Variation in pathogen aggressiveness within a metapopulation of the <i>Cakile maritima</i>–<i>Alternaria brassicicola</i> host–pathogen association

Thrall, Peter H.; Barrett, Luke G.; Burdon, Jeremy J.; Alexander, Helen M.

doi:10.1111/j.1365-3059.2005.01190.x

Cited by 40 publications

(31 citation statements)

References 36 publications

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“…Pusz (2009) found colony diameter ranging from 4.8 to 6.8 cm while working with A. alternata. Similar observations were also recorded by Thrall et al (2005) and Rai and Kumari (2009).…”

Section: Discussionsupporting

confidence: 77%

Cultural, Morphological and Pathogenic Characterization of Alternaria porri Causing Purple Blotch of Onion

Mohsin

Islam

Ahmmed

et al. 2016

Not Bot Horti Agrobo

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Twenty seven (27) isolates of Alternaria porri were isolated from diseased leaf samples collected from different onion growing regions of Bangladesh and characterized for cultural, morphological and pathogenic variabilities. A. porri colonies colony colour ranged between light to dark olivacious and grayish white with irregular, regular with concentric ring and regular without concentric ring shape. Margin of colonies were entire, irregular and wavy with effuse, fluffy and velvety texture. Isolates impregnated media with colour ranged between grey to brown on the reverse of the plates. Growth rate of isolates ranged between 2.433 and 3.950 mm/day with fast growth in isolate DSTR 02 and least in MMBH. Morphological variation in conidia production was between 7.720×10 3 to 47.02×10 3 per mm 2 with sporulation time 3.33 to 11.00 days. The conidial shape was straight to curve with light to deep brown colour. The number of horizontal and vertical separation in the conidia ranged from 3.00 to 6.00 × 1.00 to 2.00 with size from 11.20 to 39.20 × 4.76 to 11.43 µm. In pathogenicity test isolates also exhibited variations in size of the lesions (2.77 to 7.55 mm) produced on onion leaves. The results demonstrate existence of considerable variation in cultural, morphological, and pathogenic characters of A. porri isolates prevalent in Bangladesh environment.

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“…Pusz (2009) found colony diameter ranging from 4.8 to 6.8 cm while working with A. alternata. Similar observations were also recorded by Thrall et al (2005) and Rai and Kumari (2009).…”

Section: Discussionsupporting

confidence: 77%

Cultural, Morphological and Pathogenic Characterization of Alternaria porri Causing Purple Blotch of Onion

Mohsin

Islam

Ahmmed

et al. 2016

Not Bot Horti Agrobo

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“…The mean minimum lesion size of 2.9 mm was observed in Am-17 and maximum of 10.2 mm was seen in Am-1. The findings are in agreement with Thrall et al (2005) who reported significant variations in the lesion size produced by Alternaria brassicicola isolates on wound inoculated Cakile maritima plants. Kumar (2004) also reported variation in lesion size and lesion number in Alternaria triticina isolates.…”

Section: Pathogenic Variabilitysupporting

confidence: 82%

“…Almost similar observations were recorded by Pusz (2009) on A. alternata with colony diameter ranging from 4.8 to 6.8 cm among 26 isolates after seven days of inoculation. Similar observations were also recorded by Thrall et al (2005) and Rai and Kumari (2009 …”

Section: Cultural Variabilitysupporting

confidence: 77%

Cultural, morphological, pathogenic and molecular characterization of Alternaria mali associated with Alternaria leaf blotch of apple

T¹,

Muzafer²,

Gh³

et al. 2013

Afr. J. Biotechnol.

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“…The sites chosen for this study represent a subset of populations that form part of ongoing work on the metapopulation dynamics of the Cakile-Alternaria interaction (60,61). The collection, isolation, and maintenance of isolates were as described previously (60). Infected plants were sampled randomly within populations.…”

Section: Methodsmentioning

confidence: 99%

Expansion of Genetic Diversity in Randomly Mating Founder Populations ofAlternaria brassicicolaInfectingCakile maritimain Australia

Linde

Liles

Thrall

2010

Appl Environ Microbiol

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Founder populations of fungal plant pathogens are expected to have low levels of genetic diversity coupled with further genetic drift due to, e.g., limited host availability, which should result in additional population bottlenecks. This study used microsatellite markers in the interaction between Cakile maritima and the fungal pathogen Alternaria brassicicola to explore genetic expectations associated with such situations. The host, C. maritima, was introduced into Australia approximately 100 years ago, but it is unknown whether the pathogen was already present in Australia, as it has a wide occurrence, or whether it was introduced to Australia on brassicaceous hosts. Eleven A. brassicicola populations were studied, and all showed moderate levels of gene and genotypic diversity. Chi-square tests of the frequencies of mating type alleles, a large number of genotypes, and linkage equilibrium among microsatellite loci all suggest A. brassicicola reproduces sexually. Significant genetic differentiation was found among populations, but there was no evidence for isolation by distance effects. Bayesian analyses identified eight clusters where the inferred clusters did not represent geographical populations but instead consisted of individuals admixed from all populations. Further analysis indicated that fungal populations were more likely to have experienced a recent population expansion than a population bottleneck. It is suggested that A. brassicicola has been introduced into Australia multiple times, potentially increasing the diversity and size of any A. brassicola populations already present there. Combined with its ability to reproduce sexually, such processes appear to have increased the evolutionary potential of the pathogen through recent population expansions.

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Variation in pathogen aggressiveness within a metapopulation of the Cakile maritima–Alternaria brassicicola host–pathogen association

Cited by 40 publications

References 36 publications

Cultural, Morphological and Pathogenic Characterization of Alternaria porri Causing Purple Blotch of Onion

Cultural, Morphological and Pathogenic Characterization of Alternaria porri Causing Purple Blotch of Onion

Cultural, morphological, pathogenic and molecular characterization of Alternaria mali associated with Alternaria leaf blotch of apple

Expansion of Genetic Diversity in Randomly Mating Founder Populations ofAlternaria brassicicolaInfectingCakile maritimain Australia

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