The Role of the Relationship between Hydrogen Peroxide and Nitric Oxide in Plant Tolerance to Abiotic Stresses

Öz

Hydrogen peroxide (H₂O₂)and Nitric oxide (NO) are signalling molecules that play an important role in different organisms. Even though intensive research in the past two decades, knowledge about the role of these two molecules interact with each other in abiotic stress tolerance and the relationship with biological processes aren’t completely elucidated yet. In this paper, H₂O₂ and NO cross-talk and possible role in plant responses to abiotic stresses such as drought, salinity, extreme temperatures, UV irradiation and heavy metals at the level of biosynthesis and gene expression and protein activities are investigated in light of recent literature. In addition, the cross-talk between H₂O₂ and NO with other signalling pathways in the regulation of abiotic stress responses in plants is also discussed.

Anahtar Kelimeler

• Abiotic stress; nitric oxide; hydrogen peroxide; signaling

Hidrojen Peroksit ve Nitrik Oksit İlişkisinin Bitkilerde Abiyotik Stres Toleransındaki Rolü

Öz

Hidrojen peroksit (H₂O₂)ve Nitrik oksit (NO), çeşitli organizmalarda önemli etkileri bulunan sinyal iletim molekülleridir. Son 20 yıldır yapılan yoğun çalışmalara rağmen, abiyotik stres toleransında bu iki molekülün birbirleriyle olan etkileşimlerinin rolü ve oluşturdukları sinyallerin biyolojik süreçlerle ilişkileri konusundaki bilgiler günümüzde de sınırlı düzeydedir. Bu makalede bitkilerin kuraklık, tuzluluk, aşırı sıcaklık, UV ışığı ve ağır metaller gibi abiyotik strese tepkide H₂O₂ ve NO etkileşiminin muhtemel rolleri ve biyosentez, gen ifadesi ve protein aktiviteleri düzeyinde son literatür verileri ışığında araştırılmıştır. Ayrıca bitkilerde abiyotik stres yanıtlarında yer alan diğer sinyal iletim yolakları ile H₂O₂ ve NO’nun arasındaki etkileşimler tartışılmıştır.

Anahtar Kelimeler

• Abiyotik stres; nitrik oksit; hidrojen peroksit; sinyal iletimi

Kaynakça

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