Cacao families and parents selected as resistant to natural infection of Moniliophthora perniciosa

Benjamin, Carolina Santos; Luz, Edna Dora Martins Newman; Santos, Wedisson Oliveira; Pires, J.L.

doi:10.1590/1984-70332016v16n2a21

Cited by 14 publications

(22 citation statements)

References 6 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In turn, the CCN51 clone selected in Ecuador, is the result of a breeding between ICS-95, IMC-67 and Canelus, and has been considered a carrier of a moderate resistance to witches' broom (Campo and Andía 1997;Boza et al 2014). Finally, the Catongo variety (Theobroma leiocarpa Bernoulli), first found in the mid-1930s in Pirangi, Bahia, is considered an albino mutation of Forastero cacao (Dantas Neto et al 2005) and is often used as a pattern for susceptibility to witches' broom (Pimenta Neto et al 2018;Benjamin et al 2016). Significant effects for DI between 96 cacao genotypes under study were found (p < 0.01).…”

Section: Resultsmentioning

confidence: 93%

See 1 more Smart Citation

Resistance to witches’ broom in adult plants and progeny of local varieties of cacao in Southern Bahia

et al. 2020

View full text Add to dashboard Cite

Plants of local cacao variety from Southern Bahia were evaluated in order to verify if there are different levels of resistance to witches' broom disease in the study population and if the evaluation of adult plants in the field is a good predictor of these resistance levels. The seedlings were maintained under greenhouse conditions and inoculated with the fungus Moniliophthora perniciosa. Evaluations of symptoms occurred 60 days after inoculation. In the field, the same genotypes were evaluated by counting the number of dry brooms per plant, per year, and assessing trunk diameter size. The data were subjected to analysis of variance and averages grouped by the Scott-Knott test, differentiated by Tukey's test and compared by Student's T test. The Scavina-6 and CCN51 clones as well as the Catongo variety were used as resistance, moderate resistance and susceptibility patterns, respectively. Twenty-eight percent of the genotypes were among the most resistant and the genotypes 4119 and 4033 were considered the most susceptible to the disease in both field and greenhouse evaluations. Field evaluation was promising as a predictor of resistance level. The selected materials presented good characteristics for witches' broom resistance, with different levels deserving special attention in the context of reducing the vulnerability of Brazilian cacao cultivation to the effects of the disease, especially in the cacao region of Bahia.

show abstract

Section: Resultsmentioning

confidence: 93%

“…Studies of identification and selection of new sources of resistance to witches' broom involve steps developed in a greenhouse and/or field (Benjamin et al 2016;Pimenta Neto et al 2018). The methodologies are equally important and complementary (not exclusive); however, they may require excessive time and resources when performed together.…”

Section: Introductionmentioning

confidence: 99%

Resistance to witches’ broom in adult plants and progeny of local varieties of cacao in Southern Bahia

et al. 2020

View full text Add to dashboard Cite

show abstract

“…NA 33 and CSUL 7, also known as WB-resistant clones, and considered elite parents among those tested in one of the diallels (8 × 8) of the 1st cycle of recurrent selection (Benjamin et al 2014(Benjamin et al , 2016 originated another high WB-resistant progeny (35). These results attest to the efficiency of the selection process carried out by the Genetic Improvement Program of cacao in Brazil.…”

Section: Discussionmentioning

confidence: 99%

“…It is proven that SCA clones have alleles/genes of WB resistance (Kuhn et al 2003, Faleiro et al 2006, and although under certain circumstances the resistance of progenies of these SCA clones was overrun in the field, (Pires et al, 2012a, Benjamin et al 2016 and M. perniciosa strains capable of infecting them have already been selected (Patrocinio et al 2012), other progenies maintained resistance when the second parent was also resistant (Benjamin et al 2016, Pires et al 2012b. It is noteworthy that the resistance behavior of SCA 6 progenies used for artificial inoculations in the greenhouse is stable (Albuquerque et al 2010, Benjamin et al 2014, which was also evidenced in this study, in spite of the variation in the pathogen inoculum used.As the brooms are collected in the field experimental areas of CEPEC, and renewed every six months in the broomchamber for the production of basidiomes and storage of basidiospores used in inoculations, the possible evolution of the pathogen is therefore, theoretically, accompanied.…”

Section: Discussionmentioning

confidence: 99%

Selection of cocoa progenies for resistance to witches’ broom

Neto

Laranjeira

Pires

et al. 2018

Trop. plant pathol.

View full text Add to dashboard Cite

Witch's broom (WB) and frost pod rot (FPR) are devastating fungal diseases and responsible for severe losses in cacao trees grown in tropical America. To expand and stabilize the resistance to WB in cacao progenies, as well as to incorporate resistance genes to FPR, 17 genotypes were selected from a structured population. These were used in a second selection cycle, in which four gene donors of FPR resistance were included. All but one of the 59 and 52 progenies differed significantly (P < 0.05) from the susceptible controls Catongo and SIC 23, respectively. Nineteen progenies differed significantly (P < 0.05) from the resistance control SCA 6, suggesting high WB resistance. The direct descendants of cacao genotypes from the Brazilian Amazon and from clones carrying FPR resistance showed lower disease index than the resistant control SCA 6, except for some of the progenies of clone ICS 95, which behaved similarly to the susceptible control. The study highlights nine progenies carrying WB resistance genes from several sources and seven of them from parents carrying frosty pod resistance genes.

show abstract

“…By necessity, artificial inoculations with defined inoculum sources have been used in screening for FPR tolerance in the field. Tolerance against WBD is much less studied, with the focus of breeding being the development of resistance to broom formation (Benjamin et al , ). Black pod rot can develop rapidly and artificial inoculations of detached and attached fruits has been carried out (Acebo‐Guerrero et al , ).…”

Section: Introductionmentioning

confidence: 99%

A disease and production index (DPI) for selection of cacao (Theobroma cacao) clones highly productive and tolerant to pod rot diseases

et al. 2020

View full text Add to dashboard Cite

Frosty pod rot (FPR) (Moniliophthora roreri), along with black pod rot (Phytophthora species) and witches’ broom disease (Moniliophthora perniciosa) constitute the main phytosanitary problems limiting cacao (Theobroma cacao) production causing severe yield losses. One of the main sought after methods of pod rot management is the selection of tolerant cacao genotypes. Typically, the selection is carried out through the quantification of the percentage of diseased pods (PDP). However, PDP does not consider the relative productivity, or production potential (PT) of the genotype. Production potential can vary among cacao genotypes. Consequently, genotypes with similar PT can have similar or vastly different disease tolerance levels as measured by PDP. The disease and production index (DPI) was developed to integrate a genotype's tolerance to M. roreri and other diseases as measured by PDP, with its PT. Here, we evaluated the number of healthy pods, number of diseased pods, and weight of fresh seed for 29 clones grown in replicated five‐tree plots over 4 years. The data obtained was used to calculate PDP and DPI for each clone for three different disease combinations: frosty pod rot alone, pod rots other than frosty pod rot, and the combination of all pod rots. Multivariate analysis verified that DPI discriminated between clones based on productivity and disease tolerance. Surprisingly, there was a close ranking of clones between resistance to FPR and resistance to all other pod rots. The DPI can be used in breeding programmes focused on the selection of high yielding disease‐tolerant cacao genotypes.

show abstract

Cacao families and parents selected as resistant to natural infection of Moniliophthora perniciosa

Cited by 14 publications

References 6 publications

Resistance to witches’ broom in adult plants and progeny of local varieties of cacao in Southern Bahia

Resistance to witches’ broom in adult plants and progeny of local varieties of cacao in Southern Bahia

Selection of cocoa progenies for resistance to witches’ broom

A disease and production index (DPI) for selection of cacao (Theobroma cacao) clones highly productive and tolerant to pod rot diseases

Contact Info

Product

Resources

About