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Oral: Promising Phenotyping Efforts for Understanding Genetic and Molecular Bases of Plant Disease Resistance


Unraveling the host-pathogen interaction via phenotyping and molecular characterization of resistance?Soybean as a case study.
S. CIANZIO (1) (1) Iowa State University, U.S.A.

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Plants suffer from many yield deterrents that have direct impacts on humans in terms of food security, and production-income. The interaction of pathogen, environment and host, is one deterrent amenable to genetic manipulation. Host genetic resistance is one of the most effective, efficient and ecologically sustainable means to protect yield. In the presence of pathogens, genetic resistance allows the final expression of yield potential. Soybeans will be used as a case study. I will use examples on how single gene resistance, and quantitative trait resistance impact screening results and the efficiency of breeding for resistant genotypes. The resistance inheritance mechanisms on the plant determines how to devise effective screening protocols and the corresponding scoring results to differentiate among genotypic resistance levels. The breeding challenge common to all resistance inheritance mechanisms, is to select genotypes via screening approaches that will identify resistant genotypes accurately, and repeatable across environments. Correct identification of the resistance genes/genotypes for advancement in the breeding process will result in the release of effective resistant cultivars and germplasms to protect yield. Molecular information to determine/confirm resistance is a tool that has opened new approaches to breeding.