid (SA), a phenolic phytohormone, can affect a range of physiological and biochemical processes in plants and significantly impacts their resistance to these abiotic stresses. Despite numerous reports involving the positive effects of SA by applying each abiotic stress separately, the mechanism of SA-mediated adaptation to combined stresses remains elusive. This study, via a time-course analysis, investigated the role of SA on the roots of hulled and hulless (naked) barley (Hordeum vulgare L. Tarm' and ozen', respectively), which differed in salt tolerance, under the combined stress of drought, heat and salt. The combined stress caused marked reductions in root length and increases in proline content in both genotypes; however, Tarm exhibited better adaptation to the triple stress. Under the first 24h of stress, superoxide dismutase (SOD; EC.1.15.1.1) and peroxidase (POX; EC.1.11.1.7) activity in the Tarm roots increased remarkably, while decreasing in the ozen roots. Furthermore, the Tarm roots showed higher catalase (CAT; EC 1.11.1.6), ascorbate peroxidase (APX; EC 1.11.1.11) and glutathione reductase (GR; EC 1.6.4.2) activity than the ozen during the combined stresses. The sensitivity of hulless barley roots may be related to decreasing SOD, POX, CAT and GR activity under stress. Over 72h of stress, the SA pretreatment improved the APX and GR activity in Tarm and that of POX and CAT in ozen, demonstrating that exogenously applied SA regulates antioxidant defense enzymes in order to detoxify reactive oxygen species. The results of this study suggest that SA treatment may improve the triple-stress combination tolerance in hulled and hulless barley cultivars by increasing the level of antioxidant enzyme activity and promoting the accumulation of proline. Thus, SA alleviated the damaging effects of the triple stress by improving the antioxidant system, although these effects differed depending on characteristic of the hull of the grain.en_US
dc.description.sponsorshipDuzce University Research Foundation [2014.11.01.283]en_US
dc.description.sponsorshipThe author would like to thank Nuriye Peaci for her corrections and suggestions for the English grammar in this manuscript. This work was supported by funding from the Duzce University Research Foundation (2014.11.01.283).en_US
dc.identifier.doi10.1111/ppl.12798en_US
dc.identifier.endpage182en_US
dc.identifier.issn0031-9317
dc.identifier.issn1399-3054
dc.identifier.issue2en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage169en_US
dc.identifier.urihttps://doi.org/10.1111/ppl.12798
dc.identifier.urihttps://hdl.handle.net/20.500.12684/5226
dc.identifier.volume165en_US
dc.identifier.wosWOS:000457926200007en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakPubMeden_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherWileyen_US
dc.relation.ispartofPhysiologia Plantarumen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.titleTime-course analysis of salicylic acid effects on ROS regulation and antioxidant defense in roots of hulled and hulless barley under combined stress of drought, heat and salinityen_US
dc.typeArticleen_US

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