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Inheritance of resistance to groundnut rosette virus in groundnut ( Arachis hypogaea L.)
Author(s) -
NIGAM S. N.,
BOCK K. R.
Publication year - 1990
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1990.tb04821.x
Subject(s) - biology , arachis hypogaea , cultivar , rosette (schizont appearance) , backcrossing , inoculation , arachis , population , horticulture , plant virus , plant disease resistance , botany , agronomy , veterinary medicine , virus , genetics , gene , medicine , demography , sociology , immunology
Summary A method of field screening groundnut seedlings for resistance to groundnut rosette virus (GRV), by means of which over 97% incidence was induced in rows of susceptible test plants, was developed at Chitedze Research Station in Malawi. Two GRV‐resistant Virginia cultivars (RG 1 and RMP 40) were crossed with three susceptible cultivars, one from each of the Spanish (JL 24), Valencia (ICGM 48) and Virginia (Mani Pintar) botanical groups. Twelve F 1 reciprocal crosses and their F 2 and backcross generations were produced and the material screened in nurseries in 1985/86 and 1986/87. Seedlings raised from plants which did not become infected in the field were inoculated in the glasshouse in order to eliminate susceptible escapees. The numbers of diseased and healthy individuals in each population were subjected to χ 2 tests. In the majority of the F 2 populations a good fit was obtained for a ratio of one resistant to 15 susceptible plants, a ratio to be expected if resistance to GRV were determined by a pair of independent complementary recessive genes. This was further supported by data from backcross generations.