The principles of scaling and the inheritance of resistance to coffee berry disease in Coffea arabica

Graaff, N. A. van der

doi:10.1007/bf00039212

Cited by 11 publications

(7 citation statements)

References 2 publications

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“…The hypocotyls‐inoculation method has been used satisfactorily to select for CBD resistance, although there have been different opinions on scaling and data analysis (Van der Vossen et al ., 1976; Van der Graaff, 1978, 1982; Dancer, 1986; Owour & Agwanda, 1990). In this study, a cut‐off between presence and absence of resistance was made at class 10, based on the infection reaction of the susceptible control (cv.…”

Section: Discussionmentioning

confidence: 99%

Identification of molecular markers linked to a gene conferring resistance to coffee berry disease (Colletotrichum kahawae) in Coffea arabica

et al. 2008

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Coffee berry disease (CBD) caused by Colletotrichum kahawae is a major constraint to Arabica coffee ( Coffea arabica ) production in Africa. One source of resistance to the disease is a natural interspecific hybrid between C. arabica and C. canephora and its derivatives. This study is aimed at deciphering the genetic basis of the host resistance and identification of molecular markers associated with it. CBD is a mature stage disease and in the absence of a mature mapping population, early detection of disease reaction phenotypes of mapping individuals is required. Two F 2 populations from crosses of cv. Catimor (resistant) and cv. SL28 (susceptible) were screened for resistance by a two step procedure. First, half of each population was screened 6 weeks after germination by inoculating hypocotyls with the pathogen. The surviving seedlings (G1) were considered to be resistant and were raised in a nursery together with the other unscreened halves (G2). Secondly, after one year, all the seedlings (G1 + G2) were screened by inoculation. Analysis of 57 microsatellites and 31 AFLP markers in 56 and 95 seedlings from G1 and G2, respectively, were performed. Eight AFLP and two microsatellites markers linked tightly to the resistant phenotype were identified and mapped to one unique chromosomal fragment introgressed from C. canephora . The gene conferring the resistance was localized within an 11 cM segment. It is concluded that the locus carries a major resistance gene designated Ck -1, which is likely to be synonymous to the T gene described in previous studies.

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Section: Discussionmentioning

confidence: 99%

Identification of molecular markers linked to a gene conferring resistance to coffee berry disease (Colletotrichum kahawae) in Coffea arabica

et al. 2008

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“…Thereafter, inoculated coffee hypocotyls were incubated for three weeks at 19-20°C. Hypocotyls were individually scored for CBD symptom development using a scale of 0-4 (0 = absence of symptoms, 1 = one or two small brownish chlorotic lesions, 2 = coalescence brownish lesions, 3 = abundant black lesions, 4 = dead hypocotyls), developed by Van der Graaff [31]. The scoring days were at 7, 14 and 21 days at Lyamungu, Moshi, Tanzania and 3, 6, 9, 12, 15, 18 and 21 days at CIFC, Portugal.…”

Section: Evaluation Of 16 Coffee Lines For Resistance To Colletotrichum Kahawae Strainsmentioning

confidence: 99%

NATURE OF RESISTANCE OF LYAMUNGU HYBRIDS TO Colletotrichum kahawae STRAINS

DL¹,

SILVA²,

RB³

et al. 2013

Int J of Biot Appl

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Nature of resistance of Lyamungu coffee hybrids to coffee berry disease (CBD) caused by Colletotrichum kahawae were evaluated using conidia germination on cuticular wax extracted from the hybrids, stimulatory effects on the infection of the pathogen, and evidence of genetic resistance on studies using hypocotyls and green berries in the field. Significant differences (P £ 0.05) were found between the levels of conidia germination on the extracted wax of the coffee genotypes. Nine coffee genotypes showed no conidia germination and five showed conidia germination percentage of below 20%. Conidial germination percentage levels of up to 90% were found on CBD susceptible variety N39. Light micrographs showed that hyphal growth of C. kahawae strains were restricted in epidermal cells and cortex of CBD resistant genotypes 20498 and 20509. Callose and thick walls were observed in cortex cells of resistant genotypes 20498 and 20509. Field evaluation also revealed same genotypes which exhibit highest levels of CBD resistance. In order to understand resistance of Lyamungu coffee hybrids, pathogenicity of 26 C. kahawae strains from different eco-agricultural zone in Tanzania was studied under laboratory conditions. Pathogenicity tests both on detached green coffee berries and hypocotyls drew a distinction between highly and less pathogenic strains. The C. kahawae strain 2006/14 was found to be the most pathogenic because it showed high sporulation capacity and also induces CBD symptoms 3 days after infection both on green coffee berries and hypocotyls.

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“…En Éthiopie, où la maladie n'a été signalée qu'en 1970, des différences de niveau d'attaque ont été observées dans les populations de caféiers sauvages et les variétés cultivées (ROBINSON, 1974; VAN DER GRAAF, 1981). Au Cameroun, les observations au champ ont permis de déceler des caféiers présentant différents niveaux de résistance dans des collections constituées notamment d'introductions de matériel originaire d'Ethiopie.…”

Section: L'anthracnose Des Baies Du Caféier Arabicaunclassified

“…Compte tenu de la nature supposée oligogénique de cette résistance, l'étude de sa spécificité envers le pathogène est actuellement une priorité pour les programmes de recherche en cours sur cette maladie. Si quelques travaux font état de la possible existence de races chez Col/etotrichum kahawae (RoDRIGUES etal., 1992), les études réalisées dans le cadre d'un projet européen sur la résistance à l'anthracnose des baies tendent à montrer la présence d'une résistance de type quantitatif et non spécifique; une grande variabilité de l'agressivité des isolats testés est toutefois systématiquement observée (BELLA MANGA etal., 1997).En Éthiopie, zone de diversification de l'espèce Arabica, l'apparition de la maladie a permis de mettre en évidence différents niveaux d'attaque dans des populations sauvages de C. arabica VAN DER GRAAF (1981. a montré que…”

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Les maladies des cultures pérennes tropicales

1999

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Nous remercions Monsieur M. ORON, professeur de phytopathologie et directeur scientifique du Cirad, d'avoir accepté de préfacer ce travail. Messieurs R.-A. MULLER et E. LAVILLE, directeurs scientifiques honoraires des anciens instituts lrcc et lrfa, ont accepté de relire ce travail. Leurs grandes connaissances, notamment dans le domaine de la pathologie des plantes étudiées par ces instituts, ont constitué un apport très important à cet ouvrage. Qu'ils trouvent ici notre grande reconnaissance. Messieurs J. MEUNIER, directeur scientifique adjoint du Cirad, après une longue carrière à l'lrho, et J.-C. FOLLIN, phytopathologiste au Cirad, ont bien voulu relire le manuscrit. Leurs avis nous ont été très précieux, qu'ils en soient vivement remerciés. Nous remercions également madame M.-L. CARUANA et messieurs M. GRISONI, M. ÜELABARRE, O. PRUVOST, J.-M. THÉVENIN et TRAN VAN CANH pour leur contribution.Nous avons bénéficié de la compétence du service des éditions du Cirad pour le travail éditorial et pour la mise en page. Compte tenu de l'importance que revêtent ces opérations, qu'il en soit grandement remercié.

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The principles of scaling and the inheritance of resistance to coffee berry disease in Coffea arabica

Cited by 11 publications

References 2 publications

Identification of molecular markers linked to a gene conferring resistance to coffee berry disease (Colletotrichum kahawae) in Coffea arabica

Identification of molecular markers linked to a gene conferring resistance to coffee berry disease (Colletotrichum kahawae) in Coffea arabica

NATURE OF RESISTANCE OF LYAMUNGU HYBRIDS TO Colletotrichum kahawae STRAINS

Les maladies des cultures pérennes tropicales

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