Response of cassava cultivars to African cassava mosaic virus infection across a range of inoculum doses and plant ages


Autoři: Jerome Anani Houngue aff001;  Justin S. Pita aff003;  Hermine Bille Ngalle aff002;  Martine Zandjanakou-Tachin aff004;  Apollin Fotso Kuate aff005;  Gilles Habib Todjro Cacaï aff001;  Joseph Martin Bell aff002;  Corneille Ahanhanzo aff001
Působiště autorů: Central Laboratory of Plant Biotechnology and Plant Breeding, Department of Genetics and Biotechnology, Faculty of Sciences and Techniques, University of Abomey-Calavi, Abomey-Calavi, Benin aff001;  Laboratory of Genetics and Plant Breeding, Department of Plant Biology, Faculty of Science, University of Yaoundé 1, Yaoundé, Cameroon aff002;  Laboratory of Plant Physiology, Université Felix Houphouët-Boigny, Abidjan, Cote d’Ivoire aff003;  Laboratory of Molecular Plant Pathology, School of Horticulture and Green Space Management, National University of Agriculture, Porto-Novo, Benin aff004;  International Institute of Tropical Agriculture (IITA), Nkolbisson, Yaoundé, Cameroon aff005
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: 10.1371/journal.pone.0226783

Souhrn

Cassava production in Africa is constrained by cassava mosaic disease (CMD) that is caused by the Cassava mosaic virus (CMV). The aim of this study was to evaluate the responses of a range of commonly cultivated West African cassava cultivars to varying inoculum doses of African cassava mosaic virus (ACMV). We grafted 10 cultivars of cassava plants with different inoculum doses of CMV (namely two, four, or six CMD-infected buds) when the experimental plants were 8, 10, or 12 weeks old, using non-inoculated plants as controls. Three cultivars showed disease symptoms when grafted with two buds, and four cultivars showed disease symptoms when grafted with four or six buds. Most cultivars became symptomatic six weeks after inoculation, but one (‘TMS92/0326’) was symptomatic two weeks after inoculation, and two (‘Ntollo’ and ‘Excel’) were symptomatic after four weeks. Root weight tended to be lower in the six-bud than in the two-bud dose, and disease severity varied with plant age at inoculation. These results indicate that the level of CMD resistance in cassava cultivars varies with inoculum dose and timing of infection. This will allow appropriate cultivars to be deployed in each production zone of Africa in accordance with the prevalence of CMD.

Klíčová slova:

Buds – Cassava – Infectious disease control – Leaves – Plant pathology – Plant viral pathogens – Planting – principal component analysis


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2019 Číslo 12