Mualla KETEN, Hasan DEĞİRMENCİ, Ramazan Şadet GÜVERCİN

Kısıntılı Sulama Koşullarında Bazı Pamuk (Gossypium hirsutum L.) Genotiplerinin Kuraklık Toleransının Belirlenmesi

Bu çalışmanın amacı, sulama suyunda belirli oranlarda kısıntıyaparak suyu daha verimli kullanmak ve kuraklığa toleransı yüksekpamuk genotiplerini belirlemektir. Çalışmada 7 farklı genotip (Aday1, Aday 2, Aday 3, Aday 4, Aday 5, Aday 6 ve Aday 7) ve Stonville 468pamuk çeşidi kullanılmıştır. Kuraklık toleransını belirlemek içinStres Duyarlılık İndeksi (SSI), Verim Kararlılık İndeksi (YSI), VerimAzalma Oranı (Yr), Verim İndeksi (YI), Toleranslılık İndeksi (TOL),Ortalama Verimlilik (MP), Harmonik Ortalama (HM), GeometrikOrtalama Verimliliği (GMP), Modifiye Edilmiş Stres Toleranslılıkİndeksleri (K1STI-potansiyel verim değerlerinden elde edilerekhesaplanan indeks, K2STI- stres koşullarında elde edilen verimdeğerleriyle hesaplanan indeks) ve Stres Toleranslılık İndeksi (STI)kullanılmıştır. HM, MP, GMP, STI, K1STI indekslerinin stresli vestressiz koşullarda uygulanabilirliği Aday 4 genotipinde görülmüştür.En yüksek MP değeri, Aday 6 genotipinde bulunmuştur.. En düşükSSI indeksi Aday 2’de bulunmuş ve kuraklığa toleranslı olduğunugöstermiştir. Ortalama karşılaştırma (LSD), temel bileşenler analizi(PCA) ve kümeleme (Cluster) analizi sonucunda Aday 2 genotipininkuraklığa yüksek oranda toleranslı olduğu görülmüştür.

Determination of Drought Tolerance for Some Cotton Genotypes (Gossypium hirsutum L.) under Deficit Irrigation Conditions

The aim of this study was to use water more efficiently and determine drought-tolerant cotton genotypes by reducing the irrigation water at certain rates. In this study, 7 different cotton genotypes (Aday 1, Aday 2, Aday 3, Aday 4, Aday 5, Aday 6, and Aday 7) and a control variety (Stonville 468) were used. In order to determine drought tolerance, parameters including Stress Susceptibility Index (SSI), Yield Stability Index (YSI), Yield Reduction Ratio (Yr), Yield Index (YI), Tolerance Index (TOL), Mean Productivity (MP), Harmonic Mean (HM), Geometric Mean Productivity, Modified Stress Tolerance (K1STIindex calculated from potential yields, K2STI- index calculated from yield values in stress conditions) Stress Tolerance Index (STI) and Yield Strength Index (YSI) were used. Stressed and non-stress conditions applicability of HM, MP, GMP, STE, K1STI indices has appeared in Aday 4 genotypes. The highest value of MP was found in Aday 6 genotype. The lowest SSI index was in genotype Aday 2. As a result of the mean comparison (LSD), principal component analysis (PCA) and cluster analysis, the Aday 2 genotype was found highly tolerant to drought under non stress conditions.

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