Phytopathological assessment of Azerbaijan origin bread wheat (Triticum aestivum L.) genotypes against yellow rust

Yellow rust (Puccinia striiformis f. sp. tritici) on bread wheat (Triticum aestivum L.) has resulted in significant reductions in the yield losses and wheat grain quality. Infection rate to yellow rust disease and evaluation of the SPAD value of 90 soft wheat genotypes we studied has been implemented in the conditions of the Absheron Peninsula, the territory of the Absheron Experimental Base of ANAS ( N. 40°24.001? , E. 49°49.001? , H. = 50 m. ) in 2017-2020 years. Infection rate to yellow rust disease was 0-100 S. An indicator of the SPAD value we studied has changed from 28.9 to 83.5 between genotypes. The average indicator of this symptom was 50.5. The sample with the highest SPAD value of the soft wheat genotypes we studied was genotype k9530 belonging to the Erythrospermum variety, which had an indicator of  83.5. Infection rate to the yellow rust of this sample was 0 and showed an immune reaction. Different variety, as can be seen from the appreciation of resistance rate for the yellow rust and the value of the SPAD had different infection rates and SPAD values. As a result of this evaluation, although there was partial conformity, full sameness was not observed. Some genotypes had high SPAD values as resistance to the yellow rust. The cluster analysis is based on the Euclidean distance index of the WARD method of the PAST statistical software package. The genotypes we studied have grouped into 6 main clusters according to indicated tokens. According to the euclidean distance index, the farthest genotypes of the cluster were genotype k9530 from the Erythrospermum variety and genotype k7252 from the Milturum variety (54.63).  It can be explained by the fact that they belong to different variety.