STUDY OF THE RESISTANCE OF COMMON WINTER WHEAT GENOTYPES TO CAUSATIVE AGENTS OF BROWN LEAF RUST AND POWDERY MILDEW

Evgeniy Dimitrov, Zlatina Uhr, Blagoy Andonov

Abstract


The study was conducted in the period 2012-2015 on an infectious area in the experimental field from IPGR „K. Malkov“, Sadovo. The immune responses of 24 common winter wheat genotypes to the agents of brown leaf rust (Puccinia recondita f. tritici) and powdery mildew (Blumeria graminis f., tritici) have been investigated. The experience is set by block method (circular sowing) in three repetitions. A two-factor dispersion analysis was applied to assess the influence of the sources of variation (genotype, environment, and genotype x environment interactions) on the development and spread of brown rust and powdery mildew. To assess the genetic similarity a grouping of the studied breeding materials was done by a hierarchical cluster analysis. In the lines DB 213 and DB 313 a highly resistant reaction of brown rust was reported while the highly resistant reaction of the powdery mildew was characterized by the lines BC 7 and DB 295. It was found that the genotypes Fermer, Yoanna, Niki, DB 213, BC 7 and DB 295 have a complex resistance to both phytopathogens studied. Samples characterized by high resistance and complex stability with success can be used in immunoselection as sources of source selection material. The most important influence on the development of brown leaf rust has the genotype, whereas the growing conditions are of primary importance for the distribution of the powdery mildew. On genetic differences between the tested breeding material dendrogram shows that line DB 295 is genetically the most remote relative to the specimens falling in the first and second cluster groups, in particular with the lines MX 217/69 / 3,5,7, DB 313, DB 380 and МХ 215/3.


Keywords


common wheat, brown leaf rust, powdery mildew, resistance, genotype, environment

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