واکنش تعدادی از ژنوتیپ‌های چغندرقند مقاوم به نماتد سیستی به ویروس پیچیدگی بوته چغندرقند

Similar to other plants, sugar beet (Beta vulgaris L.) is also attacked by several pests and pathogens. The curly top viral disease, rhizomania, the beet cyst nematode and root rot, are the main diseases of this crop in Iran. The beet curly top disease caused by several species of the family Geminiviridae, along with cyst nematode, have been reported from several provinces of the country. In this study, the reaction of 20 cyst nematode-resistant sugar beet genotypes to Beet curly top virus-severe was investigated in a completely randomized design with seven replications under greenhouse conditions (25° C ± 2). The 4-6 leaf stage plants were inoculated by virus-infectious clone, BCTV-Svr (BSCTV-IR). To evaluate the genotypes reactions, the disease severity, the greenness and chlorophyll indices were measured. The analysis of variance showed statistically significant differences of the reactions among genotypes. The genotype S1-960090 with the lowest symptoms and disease severity index 1.5 was placed in a separate statistical group and was introduced as a virus resistant cultivar. The genotypes Hadiya and S1-960284 had the highest disease severity and placed in the same statistical group with eight other genotypes. The results of the greenness and photosynthesis analyzes showed that S1-960090 and S1-920833 genotypes had the least amount of greenness index and were not statistically different. Also, the S1-960090 genotype had the highest amount of photosynthesis. According to the results of this experiment, the genotype S1-960090 is introduced as the resistant genotype for both pathogens, and is suggested as a suitable cultivar for both cultivation and breeding purposes.