Antioxidant Systems in Plants and Responses to Salt Stress

Abstract

Salt stress is one of the abiotic stresses that limit agricultural productivity. Salinity caused oxidative stress in plants by accelerating production and accumulation rate of active oxygen species such as superoxide radical, hydrogen peroxide, hydroxyl radical and singlet oxygen. However, plants have evolved an efficient antioxidant protective system by preventing the production or detoxifying active oxygen species. Enzymatic and non-enzymatic components of this system are responsible for protecting plants from oxidative damages. Plant species that can increase their antioxidant activity have generally been accepted to be resistant to salt stress. In this study, the components of antioxidant system and changes in these components under salt stress have been discussed.     

Keywords

• Antioxidant System,Oxidative Stress,Salinity

Bitkilerde Antioksidan Sistemler ve Tuz Stresine Verdikleri Yanıtlar

Öz

Tuz stresi tarımsal verimliliği kısıtlayan abiyotik stres faktörlerinden biridir. Tuz stresi bitkilerde süperoksit radikali, hidrojen peroksit, hidroksil radikali ve tekil oksijen gibi aktif oksijen türlerinin oluşum ve birikim hızlarını artırarak oksidatif strese neden olur. Ancak bitkilerde reaktif oksijen türlerinin oluşumunu engelleyerek ya da oluşan reaktif oksijen türlerini detoksifiye ederek koruma sağlayan etkili bir antioksidan sistem gelişmiştir. Bu sistemin enzimatik ve enzimatik olmayan bileşenleri bitkileri oksidatif hasarlarından korumaktan sorumludur. Tuz stresi altında antioksidan aktivitesini artırabilen bitki türlerinin tuza dayanıklı olduğu kabul edilmektedir. Bu derlemede antioksidan sistemin bileşenleri ve tuz stresi altında bu bileşenlerde meydana gelen değişimler tartışılmıştır.   

Anahtar Kelimeler

• Antioksidan Sistem,Oksidatif Stres,Tuzluluk.

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