DENTIFICATION OF COWPEA GENOTYPES RESISTANT TO FUSARIUM WILT

Fusarium wilt, caused by soil-borne Fusarium oxysporum f. sp. tracheiphilum (Fot), can reduce cowpea bean yield. Considering that genetic control through resistant genotypes is pivotal for Fusarium wilt control, the aim of the present study was to identify cowpea genotypes that are resistant to Fot...

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Bibliographic Details
Published inCaatinga Vol. 34; no. 4; p. 957
Main Authors Risoneide de Cássia Zeferino Silva, da Silva, Anthony Carlos, Rezanio Martins Carvalho, Antonio Félix da Costa, Nicoli, Alessandro, Rios, Jonas Alberto
Format Journal Article
LanguageEnglish
Portuguese
Published Mossoro Universidade Federal Rural do Semiárido 01.10.2021
Subjects
Agronomy
Conidia
Cowpeas
Cultivars
Experiments
Fusarium
Fusarium oxysporum
Genetic control
Genotypes
Germplasm
High resistance
Inoculation
Vigna unguiculata
Wilt
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Summary:Fusarium wilt, caused by soil-borne Fusarium oxysporum f. sp. tracheiphilum (Fot), can reduce cowpea bean yield. Considering that genetic control through resistant genotypes is pivotal for Fusarium wilt control, the aim of the present study was to identify cowpea genotypes that are resistant to Fot from the Germplasm Bank of the Pernambuco Agronomic Institute, Embrapa Middle North, and other producing areas in the North and Northeast regions of Brazil. The cultivar BR-17 Gurguéia was used as a susceptible control and MNCO1-649F-2-1 was used as a resistant control. Two experiments were carried out in a completely randomized design in the greenhouse of the Department of Agronomy of the University Federal Rural of Pernambuco. Plants with the first pair of expanded leaves were inoculated with a conidial suspension (106 conidia/mL) using the conidia root-immersion methodology. Fusarium wilt severity in plants was assessed 21 d after inoculation, with the aid of a descriptive scale. In the first experiment, we evaluated the resistance of 38 cowpea genotypes, of which 19 (5 moderately resistant and 14 resistant) were selected for the second experiment. In the first experiment, four genotypes (Canapu PE, Miranda IPA 207, Esperança, and BRS Pujante) did not show any symptoms of Fusarium wilt. In the second, 15 genotypes showed high resistance to Fot, including Canapu PE and Miranda IPA 207, which again had no symptoms of Fusarium wilt. In conclusion, this study identified that the genotypes, Canapu PE, Miranda IPA 207, Esperança, and BRS Pujante have greater resistance to Fusarium wilt.
ISSN:0100-316X
1983-2125