African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6669

Full Length Research Paper

Assessment of water yam (Dioscorea alata L.) landrace varieties for resistance to anthracnose disease

Lassana BAKAYOKO
  • Lassana BAKAYOKO
  • UFR Biosciences, Université Félix Houphouët Boigny, 22 P.O. Box 582 Abidjan, Côte d’Ivoire.
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Desire N’Da POKOU
  • Desire N’Da POKOU
  • Centre National de Recherche Agronomique (CNRA), Laboratoire Central de Biotechnologie (LCB), 01 P. O. Box 1740 Abidjan 01, Côte d’Ivoire.
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Brice Sidoine ESSIS
  • Brice Sidoine ESSIS
  • Centre National de Recherche Agronomique (CNRA), Station de Recherche sur les Cultures Vivrières (SRCV), 01 P. O. Box 633 Bouaké, Côte d’Ivoire.
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Amani Michel KOUAKOU
  • Amani Michel KOUAKOU
  • Centre National de Recherche Agronomique (CNRA), Station de Recherche sur les Cultures Vivrières (SRCV), 01 P. O. Box 633 Bouaké, Côte d’Ivoire.
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Konan Evrard Brice DIBI
  • Konan Evrard Brice DIBI
  • Centre National de Recherche Agronomique (CNRA), Station de Recherche sur les Cultures Vivrières (SRCV), 01 P. O. Box 633 Bouaké, Côte d’Ivoire.
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Abou Bakari KOUASSI
  • Abou Bakari KOUASSI
  • UFR Biosciences, Université Félix Houphouët Boigny, 22 P.O. Box 582 Abidjan, Côte d’Ivoire.
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Boni N’ZUE
  • Boni N’ZUE
  • Centre National de Recherche Agronomique (CNRA), Station de Recherche sur les Cultures Vivrières (SRCV), 01 P. O. Box 633 Bouaké, Côte d’Ivoire.
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Tchimon Timothee KOUTOUAN
  • Tchimon Timothee KOUTOUAN
  • Centre National de Recherche Agronomique (CNRA), Station de Recherche sur les Cultures Vivrières (SRCV), 01 P. O. Box 633 Bouaké, Côte d’Ivoire.
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Goli Pierre ZOHOURI
  • Goli Pierre ZOHOURI
  • Centre National de Recherche Agronomique (CNRA), Laboratoire Central de Biotechnologie (LCB), 01 P. O. Box 1740 Abidjan 01, Côte d’Ivoire.
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Assanvo Simon Pierre N’GUETTA
  • Assanvo Simon Pierre N’GUETTA
  • UFR Biosciences, Université Félix Houphouët Boigny, 22 P.O. Box 582 Abidjan, Côte d’Ivoire.
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Paterne AGRE
  • Paterne AGRE
  • International Institute of Tropical Agriculture (IITA), PMB 5320, Ibadan, Oyo State, Nigeria.
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Jean Mubalama MONDO
  • Jean Mubalama MONDO
  • Department of Crop Production, Université Evangélique en Afrique, P. O. Box 3323, Bukavu, Democratic Republic of Congo.
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Patrick ADEBOLA
  • Patrick ADEBOLA
  • International Institute of Tropical Agriculture (IITA), PMB 5320, Ibadan, Oyo State, Nigeria.
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  •  Received: 19 May 2021
  •  Accepted: 22 September 2021
  •  Published: 31 March 2022

Abstract

Yam anthracnose disease (YAD), caused by the fungus Colletotrichum gloeosporioides Penz, is the most damaging fungal disease of Dioscorea alata yam worldwide. Local yam varieties, which sustain Côte d'Ivoire’s farmers and other end-users livelihoods, are highly susceptible to this pathogen. Thus, there is a need for developing new yam cultivars to sustain yam production in Côte d'Ivoire. To achieve such objective, identifying and selecting sources of resistance within the existing germplasm is crucial prior to the establishment of a breeding program. This study, therefore, aimed at determining the field resistance to C. gloeosporioides of 115 D. alata landrace varieties. Field experiments were conducted at the Research Station for Food Crops (SRCV) of the CNRA, Bouaké City, in Central Côte d'Ivoire, for three growing seasons. Results showed that symptoms of the anthracnose disease were more noticeable four months after planting (P3): high disease severity and incidence scores. At this period, ‘Betebete’ group (DSS = 3.40 and DI = 99.81%) was the most sensitive to anthracnose disease across years. In contrast, ‘Brazo’ (DSS = 2.24 and DI = 94.81%) and ‘Florido’ (DSS = 2.59 and DI = 97.23%) groups were the least sensitive. This finding indicates that local yam accessions from Côte d’Ivoire have different sensitivity levels to anthracnose disease attacks. Therefore, the genetic diversity from this work should be further exploited by yam breeding and genetic improvement programs for developing cultivars, combining resistance to YAD, high yield potential, and superior tuber quality to meet producers and consumers’ needs.

Key words: Anthracnose, Côte d'Ivoire, disease resistance, environment, Dioscorea alata, plant breeding.