Presentation Transcript
Slide 1: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
Slide 2: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
Slide 3: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
Slide 4: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