study of relationship between of vegetative traits and resistance to take-all disease in greenhouse condition

take-all disease of wheat (gaeumannomyces graminis var. tritici) (ggt) is one of the most destructive root diseases in the world. it has not been introduced resistant genotype against this disease. in this study, 416 genotype of bread wheat, received from different location of iran and other countries, were evaluated to take-all (t-41 isolate) in greenhouse conditions. root dry weight, shoot dry weight, biological dry weight, amount of root and crown infection (disease score), disease index (di), height, grain weight and number of seed were measured. analysis of variance showed significantly different among genotypes. winter genotypes are more resistant to take-all disease. also in some genotypes, infected plants had root system more extensive and have produced additional roots and some infected genotypes of winter types were headed in the greenhouse without vernalization.  probably, this fungus have vernalization effect on some winter wheat genotypes.  root dry weight and disease index were and negatively correlated (-0.510***). the genotypes were classified into six groups on the basis of mean scores. the groups are; 11 genotypes were in highly resistant group (sc = 0), 59 genotypes in resistant (0