Effect of Drought Acclimation on Drought Stress Resistance in Okra Seedlings

Öz

Öz Bu çalışmada bamyada (Abelmoschus esculentus L.) fide döneminde kuraklık aklimasyonunun etkileri araştırılmıştır. Bu amaçla, aklimasyon yapılmamış ve stressiz (NA), aklimasyon yapılmış ve stressiz (DA), aklimasyon yapılmamış ve kuraklık stresli (NAS), aklimasyon yapılmış ve kuraklık stresli (DAS) olmak üzere dört farklı sulama uygulaması yapılmıştır. Uygulamaların bamya fidelerinin bitki boyu, gövde çapı, bitki taze ağırlığı, bitki kuru ağırlığı, kök taze ağırlığı, kök kuru ağırlığı, yaprak alanı, yaprak bağıl su içeriği (LRWC), klorofil değeri (SPAD), klorofil içeriği (a, b ve toplam klorofil), hidrojen peroksit (H2O2) içeriği, malondialdehit (MDA) içeriği ve antioksidan enzim aktivitesi (CAT, POD ve SOD) gibi parametreler üzerine etkisi incelenmiştir. Kuraklık stresi (NAS), bitki büyüme parametreleri üzerinde olumsuz bir etkiye sahipken, DAS'ın neden olduğu hasar daha düşük olmuştur. Ayrıca bitki boyu, gövde çapı, bitki taze ağırlığı, bitki kuru ağırlığı, kök taze ağırlığı, kök kuru ağırlığı, yaprak alanı, LRWC, SPAD ve klorofil içeriği DA ile en yüksek düzeyde olmuştur. Kuraklık stresi (NAS) ile H2O2, MDA ve antioksidan enzim aktivitesinde artış olmuş, DAS ile bu parametrelerdeki artış NAS uygulamasına göre daha düşük olmuştur. Çalışmada bamyada fide döneminde uygulanan kuraklık aklimasyonunun, normal koşullarda bitki büyümesine olumlu etkisinin yanı sıra kuraklık stresine karşı toleransı artırabileceği belirlenmiştir.

Anahtar Kelimeler

• drought
• tolerance
• okra
• plant growth

Kaynakça

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