Resistance vs. tolerance

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Resistance vs. Tolerance Resistant Susceptible Degree of susceptibility decreases Degree of tolerance decreases Reducing the number of lesion would increase the resistance Reducing the size of lesion would improve the tolerance

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Pathogen Host Most active stage Most appropriate stage for attack No symptom Immune Area covered by disease 5% Susceptibility ….. 100 g/plant tolerant Up to 40% extra source is present (than sink) in plants Healthy plant yield = 100 g/plant 10% 95g/plant 25% 80g/plant 20% area covered Plant 1 Plant 2 Plant 3 Plant 4 Plant 5 Plant 6 Yield: 100 g 80 g 75 g 55 g 45 g 30 g Tolerance is decreasing 40 small lesions = 15 big lesions If Area covered by both is equal Area covered by disease reflects hosts susceptibility/tolerance Resistance vs. Tolerance

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Resistance vs. Tolerance 1/2 Half Filled Half Empty Less than half filled More than half empty CASE 3 CASE 4 CASE 3 If, Filled is = IMMUNE Empty = SUSCEPTIBLE Immune Susceptible Moderately resistant Moderately susceptible Partially resistant Partially susceptible 60oC 43oC Dies Dies 60% damage 40% damage 0.00 g 0.00 g 40.00g 60.00 g Reaction Yield Normal conditions 100 g 100 g CASE 2 CASE 1 CASE 2: Completely filled Completely Empty CASE 1: Both susceptible Tolerance < tolerance (susceptible) Threshold

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Resistance vs. Tolerance Monogenic with complete dominance Polygenic resistance Lesion present or absent Monogenic with partial dominance Lesion size variable Lesion size and number variable Monogenic with modifiers Lesion size variable RR X rr 3: 1 F2 1: 2: 1 F2 Other than 3:1 F2 Other than normal Mendalian inheritance AA x aa F1 Aa F2 1AA 2Aa 1aa

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