Resumo

CAMPO-ARANA, RODRIGO-ORLANDO;; OBANDO-ECHEVARRIA, MARTÍN;  e  PEREZ-POLO, DAIRO;. Resistance of yam genotypes Dioscorea spp to anthracnose Colletotrichum gloeosporioides Penz. Rev.Bio.Agro [online]. 2023, vol.21, n.1, pp.85-96.  Epub 01-Jul-2023. ISSN 1692-3561.  https://doi.org/10.18684/rbsaa.v21.n1.2023.1985.

The yam Dioscorea spp., Is a crop of economic importance in the Colombian Caribbean, it is part of the food and sustenance diet for the producers. Anthracnose Colletotrichum gloeosporioides is one of the most limiting diseases in the production of yam, with losses between 50 and 100 % being reported in Colombia. The resistance to anthracnose was evaluated in 84 accessions of D. alata and 28 of D. rotundata, belonging to the collection of yam from the University of Córdoba, at 120, 150 and 180 days after sowing DDS, using a severity scale of 0-6. The accessions were classified according to their resistance, using the method of the sum of ranges of the area under the ABCPE progress curve and the method of severity at 120, 150 and 180 DDS. The severity at 180 DDS had a strong linear relationship r = 0,99 with the integral variable area under the ABCPE disease progression curve and the TPE disease progression rate. The classification of resistance by the rank sum method was the most efficient, identifying in D. alata 18 resistant R accessions, 24 moderately resistant MR, 26 moderately susceptible MS and 16 susceptible S. In the species D. rotundata were identified 5 accessions R, 8 MR, 8 MS, 6 S. The yam collection at the University of Córdoba has accessions with resistance to anthracnose, and it is important to start improvement work with these accessions to identify their agronomic characteristics.

Palavras-chave : Area under the curve of progress; Dioscorea alata; Dioscorea rotundata; Epidemiology; Fungal diseases; Genetic resistance; Germoplasm Bank; Plant pathology; Range sums method; Yam..

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