Kadmiyum Toksisitesi Altındaki Buğdayda Salisilik Asidin Apoplastik Antioksidatif Sistem Üzerine Etkileri

Year 2023, Volume: 6 Issue: 1, 46 - 56, 17.12.2023

Deniz Tiryaki Ökkeş Atıcı Sinem Karakuş

https://doi.org/10.57244/dfbd.1298625

Abstract

Bu çalışmada Salisilik asit (SA) uygulamasının, kadmiyum (Cd) stresine maruz bırakılmış buğdayın (Triticum aestivum L.) Bolal çeşidine ait yapraklarındaki apoplastik antioksidan enzim (katalaz, peroksidaz ve süperoksit dismutaz) aktiviteleri ile lipid peroksidasyonu ve hidrojen peroksit miktarı üzerine etkileri araştırılmıştır. Bitkiler 22/20 oC’de toplam 18 gün büyütülmüşlerdir. Bitki yapraklarına 12. gün farklı konsantrasyonlarda (0.01, 0.1, 1 mM) SA uygulanmış ve bundan 3 gün sonra, bitkilerin yetiştiği ortama farklı konsantrasyonlarda (25, 50, 100 μM) Cd uygulanmıştır. On sekizinci gün bitki yaprakları araştırmamızda deney materyali olarak kullanılmışlardır. SA uygulamaları, 50 ve 100 μM Cd’de katalaz (CAT) aktivitesini artırırken POX aktivitesini düşürmüştür. 25 ve 50 μM Cd’e maruz kalmış buğday yapraklarında ise SOD aktivitesini genelde artırmıştır. Ancak, 100 μM Cd’de aktiviteyi düşürmüştür. SA uygulamaları, 25, 50 ve 100 μM Cd etkisi altındaki buğdayda lipid peroksidasyonunu (LPO) düşürürken 25 μM Cd’de SA’nın 3 konsantrasyonuda H2O2 miktarını artırmıştır. SA 50 μM Cd’de H2O2 miktarını artırmıştır. 100 μM Cd’de 0.01 ve 0.1 mM SA uygulamaları aktiviteyi artırırken, 1 mM ise düşürmüştür.
Sonuçlarımız bitkilere Cd stresine maruz kalmadan uygulanan SA’nın hem apoplastik antiokdidatif enzimleri hem de LPO ve H2O2 miktarlarını düzenleyerek bir koruma sağlayabildiğini göstermektedir.

Keywords

Apoplast, Triticum aestivum, kadmiyum, salisilik asit, antioksidan enzimler, hidrojen peroksit, lipid peroksidasyonu.

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