Bazı karpuz ve kavun genotip ve çeşitlerinin Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949 ırk 1 ile Meloidogyne javanica (Treub, 1885) Chitwood, 1949 (Tylenchida: Meloidogynidae) ırk 1 ve 3'e karşı reaksiyonlarının araştırılması

Öz

Kök-ur nematodları, kavun ve karpuz üretiminde ciddi ekonomik kayıplara yol açan önemli toprak kökenli patojenlerdir. Türkiye’de, özellikle Çukurova bölgesinde, bu zararlılara karşı dayanıklı genotiplerin belirlenmesine yönelik çalışmalar sınırlı kalmıştır. Bu çalışmada, 12 kavun genotipi, 12 karpuz genotipi ve her bir mahsulün üç ticari çeşidinin Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949 ırk 1 ve Meloidogyne javanica (Treub, 1885) Chitwood, 1949 (Tylenchida: Meloidogynidae) ırk 1 ve 3'e karşı tepkileri değerlendirilmiştir. Denemeler 2017-2020 yılları arasında Çukurova Üniversitesi Ziraat Fakültesi Bitki Koruma Bölümü ile Biyolojik Mücadele Araştırma Enstitüsü Müdürlüğü iş birliğinde ilgili laboratuvarlar ve seralarda gerçekleştirilmiştir. Sonuçlara göre, incelenen tüm genotipler her iki nematod türü ve ırklarına karşı farklı derecelerde duyarlılık göstermiş, tam direnç gözlenmemiştir. Bununla birlikte, Kav-216 (kavun) ve Kar-96 (karpuz) genotipleri, özellikle M. javanica ırk 1 ve 3’e karşı kısmi tolerans sergilemiş; bu genotiplerde en düşük yumurta sayıları ve gal indeksleri kaydedilmiştir. Elde edilen bulgular, önceki uluslararası çalışmalarla paralellik göstermekte ve Kav-216 ile Kar-96’nın dirençli anaç geliştirme çalışmalarında kullanılabilecek genetik kaynaklar olabileceğini düşündürmektedir. Bu çalışma, kök-ur nematodu direnci üzerine yürütülecek ıslah programlarına önemli katkılar sunmaktadır.

Anahtar Kelimeler

• Kavun
• direnç
• kök-ur nematodları
• tolerans
• karpuz

Investigation of reactions of some watermelon and melon genotypes and varieties to Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949 race 1 and Meloidogyne javanica (Treub, 1885) Chitwood, 1949 (Tylenchida: Meloidogynidae) races 1 and 3

Abstract

Root-knot nematodes are important soil-borne pathogens that cause significant economic losses in the production of melons and watermelons. In Türkiye, particularly in the Çukurova region, research into identifying resistant genotypes against these pests has been limited. This study evaluated the reactions of 12 melon genotypes, 12 watermelon genotypes, and three commercial varieties of each crop against Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949 race 1, and Meloidogyne javanica (Treub, 1885) Chitwood, 1949 (Tylenchida: Meloidogynidae) races 1 and 3. These experiments were conducted between 2017 and 2020 in collaboration with the Department of Plant Protection at the Faculty of Agriculture, Çukurova University, and the Biological Control Research Institute Directorate in the relevant laboratories and greenhouses. According to the results, all genotypes exhibited varying degrees of susceptibility to both nematode species and races, with no complete resistance observed. However, Kav-216 (melon) and Kar-96 (watermelon) showed partial tolerance, particularly against M. javanica races 1 and 3, with the lowest egg counts and gall indices recorded in these genotypes. These findings are consistent with previous international studies and suggest that Kav-216 and Kar-96 could serve as genetic resources in breeding programmes aimed at developing resistant rootstocks. This study makes an important contribution to breeding programmes focused on root-knot nematode resistance.

Keywords

• Melon
• resistance
• root-knot nematodes
• tolerance
• watermelon

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