Variabilidade patogênica de Phaeoisariopsis griseola na Costa Rica

C., Steffany Orozco; F., Carlos Manuel Araya

doi:10.1590/s0100-41582005000600004

Cited by 4 publications

(7 citation statements)

References 9 publications

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“…Isolates had different patterns of virulence when inoculated on 12 differential cultivars of P. griseola, and were classified into 10 pathotypes (Table 2). These results confirm the high variability of P. griseola and are in agreement with studies conducted elsewhere (Mahuku et al., 2002a; Nietsche et al., 2002; Sartorato, 2002, 2004; Orozco and Araya, 2005).…”

Section: Resultssupporting

confidence: 93%

“…Nietsche et al. (2002) and Orozco and Araya (2005) observed wide pathogenic variability among the isolates of P. griseola , and identified a different pathotype for each of the three isolates studied. Similar results were reported by Mahuku et al.…”

Section: Resultsmentioning

confidence: 94%

“…(2002) detected high variability, totalling 26 different pathotypes among 73 isolates. Great genetic variability was also detected in other parts of the world (Mahuku et al., 2002a; b; Pastor‐Corrales et al., 2004; Wagara et al., 2004; Orozco and Araya, 2005; Stenglein et al., 2005; Stenglein and Balatti, 2006). The occurrence of pathotype 63–63, which has a compatible reaction to all differential cultivars, was mentioned in all papers cited above, which implies in a constant search for new resistance sources.…”

Section: Introductionmentioning

confidence: 86%

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Pathogenic Variability of Isolates of Pseudocercospora griseola, the Cause of Common Bean Angular Leaf Spot, and its Implications for Resistance Breeding

Silva¹,

Souza²,

Sartorato³

et al. 2008

Journal of Phytopathology

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The pathogenic variability was evaluated of 48 Pseudocercospora griseola isolates collected in the State of Minas Gerais, Brazil. Isolates were inoculated to a set of 12 international differential cultivars in a greenhouse. Ten pathotypes (55‐15, 63‐7, 63‐15, 63‐23, 63‐25, 63‐27, 63‐31, 63‐47, 63‐55 and 63‐63) were identified, showing the great pathogenic variability of this fungus in Minas Gerais State. Pathotypes 55‐15, 63‐15, 63‐25 and 63‐27 had not previously been reported in the State. Of the 48 isolates, all except pathotype 55‐1547 induced a compatible reaction with all cultivars from the Andean group. Isolates were highly pathogenic in both Andean and Mesoamerican cultivars, thus being classified as Mesoamerican pathotypes. Pathotype 63‐63 was the most widespread, and overcame the resistance genes present in all differential cultivars.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 86%

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Pathogenic Variability of Isolates of Pseudocercospora griseola, the Cause of Common Bean Angular Leaf Spot, and its Implications for Resistance Breeding

Silva¹,

Souza²,

Sartorato³

et al. 2008

Journal of Phytopathology

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“…Similar findings have been reported by [15] and [26] who observed, on average, the occurrence of one pathotype for each two and seven isolates respectively. Studies by [15] and [27] found larger variability than those conducted by [26] probably due to the great diversity of the sampled places and to the hosts from both gene pools (Mesoamerican and Andean). This was clearly exhibited in the findings as six AEZs within western Kenya were covered.…”

Section: Discussionmentioning

confidence: 72%

Pathogenic Variability of Angular Leaf Spot Disease of Common Bean in Western Kenya

Leitich¹

2016

IJAAS

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Common bean (Phaseolus vulgaris L.) is the most important legume and is second only to maize as a food crop in Kenya. Despite its importance, bean productivity is declining in western Kenya due to several biotic and abiotic constraints including several fungal diseases. Among these diseases, angular leaf spot (Phaeoisariopsis griseola (Sacc.) is one of the most damaging and widely distributed diseases of common bean, causing yield losses as high as 80%. Furthermore, the problem is compounded by limited information on pathogen distribution and variability in western Kenya hindering breeding for angular leaf spot (ALS) resistance. Therefore, this study was carried out to characterise the ALS pathogen (Phaeoisariopsis griseola) (Sacc.) into different pathotypes. Forty-two isolates of P. griseola were collected from different bean growing areas of western Kenya and characterized into six pathotypes

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“…Chemical control carries considerable environmental and financial costs (MIKLAS et al, 2006). Due to the high genetic variability of P. griseola (BROCK, 1951;PYNDJI, 1993;PASTOR-CORRALES et al, 1998;OROZCO;ARAYA, 2005;STENGLEIN;BALATTI, 2006;SILVA, et al, 2008), genetic control through the use of resistant cultivars is very difficult.…”

Section: Angular Leaf Spot (Als) Caused Bymentioning

confidence: 99%

Antifungal activity and ultrastructural alterations in Pseudocercospora griseola treated with essential oils

et al. 2012

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Pseudocercospora griseola, the etiologic agent of angular leaf spot of common bean (Phaseolus vulgaris), is an important disease in all bean-producing regions worldwide and may cause extremely high yield losses. The control of this disease is made more difficult by the pathogen's genetic variability and the inefficiency of fungicides. In this study, of 26 essential oils tested at different concentrations, 25 demonstrated efficiency in affecting the germination of strains 63-31 and 63-63 of the pathogen, reaching inhibition levels of between 80% and 100%. Cymbopogon citratus and Cymbopogon martinii inhibited conidia germination at all concentrations; Eugenia caryophyllata, Cinnamomum sp., Thymus vulgaris, Matricaria recutita, Cordia verbenacea, Origanum vulgare, Cymbopogon nardus, at 0.1 and 0.5%; and Zingiber officinale, Mentha arvensis, Chamaecyparis pisifera, Lavandula officinalis, Ocimum basilicum, Pimpinella anisum, Ocimum selloi, Baccharis dracunculifolia, Laurus nobilis, Citrus sinensis, Melaleuca alternifolia and Eucalyptus globulus, at 0.5%. The main constituents identified were cinnamaldehyde in Cinnamomum sp.; eugenol in E. caryophyllata; trans-β-farnesene in M. recutita; pulegone in C. verbenacea; thymol in T. vulgaris; geranial and neral in C. citratus, and geraniol in C. martini. Through transmission electron microscopy (TEM), it was verified that C. citratus, C. martini and E. caryophyllata presented direct fungitoxic action on P. griseola, causing severe damage to the cellular ultrastructure of the conidia, invalidating germination. These results indicated that essential oils are a promising alternative strategy for the control of angular leaf spot in bean, representing less risk to human health and the environment.

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Variabilidade patogênica de Phaeoisariopsis griseola na Costa Rica

Cited by 4 publications

References 9 publications

Pathogenic Variability of Isolates of Pseudocercospora griseola, the Cause of Common Bean Angular Leaf Spot, and its Implications for Resistance Breeding

Pathogenic Variability of Isolates of Pseudocercospora griseola, the Cause of Common Bean Angular Leaf Spot, and its Implications for Resistance Breeding

Pathogenic Variability of Angular Leaf Spot Disease of Common Bean in Western Kenya

Antifungal activity and ultrastructural alterations in Pseudocercospora griseola treated with essential oils

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