مقایسه ی بیماری‌زایی Meloidogyne javanica روی ارقام مختلف چغندرقند

Root-knot nematodes (Meloidogyne spp.) and Sugar beet cyst nematode (Heterodera schachtii) are considered as most important limiting factors in sugar beet cultivation. Sugar beet fields in different provinces of Iran are infested with one of these plant parasitic nematodes and even both of them. One of the appropriate methods for controlling these nematodes is the use of resistant cultivars. In order to evaluate the response of selected genotypes of sugarbeet to Meloidogne javanica, twenty cultivars including commercial cultivars resistant to cyst nematode including Fernando, Succara, Sanetta, Toucan, Pauletta, BTS 213 and some selected genotypes of sugar beet seed institute included SBSI 035, SBSI 041, SBSI 042, SBSI 043, SBSI 044, SBSI 060, SB 33, SB 33-HSF-3, SB 33-HSF-5, SB33-HSF-6, SB33-HSF-8, S1-930620, S1-930468 and sharif, were evaluated in greenhouse conditions. This experiment was conducted in a completely randomized design with 10 replications for each cultivar in a greenhouse with a controlled temperature of 23-25 ° C. To evaluate the reaction of the cultivars, after the time needed, seedlings were inoculated with 1000 second-juveniles of Meloidogyne javanica. After 70 days of kept in controlled conditions, the number of galls on root, number of eggs on root and number of larvae in the soil were counted. The genotypes examined showed different reactions to Meloidogyne javanica. Some genotypes including SBSI 035, SBSI 041, SBSI 042, SBSI 043, SBSI 044, SBSI 060, SB 33, SB 33-HSF-3, SB 33-HSF-5, SB33-HSF6, SB33-HSF-8 , S1-930620 with the number of galls less than 10 on the root, were placed in resistance groups and some cultivars included Fernando, Succara, Sanetta, Toucan, Pauletta, BTS 213 and S1-930468 with the number of gall near the control or more gall number on the root system, were considered as sensitive.