Evolution of Sibling Fungal Plant Pathogens in Relation to Host Specialization

Gudelj, Ivana; Fitt, Bruce D.L.; Bosch, Frank van den

doi:10.1094/phyto.2004.94.7.789

Cited by 32 publications

(32 citation statements)

References 41 publications

(33 reference statements)

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“…This is somewhat simplistic because experimental studies demonstrate that the offspring of a plant pathogen can sometimes be phenotypically very different from its parent (global mutations). However, the results of computer simulations (Gudelj et al 2004) show that the evolutionary outcomes do not qualitatively change when both global and local mutations are taken into account. Global mutations are expected to influence the outcome only in the sigmoidal (steep convex-concave) case where the following is anticipated.…”

Section: Discussionmentioning

confidence: 99%

“…Examples of such pathogen groups can be found within the Botrytis genus (Holliday 1989) where B. cinerea is a generalist whereas B. fabae is a specialist. It is important to note, however, that without the analytical advantages of the adaptive dynamics which clearly identify the importance of the trade-off shape, the computational study in Gudelj et al (2004) lacks generality.…”

Section: Discussionmentioning

confidence: 99%

“…In this case an initially monomorphic pathogen population will stay monomorphic, evolving until the transmission on host 1 reaches x Ã . This outcome is illustrated in figure 3a using numerical simulations described in Gudelj et al (2004). convex) the singular point x Ã is not an ESS, is not convergence stable and therefore acts as an evolutionary repeller (figure 2c).…”

Section: Model Outcomesmentioning

confidence: 95%

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Transmission rates and adaptive evolution of pathogens in sympatric heterogeneous plant populations

Gudelj

Bosch

Gilligan

2004

Proc. R. Soc. Lond. B

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Diversification in agricultural cropping patterns is widely practised to delay the build-up of virulent races that can overcome host resistance in pathogen populations. This can lead to balanced polymorphism, but the long-term consequences of this strategy for the evolution of crop pathogen populations are still unclear. The widespread occurrence of sibling species and reproductively isolated sub-species among fungal and oomycete plant pathogens suggests that evolutionary divergence is common. This paper develops a mathematical model of host-pathogen interactions using a simple framework of two hosts to analyse the influences of sympatric host heterogeneity on the long-term evolutionary behaviour of plant pathogens. Using adaptive dynamics, which assumes that sequential mutations induce small changes in pathogen fitness, we show that evolutionary outcomes strongly depend on the shape of the trade-off curve between pathogen transmission on sympatric hosts. In particular, we determine the conditions under which the evolutionary branching of a monomorphic into a dimorphic population occurs, as well as the conditions that lead to the evolution of specialist (single host range) or generalist (multiple host range) pathogen populations.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Model Outcomesmentioning

confidence: 95%

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Transmission rates and adaptive evolution of pathogens in sympatric heterogeneous plant populations

Gudelj

Bosch

Gilligan

2004

Proc. R. Soc. Lond. B

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“…The disease is caused by a complex of Leptosphaeria species (Mendes-Pereira et al, 2003), the most important of which is L. maculans, associated with damaging stem base canker in many countries . In Europe and North America, L. maculans often co-exists with L. biglobosa (West et al, 2002a), which may have evolved from a common ancestor (Gudelj et al, 2004). Leptosphaeria biglobosa is associated with upper stem lesions; whilst generally not damaging, they can cause serious losses in countries like Poland with high summer temperatures (Huang et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

World-Wide Importance of Phoma Stem Canker (Leptosphaeria maculans and L. biglobosa) on Oilseed Rape (Brassica napus)

Brun²,

et al. 2006

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Phoma stem canker is an internationally important disease of oilseed rape (Brassica napus, canola, rapeseed), causing serious losses in Europe, Australia and North America. UK losses of e56M per season are estimated using national disease survey data and a yield loss formula. Phoma stem canker pathogen populations comprise two main species, Leptosphaeria maculans, associated with damaging stem base cankers, and Leptosphaeria biglobosa, often associated with less damaging upper stem lesions. Both major gene and quantitative trait loci mediated resistance to L. maculans have been identified in B. napus, but little is known about resistance to L. biglobosa. Leptosphaeria maculans, which has spread into areas in North America and eastern Europe where only L. biglobosa was previously identified, now poses a threat to large areas of oilseed rape production in Asia. Epidemics are initiated by air-borne ascospores; major gene resistance to initial infection by L. maculans operates in the leaf lamina of B. napus. It is not clear whether the quantitative trait loci involved in the resistance to the pathogen that can be assessed only at the end of the season operate in the leaf petioles or stems. In countries where serious phoma stem canker epidemics occur, a minimum standard for resistance to L. maculans is included in national systems for registration of cultivars. This review provides a background to a series of papers on improving strategies for managing B. napus resistance to L. maculans, which is a model system for studying genetic interactions between hemibiotrophic pathogens and their hosts.

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“…(For an introduction to concepts, ideas, and methods developed by the authors of Metz et al [1992Metz et al [ , 1996, Dieckmann and Law [1996], Geritz et al [1998], and others, see Diekmann [2004].) 5 E-mail: fhamelin@agrocampus-ouest.fr plant parasites, Gudelj et al (2004a, b) showed that evolutionary branching can occur, provided there is a (convex) trade-off between parasite transmission capacities on distinct host types. Regarding Manuscript received 23 December 2010; revised 6 May 2011; accepted 1 July 2011.…”

Section: Introductionmentioning

confidence: 99%

Seasonality and the evolutionary divergence of plant parasites

Hamelin

Castel

Poggi

et al. 2011

Ecology

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The coexistence of closely related plant parasites is widespread. Yet, understanding the ecological determinants of evolutionary divergence in plant parasites remains an issue. Niche differentiation through resource specialization has been widely researched, but it hardly explains the coexistence of parasites exploiting the same host plant. Time-partitioning has so far received less attention, although in temperate climates, parasites may specialize on either the early or the late season. Accordingly, we investigated whether seasonality can also promote phenotypic divergence. For plant parasites, seasonality generally engenders periodic host absence. To account for abrupt seasonal events, we made use of an epidemic model that combines continuous and discrete dynamics. Based on the assumption of a trade-off between in-season transmission and inter-season survival, we found through an "evolutionary invasion analysis" that evolutionary divergence of the parasite phenotype can occur. Since such a trade-off has been reported, this study provides further ecological bases for the coexistence of closely related plant parasites. Moreover, this study provides original insights into the coexistence of sibling plant pathogens which perform either a single or several infection cycles within a season (mono- and polycyclic diseases, or uni- and multivoltine life cycles).

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Evolution of Sibling Fungal Plant Pathogens in Relation to Host Specialization

Cited by 32 publications

References 41 publications

Transmission rates and adaptive evolution of pathogens in sympatric heterogeneous plant populations

Transmission rates and adaptive evolution of pathogens in sympatric heterogeneous plant populations

World-Wide Importance of Phoma Stem Canker (Leptosphaeria maculans and L. biglobosa) on Oilseed Rape (Brassica napus)

Seasonality and the evolutionary divergence of plant parasites

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