Physiological Races of Colletotrichum graminicola on Sorghum

Ali, Misbah; Warren, H. L.

doi:10.1094/pd-71-0402

Cited by 58 publications

(37 citation statements)

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“…These interactions were most clearly evident for root infections, but could also be detected for symptoms on stolons and tubers when the disease was sufficiently established. This specificity suggests that physiological races, similar to those existing in other Colletotrichum species such as C. lindemuthianum (Tu, 1992) or C. graminicola (Ali & Warren, 1987), may also exist within C. coccodes. Nothing is known about the inheritance of black dot reaction in potato, but quantitative resistance with partial dominance has been shown to exist in tomato (Barksdale, 1971(Barksdale, , 1972Miller et al, 1984).…”

Section: Discussionmentioning

confidence: 81%

Colonization of roots, stolons, tubers and stems of various potato (Solanum tuberosum) cultivars by the black‐dot fungus Colletotrichum coccodes

Andrivon¹,

Lucas²,

Guérin³

et al. 1998

Plant Pathology

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In an attempt to better understand the importance of tuber-borne inoculum in black dot development, several potato cultivars were inoculated with various Colletotrichum coccodes isolates. Symptoms developed first on underground organs (starting 2 weeks after inoculation on roots, and later on stolons and tubers) of inoculated plants; stem infections developed only after 7-10 weeks, depending on the cultivar. Infection with C. coccodes resulted in a reduction in numbers of stolons and tubers in cv. Bintje, but not in the later maturing cv. Roseval. Significant isolate by cultivar interactions were detected from the analysis of root symptoms after inoculation of three potato cultivars (Bintje, Spunta and Desiree) with five C. coccodes isolates. Such an interaction was also detected for stolon/tuber symptoms at the latest scoring date (98 days after inoculation), but not at earlier dates (58, 70 and 84 days after inoculation). These results suggest that protocols based on root colonization might be used for investigating cultivar response to black dot and pathogenicity of C. coccodes isolates, and that some specificity exists in the reaction of potato genotypes to this pathogenic fungus.

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Section: Discussionmentioning

confidence: 81%

Colonization of roots, stolons, tubers and stems of various potato (Solanum tuberosum) cultivars by the black‐dot fungus Colletotrichum coccodes

Andrivon¹,

Lucas²,

Guérin³

et al. 1998

Plant Pathology

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“…Henn., Kabát & Bubák, is one of the most destructive foliar diseases and, presently, it is found in most sorghum growing regions [1][2][3][4][5]. The pathogen infects all above-ground parts of the plants with infection of leaves more commonly observed as compared to infection of the stalks and panicles.…”

Section: Introductionmentioning

confidence: 99%

“…Yield loss is primarily due reduction in grain number and size [5]. The occurrence of different pathotypes and levels of pathogenicity within the pathogen population require the identification of additional sources of resistance [1][2][3]7]. Thus, the objectives of this study were to evaluate subsets of sorghum accessions collected from four African countries to identify new sources of anthracnose resistance and to determine if…”

Section: Introductionmentioning

confidence: 99%

Response of Sorghum Accessions from Four African Countries against <i>Colletotrichum sublineolum</i>, Causal Agent of Sorghum Anthracnose

Prom¹,

Erpelding²,

Perumal³

et al. 2012

AJPS

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Seventy-two sorghum accessions were randomly selected from the Ethiopia, Mali, Sudan, and Uganda germplasm collections maintained by the US National Plant Germplasm System to evaluate variation in anthracnose resistance. The accessions were planted in a randomized complete block design in College Station, Texas during the 2007 and 2008 growing seasons. Twenty-six accessions exhibited a resistant response across growing seasons with 8 accessions showing a susceptible response. Twenty-nine accessions showed variation in disease response within and between experiments. Seven accessions were rated as resistant in 2007 but showed a susceptible reaction in 2008. The frequency of resistant germplasm varied based on country of origin with 80% of the accessions from Mali, 48% of the accessions from Uganda, 24% of the accessions from Sudan, and 7% of the accessions from Ethiopia exhibiting a resistance response. When the same accessions were evaluated in Isabela, Puerto Rico, 100% of the accessions from Mali, 43% of the accessions from Uganda, and 28% of the accessions from Sudan exhibited a resistant response. All the accessions from Ethiopia were susceptible to anthracnose when evaluated in Isabela, Puerto Rico. In both locations, 22 accessions exhibited a resistant response. Four accessions rated as resistant in Texas were found to be susceptible in Puerto Rico; whereas, five accessions rated as resistant in Puerto Rico showed a susceptible response in Texas. These results indicated that the Mali, Sudan, and Uganda sorghum collections may be an important source of anthracnose resistance. However, the identification of anthracnose resistant germplasm from many diverse regions could result in the identification of new sources of genetic variation for resistance. Also, greater genetic variation for resistance could be present in regions with a high frequency of resistant germplasm.

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“…In nature, the fungus occurs in the mitosporic form and can survive as mycelium, conidia and/or sclerotia in crop debris and infected seed (Casela & Ferreira, 1998). Genetic resistance has been the main strategy for the control of this disease, but host-specific resistance is often unstable because of the high variability in the pathogen population (Ali & Warren, 1987;Casela & Ferreira, 1995;Bressan & Figueiredo, 2003).…”

Section: Introductionmentioning

confidence: 99%

Morphogenetic characterization of Colletotrichum sublineolum strains, causal agent of anthracnose of Sorghum

Zanette¹,

Nobrega²,

Paccola-Meirelles³

2009

Trop. plant pathol.

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Anthracnose, caused by Colletotrichum sublineolum, has been one of the most destructive diseases affecting sorghum crops in Brazil. This study aimed to characterize wild and mutant strains through morphological and cultural characteristics, conidiation, and mating-type. A high variability was observed among strains when evaluated through radial growth and type of conidia produced. Spontaneous release of sectors by some strains was also observed, confirming the high genetic instability of this pathogen. Mating type genes amplified through PCRs using the primers, SKCM1, NcHMG and HGMgram demonstrated that both idiomorphs are present in this species. All the strains analyzed were self-sterile. It was not possible to correlate the auxotrophic mutant phenotype with the morphological characteristics evaluated. Keywords: conidial dimorphism, sexual cycle, mating type. RESUMO Caracterização morfogenética de linhagens de Colletotrichum sublineolum, agente causal da antracnose do sorgoA antracnose, causada por Colletotrichum sublineolum tem sido uma das mais destrutivas doenças que afetam a cultura do sorgo no Brasil. Este estudo teve como objetivo caracterizar linhagens selvagens e mutantes em relação à morfologia, produção de conídios e mating type. Uma alta variabilidade entre as linhagens foi observada em relação ao crescimento radial e produção de conídios ovais e falcados. Setores foram liberados espontaneamente por algumas linhagens, o que confirma a alta instabilidade genética deste patógeno. Genes ligados a característica mating type foram amplificados por PCRs utilizando os primers SKCM1, NcHMG e HGMgram, demonstrando que ambos os idiomorfos estão presentes nesta espécie. Todas as linhagens estudadas foram auto-estéreis. Não foi possível detectar correlação entre o fenótipo auxotrófico mutante e as características morfológicas avaliadas. Palavras-chave: dimorfismo conidial, ciclo sexual, mating type.

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Physiological Races of Colletotrichum graminicola on Sorghum

Cited by 58 publications

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Colonization of roots, stolons, tubers and stems of various potato (Solanum tuberosum) cultivars by the black‐dot fungus Colletotrichum coccodes

Colonization of roots, stolons, tubers and stems of various potato (Solanum tuberosum) cultivars by the black‐dot fungus Colletotrichum coccodes

Response of Sorghum Accessions from Four African Countries against <i>Colletotrichum sublineolum</i>, Causal Agent of Sorghum Anthracnose

Morphogenetic characterization of Colletotrichum sublineolum strains, causal agent of anthracnose of Sorghum

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Physiological Races of Colletotrichum graminicola on Sorghum

Cited by 58 publications

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Colonization of roots, stolons, tubers and stems of various potato (Solanum tuberosum) cultivars by the black‐dot fungus Colletotrichum coccodes

Colonization of roots, stolons, tubers and stems of various potato (Solanum tuberosum) cultivars by the black‐dot fungus Colletotrichum coccodes

Response of Sorghum Accessions from Four African Countries against &lt;i&gt;Colletotrichum sublineolum&lt;/i&gt;, Causal Agent of Sorghum Anthracnose

Morphogenetic characterization of Colletotrichum sublineolum strains, causal agent of anthracnose of Sorghum

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Response of Sorghum Accessions from Four African Countries against <i>Colletotrichum sublineolum</i>, Causal Agent of Sorghum Anthracnose