effect of sever water stress on the morphologic, quantitative and qualitative characteristics of 20 sugar beet genotype

this research was conducted in order to evaluate genetic diversity, and screening the tolerant genotypes of sugar beet subjected to continuous and severe water stress in the experimental farm of sugar beet seed institute (sbsi) in karaj in 2008. the experimental design was a randomized complete block with 6 replications. fifteen o-types which were tolerant to drought plus 5 (check) genotypes were evaluated. permanent and severe drought stress started by stop of irrigation after plant establishment continued to the end of growth season. the soil water suction reached to about 4 mpa in the horizon of 0-30 cm at the end of growth period. the results of anova showed that the effect of genotypes on the root yield, shoot dry weight, total dry weight, root dry weight, root dry weight/ shoot dry weight ratio, sugar yield, achievable sugar yield, sugar percentage, harmful nitrogen and sugar percentage were significant (p