Genetic analysis of groundnut rosette virus disease in groundnut (Archis hypogaea L.)

Usman, A. and Ofori, K. and Danquah, E.Y. and Offei, S.K. and Ado, S.G. (2015) Genetic analysis of groundnut rosette virus disease in groundnut (Archis hypogaea L.). African Journal of Plant Science, 9 (3). pp. 115-123.

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Abstract

Groundnut chlorotic rosette disease (GCRD) transmitted by the aphid, Aphis craccivora, is an important virus disease of groundnut in Africa. Breeding for host resistance remains the best strategy to minimize losses due to this disease. Nine cultivated groundnut genotypes with differential reaction to GCRD were crossed in an incomplete diallel mating design to determine the combining ability of GCRD resistance. The parents and 36 F2 populations were inoculated with veruliferous A. craccivora at the seedling stage and evaluated for disease reaction at two locations in Nigeria in 2012. Disease incidence (based on visual symptoms) was recorded three times at fortnightly interval using area under disease progress curve. General combining ability (GCA) and specific combining ability (SCA) effects for GCRD resistance were highly significant (P < 0.01), indicating that both additive and non-additive gene effects governed the inheritance of GCRD resistance. The Baker ratio was low (0.3) for GCRD indicating that non-additive gene effects was more important than additive gene effects in controlling GCRD resistance in these crosses. As a result, progeny performance could not be adequately predicted from GCA effects alone. Therefore, effective selection of superior genotypes would be achieved at advanced generations when maximum homozygosity is attained

Item Type: Article
Uncontrolled Keywords: Groundnut chlorotic rosette disease, area under disease progress curve, combining ability, additive and non-additive gene effects
Author Affiliation: Department of Plant Science, Institute for Agricultural Research, Ahmadu Bello University, Zaria, Nigeria
Subjects: Crop Improvement
Divisions: Groundnut
Depositing User: Mr T L Gautham
Date Deposited: 17 Apr 2015 04:03
Last Modified: 17 Apr 2015 04:03
Official URL: http://dx.doi.org/10.5897/AJPS2015.1264
URI: http://eprints.icrisat.ac.in/id/eprint/13640

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