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GP 605 BREEDING FOR STRESS RESISTANCE                                                                                  (3L+0P) III

UNIT I
Nomenclature and classification of stresses. Nature and importance of viral, bacterial, fungal and other diseases, insect pests. Genetic, physiological and molecular mechanisms of disease and insect pest resistance. Host-parasite interaction-variation in pathogen and host, factors affecting host reactions, gene- for-gene concept, implications and significance in plant breeding.

UNIT III
Identification of pathogen variation, multipathotype testing, gene postulation using infection type data. Creation of artificial epiphytotics, screening techniques for breeding materials. Sources of  resistance, shuttle breeding, stability of resistance, gene deployment over time and space- resistance. Concepts of varietal blends, mixtures and multilines for disease resistance.

UNIT IV
Marker aided selection. Introgression of genes from the wild relatives of crop plants, pyramiding of resistance genes, elimination of linkage drag. Transgenics in the management of biotic stresses. Use of Bt toxins, rotease inhibitors, electins, chitinases and glucanases for insect pest management.

UNIT V
Importance and crop specificity of  stresses due to temperature, drought, salinity, alkalinity, Aluminium toxicity, water logging and excessive rains. Genetic and physiological mechanisms governing abiotic stress resistance. Breeding procedures for abiotic stress resistance in selected and important crop plants. Achievements in breeding crop plants for abiotic stress resistance.

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