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Inheritance of Resistance to Aphid in Cowpea 1
Author(s) -
Bata H. D.,
Singh B. B.,
Singh S. R.,
Ladeinde T. A. O.
Publication year - 1987
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1987.0011183x002700050011x
Subject(s) - aphis craccivora , biology , backcrossing , aphid , vigna , aphididae , infestation , agronomy , cultivar , myzus persicae , pest analysis , resistance (ecology) , botany , horticulture , genetics , homoptera , gene
Aphid ( Aphis craccivora Koch) is a major pest of cowpea [ Vigna unguiculata (L.) Walp.] particularly in the drier regions of the tropics. It causes direct damage by feeding on the plants and also transmits viruses. Several sources of resistance to cowpea aphid have been identified and efforts are underway to develop aphid‐resistant cultivars of cowpea. This study was undertaken to elucidate the inheritance of resistance to aphid in cowpea. Three resistant lines were used in the study. Parental, F 1 , F 2 , F 3 , and backcross populations involving resistant ✕ susceptible and resistant ✕ resistant lines were evaluated in the greenhouse using artificial infestation with aphids. The F 1 plants in all the crosses were resistant and the F 2 populations derived from all the crosses involving resistant and susceptible parents segregated into 3 resistant:1 susceptible ratio. The backcross populations involving susceptible parents segregated into 1 resistant:1 susceptible ratio, whereas the backcross populations involving resistant parents were completely resistant. The F 3 progenies derived from resistant F 2 plants showed a ratio of 1/3 true breeding resistant:2/3 segregating like F 2 's. These data indicated monogenic dominant inheritance of aphid resistance. The gene symbol Rac (resistance to Aphis craccivora ) is being assigned for this trait.