Quantitative resistance to witches’ broom disease in progenies of different sources of resistance

Pereira, Alezania Silva; Lopes, Uilson Vanderlei; Pires, José Luís; Barreto, Mariana Araújo; Santos, Lindolfo Pereira dos; Gonzaga, Renato Santos; Silva, Lorena Souza da; Andrade, Franco Jesus de; Bonilla, José Luis Solís; Gramacho, Karina Peres

doi:10.1016/j.cropro.2021.105678

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…However, the behavior of the ten progenies with TSH1188 as a parent, which is an SCA descendant, varied depending on the resistance of the maternal. While testing the progenies from crosses of other sources with SCA6 for resistance to WB, Pereira et al (2021) confirmed the additive effect of SCA6 resistance when crossed with WB-resistant maternals.…”

Section: E Santos Et Almentioning

confidence: 77%

“…CSUL3 is a BPRresistant clone (Luz et al 1996) collected from Cruzeiro do Sul (Acre State), and its progenies have shown resistance to WB in field evaluations (Benjamin et al 2016). Pereira et al (2021) observed the high performance of CSUL3 as a parent, which was resistant to vegetative and floral cushion brooms, demonstrating its ability to reduce the infection potential of the pathogen and its evolution.…”

Section: E Santos Et Almentioning

confidence: 99%

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Cacao parents help their offsprings to fight witches’ broom and black pod rot infections

Santos

Pires

Monteiro

et al. 2022

Crop Breed. Appl. Biotechnol.

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Searching for new approaches to confer resistance to diseases in plants is one of the main objectives of the Cacao breeding program (CBP). Witches' broom (WB) and black pod rot (BPR) are important cacao diseases in Bahia,Brazil. This study aimed to evaluate the resistance in plants from 40 progenies of genetic crosses between elite clones to natural infection by high levels of Moniliophthora perniciosa and Phytophthora spp. WB and BPR infection assessments were conducted in the field, including evaluation of vegetative brooms (VB), cushion brooms (CB), and total brooms (TB), as well as the percentage of WB-diseased (FRUWB) and BPR-diseased (FRUBPR) fruits. Ten progenies showed resistance to infection in both the canopy and fruits. No significant differences between the progenies were detected for FRUBPR.

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Section: E Santos Et Almentioning

confidence: 77%

Section: E Santos Et Almentioning

confidence: 99%

Cacao parents help their offsprings to fight witches’ broom and black pod rot infections

Santos

Pires

Monteiro

et al. 2022

Crop Breed. Appl. Biotechnol.

Self Cite

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“…The non-significance of GHI and the high genotypic correlation across environments indicate that the resistance to witches' broom was stable throughout the evaluated years. From this result, one may presume that i) early selection may be suitable for this trait; and ii) the presence of favourable alleles from different sources contributed to elevating the trait's stability, despite the different pathogen pressures and environmental conditions (Albuquerque et al, 2010;Benjamin et al, 2016;Pereira et al, 2021). Recall that the evaluated hybrid families are a combination of three clones, which supposedly hold resistance alleles.…”

Section: Resultsmentioning

confidence: 99%

Genetic evaluation of Theobroma grandiflorum hybrid families for fruit yield and resistance to witches’ broom

Chaves

Dias

Alves

et al. 2022

Preprint

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Theobroma grandiflorum is a perennial fruit-bearing species with a long breeding cycle (~ 12 years). In multi-harvest data analyses, one frequently observes heteroscedasticity and genetic/statistical imbalance, which requires adequate statistical methods. This study aimed to compare the adequacy of multi-harvest models with homogenous and heterogeneous residual variance and to define the optimal number of harvests for an accurate genetic selection of T. grandiflorum families with high fruit yield persistence and resistance to witches’ broom. We used a generalized linear mixed model to analyse the resistance to witches’ broom. The data refers to an unbalanced trial with 34 triple-cross hybrid families, arranged in a randomized complete block design. We evaluated these families throughout nine consecutive harvests regarding fruit yield and resistance to witches’ broom. The variance components, genetic parameters and genotypic values were estimated/predicted through residual maximum likelihood/best linear unbiased prediction methodologies. The model with heterogeneous residuals had a better fit than the homogeneous model for the fruit yield trait, according to Akaike information criterion. The results attest to the genetic variability in the evaluated population. To select the best individual for the next breeding cycle, three and two harvests are enough for selecting accurately for fruit yield and resistance to witches’ broom, respectively. For commercial release, nine harvests are necessary for both traits. We identified ten high-performance families regarding fruit yield persistence and resistance to witches’ broom.

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“…Resistance to WBD was observed in wild cacao populations, such as C SUL and SCA accessions, both collected in the upper Amazon and used by breeding programs in Brazil (Bennett, 2003; Marita et al., 2001; Paim et al., 2006; Pimenta Neto et al., 2018). However, because M. perniciosa in Brazil could overcome the disease resistance of SCA 6, the primary source of disease resistance, new resistant cultivars are needed to sustain the cacao production (Pereira et al., 2021). Thus, field evaluations of WBD in Brazil using 11 cacao genotypes with wide geographic origin identified the wild cacao accessions C SUL‐3 (collected in Western Amazon, Brazil) and GU‐171 (collected in French Guyana) as novel sources for the WBD resistance (Pereira et al., 2021).…”

Section: Genetic Basis Of Agronomic Traitsmentioning

confidence: 99%

Geographic distribution, conservation, and genomic resources of cacao Theobroma cacao L

2023

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The cacao tree, Theobroma cacao L., is cultivated in the tropics, mainly in agroforestry systems, to produce seeds, the valuable raw material for the chocolate industry. Thus, the conservation and use of cacao genetic resources in breeding programs to increase yield and improve quality and disease resistance are vital for the global cacao economy. We review three important topics of cacao genetics essential for sustainable production and crop improvement: (1) geographic distribution of wild cacao populations and geographic patterns of their genetic variation in Amazonia; (2) conservation, availability, and use of cacao genetic resources in cultivar development; (3) genetic basis of agronomic traits, available molecular genetic markers, and genomic resources and their application for cacao improvement. We also highlight critical research areas needed to achieve sustainable cacao cultivation.

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Quantitative resistance to witches’ broom disease in progenies of different sources of resistance

Cited by 8 publications

References 16 publications

Cacao parents help their offsprings to fight witches’ broom and black pod rot infections

Cacao parents help their offsprings to fight witches’ broom and black pod rot infections

Genetic evaluation of Theobroma grandiflorum hybrid families for fruit yield and resistance to witches’ broom

Geographic distribution, conservation, and genomic resources of cacao Theobroma cacao L

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