Epidemic fitness of Phytophthora infestans in foliage ... · 2005 Mondial 2006 Ia IIa Ib Mixture Ia...
Transcript of Epidemic fitness of Phytophthora infestans in foliage ... · 2005 Mondial 2006 Ia IIa Ib Mixture Ia...
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Epidemic fitness of Phytophthora infestans in foliage foliage and tubers as related to future developments developments of aggressiveness
Trudy van den Bosch and Geert Kessel
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Outline
IntroductionGoalsLaboratory experiments
Aggressiveness to foliageAggressiveness to tubers
Field experimentsSetupFoliar epidemicTuber infection
Discussion and conclusions
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Introduction
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Introduction
Sexual population
Clonal population
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Goals
Optimal set(s) of fitness parameters for survival of P. infestans in summer and winter?
Trade off’s between summer and winter survival?
Estimate optimal parameter set(s) for summer AND winter survival
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Potato cultivars and resistance levels
Cultivar Foliar resistance rating Tuber resistance rating
Karakter (Starch) 6 5
Mondial (Ware) 4.5 5.5
Remarka (Ware) 6.5 8.5
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P. infestans isolates and characteristics
Isolate Location Host Year Haplo type Mating type
NL00228 Dinteloord S. tuberosum 2000 Ib A2
NL01096 Katshaar S. tuberosum 2001 IIa A2
NL01900 Wageningen S. sisymbriifolium 2001 Ia A1
Ia Ib IIa Ia Ib IIa
P2 P4
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Differential interaction between cultivars & isolates
A B C
Ib IIa Ia Ib IIa Ia Ib IIa Ia
Karakter Mondial Remarka
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Laboratory experiments
Infection experiments on foliageIE, LP, LGR & SPOR
Infection experiments on tubersIEtuber & LGRtuber
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Infection experiments on foliageKarakter Remarka Mondial
IE [-]Ia 0.029 0.008 0.036IIa 0.008 0.008 0.023Ib 0.003 0 0.02
LGR [mm/ dag]Ia 3.8 2.5 3.7IIa 3.6 2.7 3.2Ib 2.1 0.2 3.7
SPOR [sp/ mm²]Ia 206 89 217IIa 143 101 208Ib 113 0 164
LP [dagen]Ia 5.1 6.1 5IIa 5.2 5.2 4.7Ib 7.4 >10* 4.6
R0 [-]Ia 1158 133 1543IIa 231 167 920Ib 63 0 635
r [dag-1]Ia 0.75 0.39 0.78IIa 0.55 0.45 0.68Ib 0.27 0 0.71
Skelsey et al 2005:
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Infection experiments on tubers
IEtuber on intact tuber eyes: (statistically significant cultivar effect)
LGRtuber: (statistically significant cultivar* isolate interaction)(LSD = 1.2)
Karakter (5) Mondial (5.5)
Remarka (9)
Diseased tubers (%) 2.5 a 26.5 b 2.2 a
LGR tuber (mm/ day) Karakter Mondial RemarkaIb 2.2 4.2 3.4Ia 1.7 4.9 3.8IIa 5.1 5.6 4.4
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Field experiment set up 2005 & 20064 isolate blocks containing:
3 cultivars3 replicates3 Sampling times
Mixed inoculum
IIA isolate
10 meter
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IA isolate
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Field experiments, foliar epidemics
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Karakter
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Remarka
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Mondial
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Genotype dynamics on “Karakter”2005 Karakter 2006
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Genotype dynamics on “Remarka”2005 Remarka 2006
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2005 Mondial 2006
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Genotype dynamics on “Mondial”
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Conclusions
Laboratory experimentsAggressiveness to foliage (composite parameters R0 & r)
• Karakter Ia > IIa >> Ib• Remarka IIa ≥ Ia, Ib non compatible• Mondial Ia ≥ IIa = Ib
Aggressiveness to tubers• IEtuber: Cultivar effect Mondial >> Karakter = Remarka• LGRtuber: Cultivar * Isolate interaction:
– Karakter IIa >> Ia > Ib– Remarka IIa > Ia > Ib– Mondial IIa > Ia > Ib
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Conclusions
Field experimentsFoliar epidemic
• Establishment– Karakter IIa > Ia >> Ib (almost incompatible)– Remarka IIa > Ia >> Ib (almost incompatible)– Mondial IIa = Ia > Ib
• Epidemic progress – Karakter Ia > IIa >> Ib– Remarka Ia > IIa >> Ib– Mondial Ia > IIa > Ib
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Conclusions
Field experimentsTransition to tubers
• Karakter Ia > IIa >> Ib• Remarka Ia > IIa >> Ib• Mondial Ia > IIa >> Ib
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Conclusions
Field experiments (General)IIa better in establishmentIa better in competing for limited spaceIa better in transition to tubers
Overall: Ia isolate better position to survive summer AND winter on all three cultivars
Transition from tuber to foliage not included in experiments
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Conclusions
Comparison Lab & Field experiments:Foliage
• Single parameters lab. Exp.’s do not predict competitive outcome (IE difficult and not reliable for establishment)
• Composite parameters better predictors (epidemic progress)
Tubers• IEtuber and LGRtuber not good predictors of tuber population
Success in foliage is large part of success in tubers !
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Overall ConclusionsLimited set of cultivars and isolates!
No trade off between aggressiveness to foliage and aggressiveness to tubers, aggressiveness pays off!
within this set of cultivars and isolateswithout the influence of modern storage regimes
Establishment, multiplication and transition to tubers key processesPopulation dynamics in foliage strongly linked to population population (dynamics) in tubers
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Thank you for your attention
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