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environmental factors. A quarter of the world's population is threatened by this problem, and most of them are from the developing countries of Africa and Asia. Among all leguminous crops, cowpea [ Vigna unguiculate (L.) Walp.] has a relatively high adaptation

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tolerate limited water supplies at early vegetative growth could be an affordable solution to overcome drought conditions. Reports showed that impacts of drought on crops such as cowpea have been acute in tropical and subtropical regions ( Carvalho et al

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Four southernpea (cowpea) [Vigna unguiculata (L.) Walp.] cultivars representing various combinations of resistance and susceptibility to blackeye cowpea mosaic virus (BlCMV) and southern root-knot nematode [Meloidogyne incognita (Kofoid and White) Chitwood] were used to determine effectiveness of simultaneous screening of plants for resistance to both pathogens. Plants were inoculated with both pathogens simultaneously, each pathogen separately, or left uninoculated as controls. The resistance classification of the cultivars based on treatments with only one pathogen was not different from that based on the treatment with both pathogens. Virus × nematode interaction was not a significant source of variation in BlCMV symptoms and root-knot nematode galls. Simultaneous screening for both pathogens in southernpeas appears to be a feasible option.

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Abstract

A single recessive gene, blc, controls resistance to blackeye cowpea mosaic virus (B1CMV) in progeny from a cross between southernpea (cowpea) cultivars ‘Worthmore’ (homozygous resistant) and ‘California Blackeye No. 5’ (homozygous susceptible). All F1 plants and backcrosses to the susceptible parent were susceptible, indicating that resistance is recessive to susceptibility. Backcrosses to the resistant parent segregated 1 susceptible: 1 resistant and F2 plants segregated 3 susceptible:1 resistant.

Open Access

Cowpea [ Vigna unguiculata (L.) Walp], an annual legume native to tropical and subtropical regions, is a protein-rich crop that complements staple cereal for human and fodder for livestock and also provides soil improvement benefits through

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