Local origin of two vegetative compatibility groups of<i>Fusarium oxysporum</i>f. sp.<i>vasinfectum</i>in Australia

Wang, Bo; Brubaker, Curt L.; Summerell, Brett A.; Thrall, Peter H.; Burdon, Jeremy J.

doi:10.1111/j.1752-4571.2010.00139.x

Cited by 38 publications

(28 citation statements)

References 61 publications

(83 reference statements)

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“…For instance, two clonal lineages of Fusarium oxysporum f. sp. vasinfectum , infecting cotton ( Gossypium hirsutum L.) crops in Australia, were found to originate from local wild cotton areas (Wang et al ., ). Here, our study shows that resistance traits introduced from wild relatives can act as a gateway for the agrosystem, facilitating the introduction of pathogen populations carrying new alleles with detrimental effects on agricultural production.…”

Section: Discussionmentioning

confidence: 97%

Emergence of new virulent populations of apple scab from nonagricultural disease reservoirs

et al. 2015

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SummaryPlant pathogens adapt readily to new crop varieties in agrosystems, and it is crucial to understand the factors underlying the epidemic spread of new virulent strains if we are to develop more efficient strategies to control them.In this study we used multilocus microsatellite typing, molecular epidemiology tools and a large collection of isolates from cultivated, wild and ornamental apples to investigate the origin of new virulent populations of Venturia inaequalis, an ascomycete fungus causing apple scab on varieties carrying the Rvi6 resistance gene.We demonstrated a common origin at the European scale of populations infecting apples (Malus 9 domestica) carrying the Rvi6 resistance and Malus floribunda, the progenitor of the Rvi6 resistance. Demographic modeling indicated that the Rvi6-virulent lineage separated several thousands of years ago from populations infecting non-Rvi6 hosts, without detectable gene flow between the two lineages.These findings show that 'breakdowns' of plant resistance genes can be caused by the selection and migration of virulent genotypes from standing genetic variation maintained in environmental disease reservoirs, here ornamental crabapples. This work stresses the need to take better account of pathogen diversity in resistance screenings of breeding lines and in resistance deployment strategies, in order to enhance sustainable disease management.

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Section: Discussionmentioning

confidence: 97%

Emergence of new virulent populations of apple scab from nonagricultural disease reservoirs

et al. 2015

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“…) including: emergence of pathogens from native flora (Wang et al. ; van der Merwe et al. ), use of sources of resistance from wild hosts (Garry et al.…”

Section: Introductionmentioning

confidence: 99%

Crop pathogen emergence and evolution in agro‐ecological landscapes

Papaïx

Burdon

Zhan

et al. 2015

Evolutionary Applications

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Remnant areas hosting natural vegetation in agricultural landscapes can impact the disease epidemiology and evolutionary dynamics of crop pathogens. However, the potential consequences for crop diseases of the composition, the spatial configuration and the persistence time of the agro-ecological interface – the area where crops and remnant vegetation are in contact – have been poorly studied. Here, we develop a demographic–genetic simulation model to study how the spatial and temporal distribution of remnant wild vegetation patches embedded in an agricultural landscape can drive the emergence of a crop pathogen and its subsequent specialization on the crop host. We found that landscape structures that promoted larger pathogen populations on the wild host facilitated the emergence of a crop pathogen, but such landscape structures also reduced the potential for the pathogen population to adapt to the crop. In addition, the evolutionary trajectory of the pathogen population was determined by interactions between the factors describing the landscape structure and those describing the pathogen life histories. Our study contributes to a better understanding of how the shift of land-use patterns in agricultural landscapes might influence crop diseases to provide predictive tools to evaluate management practices.

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“…Australian Fov consists of two distinct clonal lineages belonging to VCGs 01111 and 01112 that differ from all others found elsewhere, and phylogenetic analyses show that they have evolved from a lineage of indigenous F. oxysporum (Davis et al 1996;Kim et al 2005;Wang et al 2006;2010). There is evidence suggesting that considerable changes in genetic structure may have occurred in the Australian Fov population over the past decade as many previously widespread, dominant Fov genotypes have not been found in recent collections (B. Wang, unpublished data).…”

Section: Introductionmentioning

confidence: 92%

Host resistance mediated inter-genotype competition and temporal variation in Fusarium oxysporum f. sp. vasinfectum

et al. 2010

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Temporal variation in Fusarium oxysporum f. sp. vasinfectum (Fov) populations was determined by comparing the genetic diversity of pathogen isolates recovered from three consecutive cotton crops (2002, 2004 and 2006) in the Boggabilla area of New South Wales, Australia. A total of 288 isolates were collected, among which 25 distinct AFLP genotypes were identified. These genotypes were classified into two main groups corresponding to known vegetative compatibility groups (VCG)-01111 and 01112. The Fov populations were dominated by four genotypes (I-A, I-B, II-A, II-B) that accounted for 87.5% of the isolates. Significant temporal variation was observed in both sampled fields with 6.8% and 10.7% of total genetic variation being attributed to differences among collections in different years. Genetic diversity based on Nei's gene diversity and the Shannon-Wiener index increased over time. Significant changes in the frequency of the dominant Fov genotypes were observed in one field, where genotype I-A declined from 84.8% to 40.0% over the study period (2002)(2003)(2004)(2005)(2006), while genotype I-B increased from 7.6% to 35.4%. Strong inter-genotype competition was detected in glasshouse bioassays with 93.4% of symptomatic plants sampled from dual inoculation trials being infected by single genotypes. Competition was differentially mediated by cotton cultivars as the competitive ability of pathogen genotype I-B was enhanced on the resistant cultivar Sicot 189 relative to the susceptible cultivar Siokra 1-4. This suggests that host-mediated inter-genotype competition may play an important role in temporal variation in Fov populations in the field.

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Local origin of two vegetative compatibility groups ofFusarium oxysporumf. sp.vasinfectumin Australia

Cited by 38 publications

References 61 publications

Emergence of new virulent populations of apple scab from nonagricultural disease reservoirs

Emergence of new virulent populations of apple scab from nonagricultural disease reservoirs

Crop pathogen emergence and evolution in agro‐ecological landscapes

Host resistance mediated inter-genotype competition and temporal variation in Fusarium oxysporum f. sp. vasinfectum

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