Akademik Veri Yönetim Sistemi
TURKIYE ENTOMOLOJI DERGISI-TURKISH JOURNAL OF ENTOMOLOGY, cilt.42, sa.4, ss.313-322, 2018 (SCI-Expanded)
The Mi-1 gene conferring resistance to root-knot nematodes in tomato breaks down at soil temperatures above 28 degrees C. To understand this phenomenon, the reactions of susceptible and resistant tomatoes to Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949 were separately investigated under four soil temperatures, 25, 28, 30 and 32 degrees C, and at six time periods, 6, 12, 24, 48, 120 and 168 h. The study was conducted between 2015 and 2016 in growth chambers. In the first experiment, the plants were separately exposed to soil temperatures for the same six periods before nematode inoculation and then transferred to a growth chamber with 25 degrees C. Reproduction factor (Rf) for nematode on resistant plants was <1, while the Rf for susceptible plants was >1. Results indicated that the resistance provided by Mi-1 persisted under all soil temperatures. In the second experiment, the seedlings were simultaneously inoculated with M. incognita when soil temperatures reached 25, 28, 30 and 32 degrees C, and held in soil temperatures for the same six periods, then transferred to a growth chamber with 25 degrees C soil temperature. Rf in heterozygous resistant plants exposed to 32 degrees C soil temperature for >= 48 h was >1. This study indicated that the resistance in plants held at 32 degrees C soil temperature for >= 48 h lost its effect.