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Resistance to Black Pod Disease in a Segregating Cacao Tree Population

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Abstract

Black pod disease caused by Phytophthora spp. is the most important cacao tree disease worldwide. Genetic resistance has received much attention for the reduction of economic and environmental costs. In the present work, leaf disks from 282 individuals [F1(TSH-1188xCCN-51)] were inoculated using suspensions of 3 × 105 zoospores of Phytophthora palmivora and Phytophthora citrophthora. Twenty disks of each genotype were distributed in four blocks with five disks per plot. After 5 days, each inoculated leaf disk was assessed for the infection level. It was verified statistically that the progeny's parents were intermediate between the control clones Catongo (susceptible) and Sca-6 (resistant). A highly positive linear relationship was observed between infection levels caused by both Phytophthora species in the F1 progeny (r = 0.9935**). However, the interaction was highly significant. It was also observed that the curve distribution is skewed towards higher resistance. This suggests that few genes are involved in controlling the resistance to both species, and that they maybe linked and species-specific. Although the parents did not differ statistically, the F1 progeny segregated for resistance to each Phytophthora species and it is therefore an adequate population for breeding for resistance to black pod.

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Acknowledgments

The authors are grateful to Lindolfo Santos Filho and Ronaldo Carvalho Santos for suggestions on statistical analysis. Thanks to the MARS Center for Cocoa Sciences (Mars Inc.) for logistic support provided, and for keeping the population in the experimental station. EDMNL and RXC were recipient of fellowships from CNPq, and CIAV was recipient of a fellowship from CAPES (23038035892/2008-01).

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Author notes

  1. Carlos Ivan Aguilar-Vildoso

    Present address: Instituto de Biodiversidade e Florestas, UFOPA, Universidade Federal do Oeste do Pará, Rua Vera Paz s/n, Bairro Salé, 68035-110, Santarém, PA, Brazil

Authors and Affiliations

  1. Departamento de Ciências Biológicas, Centro de Biotecnologia e Genética, Universidade Estadual de Santa Cruz, Rodovia Jorge Amado, km 16, 45662-900, Ilhéus, BA, Brazil

    Rita de Cássia Bahia, Carlos Ivan Aguilar-Vildoso & Ronan Xavier Corrêa

  2. Centro de Pesquisas do Cacau, Comissão Executiva do Plano da Lavoura Cacaueira, Seção de Genética, Caixa Postal 07, 45600-970, Itabuna, BA, Brazil

    Edna Dora Martins Newman Luz & Uilson Vanderlei Lopes

  3. MARS Center for Cocoa Science, Caixa Postal 55, 45630-000, Barro Preto, BA, Brazil

    Regina Celle Rebouças Machado

Authors
  1. Rita de Cássia Bahia
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  2. Carlos Ivan Aguilar-Vildoso
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  3. Edna Dora Martins Newman Luz
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  4. Uilson Vanderlei Lopes
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  5. Regina Celle Rebouças Machado
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  6. Ronan Xavier Corrêa
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Correspondence to Ronan Xavier Corrêa.

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Bahia, R.C., Aguilar-Vildoso, C.I., Luz, E.D.M.N. et al. Resistance to Black Pod Disease in a Segregating Cacao Tree Population. Trop. plant pathol. 40, 13–18 (2015). https://doi.org/10.1007/s40858-014-0003-7

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  • DOI: https://doi.org/10.1007/s40858-014-0003-7

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