Genetic molecular diversity, production and resistance to witches' broom in cacao clones

Lima, Eline Matos; Pereira, Norma Eliane; Pires, José Luís; Barbosa, Antônia Marlene Magalhães; Corrêa, Ronan Xavier

doi:10.1590/s1984-70332013000200005

Cited by 7 publications

(6 citation statements)

References 17 publications

(15 reference statements)

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“…The genotypes considered susceptible were those with significantly higher DI than SCA6 and CCN51 and, finally, highly susceptible were those with higher DI than all patterns. The variability of resistance to witches' broom in selected genetic materials on local farms has been reported in important studies (Leal et al 2008;Lima et al 2013) and has been reinforced in this paper (Table 5). Numerically considering the value of DI, the distribution of genotypes was mostly more resistant than the Catongo variety and less resistant than the SCA6 clone (Fig.…”

Section: Resultssupporting

confidence: 74%

“…Studies have shown that there is variability in the sources of resistance to witches' broom that are distinguished from the descendants of Scavina-6 and that have good agronomic characteristics in genetic materials selected on local farms (Leal et al 2008;Lima et al 2013;Santos et al 2015). However, few resistant plants have been selected so far and there is a shortage of genetic information about them.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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.

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Médias dos resultados de sólidos solúveis totais (SST), acidez total titulável (ATT), relação entre o teor de SST e ATT (SST/ATT), potencial hidrogeniônico (pH), peso total de polpa (PTP) e rendimento de polpa (RP) entre clones de T. cacao L. * Médias seguidas de mesma letra na coluna pertencem ao mesmo agrupamento, pelo teste de Scott-Knott, a 0,05 de probabilidade Tabela 5. Médias dos resultados de número total de amêndoas (NTA), peso total de amêndoas secas (PTAS), peso médio de amêndoas secas (PMAS), largura média das amêndoas (LMA), espessura média das amêndoas (EMA), comprimento médio das amêndoas (CMA) entre clones de T. cacao L. corrobora com os resultados observados por Lima et al (2013b) (Matos et al, 2008). Esses resultados indicam que uma característica qualitativa não destrutiva como o formato de frutos pode mensurar a massa de frutos, o número de sementes e, consequentemente, o rendimento de polpa.…”

Section: Resultsunclassified

Caracterização de frutos de clones de cacaueiros na região litorânea de São Mateus, ES

Alexandre

Chagas

Marques

et al. 2015

Rev. bras. eng. agríc. ambient.

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R E S U M OObjetivou-se, com trabalho, avaliar a pós-colheita de clones de cacaueiros produzidos na região litorânea do norte do Espírito Santo, quanto às características físicas e químicas de seus frutos. As caracterizações físicas e químicas foram realizadas a partir de 10 frutos referentes a sete clones de cacau (CCN 10, CCN 51, CEPEC 2002, PH 15, PH 16, OS 1319 e TSH 1188. Foram avaliados o peso total, diâmetro e comprimento do fruto, peso da casca, espessura do sulco e da região mais espessa da casca, número, peso seco, largura, espessura e comprimento das amêndoas, sólidos solúveis totais (SST), acidez total titulável (ATT), pH da polpa e relação SST/ATT. As médias obtidas foram agrupadas pelo teste de Scott-Knott a 0,05 de probabilidade; em seguida, procedeu-se à análise da divergência genética. Foi observada a presença de divergência genética entre as populações estudadas ocorrendo a formação de três grupos pelo método de Tocher e dois grupos quando aplicado o Unweighted Pair-Group Method Average (UPGMA). Os clones CCN 10 e CCN 51 são os mais indicados para a produção de amêndoas e as variáveis, referentes ao tamanho do fruto, comprimento e diâmetro, foram as que mais contribuíram na diversidade genética dos genótipos.

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“…In the last two decades, the selection of WB-resistant parents with a high general and specific combining ability, along with the development of populations that contain a pool of genes for resistance, have been the target for cacao breeding in Brazil (2,5,11,14,15,19,23). The cacao populations were formed by progenies obtained in selection cycles for resistance to this disease through crosses between genotypes showing agronomically desirable characteristics and carrying resistance genes, generally from genetically distant sources (12,19).…”

Section: Introductionmentioning

confidence: 99%

Early selection for resistance to cacao witches’ broom in new parental combinations

2021

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Progenies from 69 crosses between parents obtained by recurrent selection for resistance and yield were inoculated with Moniliophthora perniciosa basidiospores. The symptoms were evaluated and compared with those in the equally inoculated progenies of Catongo, SIC 23 and SCA 6. Forty-three of the new progenies did not differ statistically from SCA 6, while 10 new progenies were statistically better than this control. The female parents that can be highlighted are (P4B x SCA 6), (MA 16 x SCA 6), (CEPEC 86 x SCA 6), and the EET 75 clone. The best male parents were (CAB 214), (CAB 208) and (P4B x OC 67), which did not differ from each other. This study proved the existence of gene combinations between fathers and mothers, the occurrence of additive effects and the dominant inheritance of these factors, which should allow the selection of clones with higher resistance levels and durability.

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Genetic molecular diversity, production and resistance to witches' broom in cacao clones

Abstract: -

Cited by 7 publications

References 17 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

Caracterização de frutos de clones de cacaueiros na região litorânea de São Mateus, ES

Early selection for resistance to cacao witches’ broom in new parental combinations

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