Response of heat-stable tomato genotypes to Mi-1 virulent root-knot nematode populations

Abstract

Tomato is one of the most important vegetables cultivated worldwide. Many pests and pathogens cause significant yield decline in growing fields. Root-knot nematodes are known to be devastating pathogens on tomato. Resistant varieties carrying Mi-1 gene have been effectively used to control of root-knot nematodes. However, the efficiency of Mi-1 has been especially restricted by virulent root-knot nematode populations in cultivated tomatoes. Therefore, new resistant genetic varieties are required in growing fields. Heat-stable wild tomato species are known to be resistance to Meloidogyne populations at high soil temperature. To our knowledge, there are limited studies on response of heat-stable materials to different virulent root knot nematode populations under 28 oC. In the present study, reactions of heat stable materials to different virulent isolates of M. incognita and M. javanica were investigated at 24 oC soil temperature. Results showed that these materials did not confer resistance against M. incognita and M. javanica virulent isolates. Therefore, searching of new genetic sources resistant to virulent root-knot nematodes is required for breeding program

Keywords

• Nematode,resistance, vegetable, virulence

Mi-1 virülent kök-ur nematod populasyonlarına yüksek sıcaklıkta dayanıklı domates genotiplerinin tepkisi

Öz

Domates dünya çapında kültürü yapılan en önemli sebzelerden birisidir. Domates yetiştirilen alanlarda birçok zararlı patojen ve hastalık önemli ürün kayıplarına sebep olmaktadır. Kök-ur nematodları domatesin en önemli zararlısı olarak bilinmektedir. Mi-1 geni taşıyan dayanıklı çeşitler kök-ur nematodlarını kontrol etmede etkin şekilde kullanılmaktadır. Bununla birlikte Mi-1 geninin etkisi kültürü yapılan domateslerde, virülent kök-ur nematodları tarafından sınırlanmaktadır. Bu sebeple bu nematodlara dayanıklı yeni genetik çeşitlerin kullanılması gerekmektedir. Yüksek sıcaklığa dayanıklı yabani domates türlerinin yüksek sıcaklıkta Meloidogyne populasyonlarına dayanıklı olduğu bilinmektedir. Bu türlerin 28 oC’nin altındaki toprak sıcaklığında farklı virülent kök-ur nematod popülasyonlarına karşı tepkileri konusunda sınırlı sayıda çalışma bulunmaktadır. Bu çalışmada M. incognita ve M. javanica’nın farklı virülent izolatlarına yüksek sıcaklığa dayanıklı materyallerin tepkileri 24 oC toprak sıcaklığında testlenmiştir. Sonuçlar bu materyallerin M. incognita ve M. javanica virulent izolatlarına karşı dayanıklılık sağlamadığını göstermiştir. Bu sebeple ıslah programları için virülent kök-ur nematodlarına dayanıklı yeni genetik kaynakların araştırılması gerekmektedir

Anahtar Kelimeler

• Nematod, dayanıklılık, sebze, virülenslik

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