Resistance to Black Pod Disease in a Segregating Cacao Tree Population

Bahia, Rita de Cássia; Aguilar-Vildoso, Carlos Ivan; Luz, Edna Dora Martins Newman; Lopes, Uilson Vanderlei; Machado, Regina Celle Rebouças; Corrêa, Ronan Xavier

doi:10.1007/s40858-014-0003-7

Cited by 16 publications

(10 citation statements)

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“…isolates 692 (P. capsici), 1043 (P. citrophthora), and 2196 (P. palmivora), obtained from CEPEC Phytophthora collection. Our findings differ from the results showed by Bahia et al (2015), who used the black pod isolates 62 (P. citrophthora) and 252 (P. palmivora).…”

Section: Phenotypic Evaluation Of Black Pod Diseasecontrasting

confidence: 99%

“…Campêlo et al (1982) investigated the response of 'comum' variety cacao pods to Phytophthora species infection and reported that isolates of P. citrophthora showed higher virulence, whereas P. palmivora and P. capsici isolates showed intermediate and lower virulence, respectively. The mean values of the leaf lesions caused by P. citrophthora are approximately two times higher than the mean values of the leaf lesions caused by P. palmivora in clones TSH 1188 and CCN 51 (Bahia et al, 2015). The moderate resistance of clone CCN 51 to Phytophthora spp.…”

Section: Phenotypic Evaluation Of Black Pod Diseasementioning

confidence: 74%

“…Since the study by Nyassé et al (1995) was published, the leaf-disc test applied in this study has been widely used to screen for resistance to black pod disease in cacao trees in studies conducted by Barreto et al (2015) and Bahia et al (2015). This analysis provides a rapid and early assessment of resistance levels, furthermore, a positive correlation between the data obtained by this method and the data obtained by field analyses has been observed, as well as anatomical similarities between the abaxial leaf side and the cacao pod epidermis (Nyassé et al, 1995;Tahi et al, 2006;Santos et al, 2009).…”

Section: Phenotypic Traits: Evaluation Of Black Pod Diseasementioning

confidence: 99%

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QTL mapping and identification of corresponding genomic regions for black pod disease resistance to three Phytophthora species in Theobroma cacao L.

et al. 2018

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Section: Phenotypic Evaluation Of Black Pod Diseasecontrasting

confidence: 99%

Section: Phenotypic Evaluation Of Black Pod Diseasementioning

confidence: 74%

Section: Phenotypic Traits: Evaluation Of Black Pod Diseasementioning

confidence: 99%

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QTL mapping and identification of corresponding genomic regions for black pod disease resistance to three Phytophthora species in Theobroma cacao L.

et al. 2018

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“…Search for resistant materials is a must in a breeding programme. Traditionally, for perennial crops, alternative inoculations methods are used to evaluate the material responses to the pathogen of interest followed by a field validation (Bahia et al, ; Vanhove, Vermaelen, Panis, Swennen, & Carpentier, ; Wu, Yi, & Peng, ). One of the limiting factors in the development of resistant varieties is the lack of early screening methods to adequately differentiate genotypes.…”

Section: Discussionmentioning

confidence: 99%

Response of in vitro obtained oil palm and interspecific OxG hybrids to inoculation with Phytophthora palmivora

Avila-Mendez¹,

Avila²,

Pardo³

et al. 2019

Forest Pathology

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Bud rot (BR) disease caused by Phytophthora palmivora is the most devastating disease in oil palm cultivation in America. Oil palms that survived BR epidemics were found in areas highly devastated by the disease; these palms were introduced into Cenipalma's in vitro micropropagation (cloning programme). A severity scale was developed for in vitro palms from five ortets inoculated with two different P. palmivora isolates. Then, eight ortets of Elaeis guineensis and two ortets of the OxG interspecific hybrid were evaluated in two inoculation trials under chamber growth conditions. The clone performance response was consistent with that reported in the field for the corresponding ortets, and two contrasting ortets, one susceptible (ortet 57) and one resistant (ortet 34) were identified. We monitored and compared defence responses to P. palmivora in the contrasting ortets. An increase in reactive oxygen species (ROS) production after inoculation with the pathogen was observed, with higher accumulation of H2O2 in the resistant plants. Catalase (CAT) activity in resistant plants increased after inoculation with the pathogen from 24 hr post‐infection (hpi) and remained high during the observation time. In the susceptible ortets, there was a significant increase on catalase activity only at 48 hpi. Peroxidase (POS) activity increased in clones from both susceptible and resistant ortets, but the increase was much greater in the susceptible ones. Phenylalanine ammonia lyase activity increased in response to inoculation, and these increases were greater in clones of the susceptible ortet than in clones of the resistant ortet.

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“…An F1 mapping population (MP01) created from crosses between two different parents that segregate for CWC has been used to identify QTLs associated with several traits, for instance pod color regulation (Motamayor et al, 2013 ), witches' broom (Silva et al, 2014 ; Royaert et al, 2016 ) and black pod resistance (Bahia et al, 2015 ; Barreto et al, 2015 ). Despite CWC being a lethal disease, few studies have focused on discovering molecular markers associated with resistance genes.…”

Section: Introductionmentioning

confidence: 99%

Mapping of a Major QTL for Ceratocystis Wilt Disease in an F1 Population of Theobroma cacao

Fernandes¹,

Royaert

Corrêa

et al. 2018

Front. Plant Sci.

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Cacao is an important crop, its beans are key raw materials for the chocolate and cosmetic industries. Ceratocystis wilt of cacao (CWC) caused by Ceratocystis cacaofunesta is a lethal disease for the crop. Therefore, the selection of resistant cacao varieties is one of the viable ways to minimize losses in cacao production. In this paper, we described the identification of a major QTL associated with CWC in an F1 mapping population from a cross between a resistant, “TSH 1188,” and a susceptible genotype, “CCN 51.” A set of 266 trees were genotyped using 3,526 single nucleotide polymorphic markers and then multiple QTL mapping analyses were performed. Two QTLs were identified on chromosomes IV and VI. The major QTL was located at 20 cM from the top position of chromosome VI, accounting for more than 60% of the phenotypic variation. The favorable allele T1, with haplotype GTT, came from the “TSH 1188” parent. It was evident that the haplotype combination T1C2 on chromosome VI was the most significant for resistance, since 93% of resistant trees had this haplotype. The major QTL converged to a genomic region of 739.4 kb that harbored nine candidate genes, including two major classes of resistance genes, which would make them the primary candidates involved in the resistance to CWC. The haplotypes detected are now used to improve the efficiency and precision of the selection of resistant trees in cacao breeding.

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Resistance to Black Pod Disease in a Segregating Cacao Tree Population

Cited by 16 publications

References 10 publications

QTL mapping and identification of corresponding genomic regions for black pod disease resistance to three Phytophthora species in Theobroma cacao L.

QTL mapping and identification of corresponding genomic regions for black pod disease resistance to three Phytophthora species in Theobroma cacao L.

Response of in vitro obtained oil palm and interspecific OxG hybrids to inoculation with Phytophthora palmivora

Mapping of a Major QTL for Ceratocystis Wilt Disease in an F1 Population of Theobroma cacao

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