Kuraklık Stresi Altında Farklı Priming Uygulamalarının Buğdayda Çimlenme ve Fide Büyümesi Üzerine Etkileri

Year 2022, Volume: 10 Issue: 2, 303 - 311, 28.12.2022

Eda Günay , Müge Teker Yıldız , Okan Acar

https://doi.org/10.33202/comuagri.1149497

Abstract

Buğday (Triticum aestivum L.), kurak alanlarda yaygın olarak yetiştirilen bir tarım ürünüdür. Ancak kuraklık, dünya tarım alanlarında bitkisel üretim için en sınırlayıcı çevresel stres faktörlerinden biridir. Priming, çimlenmeden önce metabolik süreçleri iyileştirmek için tohum hidrasyonu ve kurutmayı içeren fizyolojik bir tekniktir. Bu çalışmanın amacı dört farklı priming uygulamasının (hormo-priming (gibberellik asit, GA3), redoks priming (hidrojen peroksit, H2O2), ozmo-priming (polietilen glikol, PEG) ve termo-priming (38oC)) kuraklık stresi altındaki yerel bir ekmeklik buğday çeşidinin (cv. Ekiz) çimlenme yüzdesi, sürgün-kök uzunluğu, toplam klorofil içeriği (SPAD), bağıl su içeriği (BSİ), spesifik yaprak alanı (SYA) ve H2O2 miktarı üzerine etkilerini belirlemektir. Kuraklık stresi, H2O2 içeriğini arttırırken tohum çimlenmesini, sürgün-kök uzunluklarını, SYA, SPAD ve BSİ'yi önemli ölçüde azaltmıştır. Termo-priming uygulamaları, kontrol bitkilerine kıyasla kuraklığın klorofil miktarı ve çimlenme üzerindeki olumsuz etkilerini tamamen iyileştirmiştir. Bununla birlikte, sürgün-kök uzunlukları, kontrol bitkilerinin sadece yarısı düzeyinde iyileşmiştir. Kuraklık stresi tohum çimlenmesini %14 oranında azaltırken, hormo-priming uygulaması tüm tohumların çimlenmesini sağlamıştır. Diğer priming uygulamalarının aksine, hormo-priming ve ozmo-priming uygulamaları BSİ'yi arttırmıştır. Sonuç olarak, kuraklık stresine dayanıklılıkta cv. Ekiz için termo-priming ve ozmo-priming uygulamaları diğer priming uygulamalarından daha etkili olduğu bulunmuştur.

Keywords

Buğday, Kuraklık toleransı, Ozmotik stres, Priming

Supporting Institution

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Project Number

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Thanks

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Effects of Different Priming Treatments on Germination and Seedling Growth of Wheat under Drought Stress

Abstract

Wheat (Triticum aestivum L.) is a widely cultivated agricultural crop in dry areas. However, drought is one of the most limiting environmental stress factors for crop production in the world's agricultural areas. Seed priming is a physiological technique involving seed hydration and drying to improve metabolic processes before germination. The aim of this study is to determine the effect of four different priming treatments (hormo-priming (gibberellic acid, GA3), redox-priming (hydrogen peroxide, H2O2), osmo-priming (polyethylene glycol, PEG) and thermo-priming (38oC)) on total chlorophyll content (SPAD), relative water content (RWC), specific leaf area (SLA), H2O2 amounts and shoot-root lengths in a local wheat variety (cv. Ekiz). Drought stress significantly decreased seed germination, shoot-root lengths, SLA, SPAD and RWC while increasing H2O2 content. Thermo-priming treatments fully improved the negative effects of drought on chlorophyll amount and germination compared to control plants. However, shoot-root lengths improved only in half level of control plants. While drought stress decreased seed germination by 14%, hormo-priming treatment ensured germination of all seeds. On the contrary of other priming treatments, hormo-priming and osmo-priming treatments increased RWC. Consequently, thermo-priming and hormo-priming treatments found most effective than the other priming treatments in drought stress resistance for cv. Ekiz.

Keywords

Drought tolerance, Osmotic stress, Seed priming, Wheat

Project Number

Yok

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