Türkiye’den toplanan yerel soğan çeşitlerinin soğan sak nematodu Ditylenchus dipsaci’ye dayanıklılık reaksiyonları

Abstract

A total of 27 accessions of different onion landraces from Turkey were screened for their resistance to stem and bulb nematode. The study was carried out in a growth chamber at 20°C, with a 16/8 h (light/dark) photoperiod and at 70% relative humidity. The plants were grown in 7 X 8 cm diameter plastic pots filled with a mixture of 45% sand, 45% clay loam soil, 10% organic matter. Two hundred nematodes in 10 µl nematode suspension were inoculated to each plant at the 3-4 leaves stage. Plants were harvested six weeks after inoculation and number of nematodes was counted. Onion landraces that had low nematode reproduction were subjected to a second screening test. The landraces were classified from moderately resistant to highly susceptible according to their nematode reproduction in comparison to susceptible standard cultivar Betapanko. Accession 30 had the lowest number of nematodes in the both experiments and was classified moderately resistant and moderately susceptible in the first and second experiments, respectively. The accessions 23 and 25 had lower number of nematodes relative to standard cultivar and were classified as moderately susceptible in conclusion.