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Inheritance in Soybean of Resistant and Necrotic Reactions to Soybean Mosaic Virus Strains
Author(s) -
Chen P.,
Buss G. R.,
Roane C. W.,
Tolin S. A.
Publication year - 1994
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/cropsci1994.0011183x003400020021x
Subject(s) - biology , soybean mosaic virus , allele , locus (genetics) , genetics , potyvirus , cultivar , gene , strain (injury) , genotype , heterozygote advantage , plant virus , virus , horticulture , anatomy
Five soybean [ Glycine max (L.) Merr.] cultivars, PI96983, ‘Ogden’, ‘York’, ‘Marshall’, and ‘Kwanggyo’, were studied to determine the inheritance of their resistant (R) or necrotic (N) reactions to soybean mosaic virus (SMV) strains G4, G5, G6, G7, and G7A. Each parent was crossed reciprocally with a susceptible (S) cultivar (‘Essex’ or ‘Lee 68’) to determine the number of genes for resistance or necrosis. The R parents were also crossed with each other to test the allelism of the genes conditioning the R or N reaction. All the F 2 populations from N × S crosses segregated in a 3:1 ratio with necrosis being dominant to susceptibility. The absence of S segregants in F 2 populations of N × N and R × R crosses and the lack of segregation in S × S crosses indicate that the single dominant genes in the five non‐susceptible parents are alleles at a common locus. All R × S crosses produced a combination of R, N, and S plants and gave a good fit to a 3(R + N):1S ratio. Two different SMV‐strain × resistance‐gene interactions were observed to produce the N reaction: (i) alleles which are necrotic to specific strains in the homozygous state are dominant to alleles which are resistant or susceptible to the same strain, (ii) alleles which are resistant in the homozygous state to a strain often exhibit necrosis when they occur in a heterozygote with a susceptible allele.