Evaluation agronomic traits of resistant and susceptible genotypes to take-all disease in bread wheat at field

Bread wheat is a valuable food sources that has been attacked by many diseases and reduces its quantity and quality. One of the major diseases of wheat is wheat take-all caused by Gaeumannomycs graminis var. tritici that is often prevalence in humid regions. Aim of this study was to evaluate bread wheat cultivars with different levels of resistance to take-all that had been selected from screening at greenhouse, in field conditions and study on relationship between the disease resistance index and agronomic traits and micronutrients. For this purpose, 15 genotypes were planted in infected and non-infected conditions at field and the traits: chlorophyll, carotenoids, flag leaf area, height, number of spikelets per spike, spike length, peduncle length, 100kernel weight, seed weight per spike, number of grains per spike, total grain weight per plant, biological weight, harvest index and micronutrients in grain (Fe, Mn and Zn) were measured. The amount of Fe (in grain) in infected treatment showed a significant increase in compared to control. Finally genotypes 485, 1528, 501, 8031 and 585 were better than the others in the point of above traits at infected environment. The results showed that disease index measured in the greenhouse had a negative correlation with plant height, seed weight per spike, flag leaf area, 100kernel weight and amount of grain iron in infected conditions at field shows that greenhouse evaluations can be used for selection of tolerant genotypes to take-all disease.