IDENTIFICATION OF SOURCES OF RESISTANCE AGAINST CHARCOAL ROT IN COWPEA

Kecia Mayara Galvão de Araújo; Luan Felipe Santos do  Nascimento; Pedro Ivo Silvestre  Siqueira e Silva; Jerônimo Constantino Borel; Kaesel Jackson Damasceno e Silva; Francine Hiromi Ishikawa

doi:10.1590/1983-21252022v35n305rc

Authors

Kecia Mayara Galvão de Araújo Collegiate of biological sciences, Universidade Federal do Vale do São Francisco, Petrolina, PE https://orcid.org/0000-0003-2402-6777
Luan Felipe Santos do Nascimento Collegiate Agronomic Engineering, Universidade Federal do Vale do São Francisco, Petrolina, PE https://orcid.org/0000-0002-8317-4684
Pedro Ivo Silvestre Siqueira e Silva Collegiate Agronomic Engineering, Universidade Federal do Vale do São Francisco, Petrolina, PE https://orcid.org/0000-0003-1257-8814
Jerônimo Constantino Borel Collegiate Agronomic Engineering, Universidade Federal do Vale do São Francisco, Petrolina, PE https://orcid.org/0000-0002-5774-5607
Kaesel Jackson Damasceno e Silva Embrapa Meio-Norte, Teresina, PI https://orcid.org/0000-0001-7261-216X
Francine Hiromi Ishikawa Collegiate Agronomic Engineering, Universidade Federal do Vale do São Francisco, Petrolina, PE https://orcid.org/0000-0002-7491-2657

DOI:

https://doi.org/10.1590/1983-21252022v35n305rc

Keywords:

Cowpea breeding. Germoplasm. Macrophomina phaseolina. Genetic resistance. Vigna unguiculata.

Abstract

Cowpea [Vigna unguiculata (L.) Walp.] is an important socioeconomic crop in Brazil, mainly in the Northeast and more recently in the Midwest of Brazil. Charcoal rot caused by Macrophomina phaseolina (Tassi) Goid, is an important disease in semiarid regions, where edaphoclimatic conditions are favorable to the development of disease. The aim of this study was to evaluate the response of 100 cowpea lines to two isolates of M. phaseolina. The experiments were conducted in a completely randomized design, with five replications (two plants per pot). The main variables evaluated were lesion length and relative growth compared to control (RGCC). Among the evaluated accessions, 15% of the lines were resistant to isolate 59 and 11% of the lines were resistant to isolate CMM 2106 of M. phaseolina. Therefore, these accessions can be used as a source of resistance to M. phaseolina by farmers directly as new cultivars or in future hybridizations of cowpea genetic breeding programs.

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