Abstract
Alectra vogelii Benth. is the second most important parasitic weed in cowpea [Vigna unguiculata (L.) Walp.] production in Burkina Faso. Several resistant varieties to this weed have been identified in the country among which are B301 and KVx414-22-2. The inheritance and allelic relationships of the resistance genes in the two varieties have not been studied with A. vogelii strains in Burkina Faso. The objective of this study was to determine the inheritance and allelic relationship of the resistance genes in B301 and KVx414-22-2. To determine the inheritance of the genes for resistance, the resistant varieties (B301 and KVx414-22-2) were each crossed to a susceptible variety IT82D-849 to generate F1 and F2 populations. For the allelic relationship study the two resistant genotypes were crossed among themselves to generate F1 and F2 offspring. The parents and their F1 and F2 progenies were screened in artificially infested pots with Alectra seed in a screen house at Kamboinsé Research Station in Burkina Faso. Resistance/susceptibility of genotypes was assessed by recording the number of emerged Alectra shoots. The data were subjected to the Chi-Square goodness-of-fit test for one, two and three genes segregation ratios. The results revealed that two independent dominant genes confer resistance in the variety B301 and a single dominant gene confers resistance in variety KVx414-22-2. The single dominant gene in KVx414-22-2 is non-allelic to the two genes in B301. The two resistance genes in variety B301 have already been named Rav1 and Rav2 whilst Rav3 is the name of the resistance gene in variety IT81D-994. Therefore, we propose the symbol Rav4 as the name for the resistance gene in variety KVx414-22-2.
Highlights
IntroductionWalp.) is one of the major grain legumes produced in semi-arid and arid areas of the world
The genetic material used in this study comprised a susceptible genotype, IT82D-849 and two resistant genotypes, B301 and KVx414-22-2 (Dieni et al, 2018) used as parents
The F2 progenies derived from the cross between IT82D-849 and B301 segregated into a ratio of 15R:1S confirming that two dominant genes confer the resistance to Alectra vogelii in B301as reported by Atokple et al (1993) and Singh et al (1993)
Summary
Walp.) is one of the major grain legumes produced in semi-arid and arid areas of the world. Africa is by far the largest cowpea producing continent in the world. The African continent is the area where the most devastating cowpea production constraints prevail (drought, insect pests, diseases and parasitic weeds) (Singh & Allen, 1979; Horn & Shimelis, 2020). Both abiotic and biotic constraints very often lead to significant yield losses. Parasitic weeds Alectra vogelii and Striga gesnerioides are two major cowpea production constraints in Africa. Yield losses ranging from 80% to 100% due to A. vogelii infestation have been reported (Mbwaga, Hella, Mligo, Kabambe, & Bokosi, 2011; Kabambe et al, 2013)
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