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This study was conducted to determine the agronomic traits of new sugar beet genotypes resistant to bolting in autumn-sown sugar beet planting regions including Khuzestan (Dezful), Ilam (Dehloran), and Fars (Darab and Zarqan) provinces based on randomized complete block design with four replications during two growing seasons (2016-18). Treatments included nine monogerm genotypes together with two foreign resistant cultivars and one susceptible cultivar as controls. The susceptible control cultivar, 9597, had less than 50% bolting in most of the years, therefore climatic condition was not favorable for bolting emergence. On the other hand, due to the variance of the regions, combined analysis of variance was not possible. As a result, based on mean sugar yield, hybrid 1 [(FC607*474)*Pool-PC-F2-HSF-60-P.3] produced 7.25 t sugar over controls and other hybrids. In terms of bolting percentage, hybrid 8 [(478*7112-6)*32877] with lowest bolting (0.77%) was superior to all genotypes (control and hybrids). These results showed that, because of the complexity of bolting trait, it is better to follow a specific breeding program for each region to obtain bolting-resistant cultivars.Keywords: autumn-sown, bolting, genotype, sugar beet
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