Premium
Inheritance of Reaction to Race 4 of Soybean‐cyst Nematode 1
Author(s) -
Thomas J. D.,
Caviness C. E.,
Riggs R. D.,
Hartwig E. E.
Publication year - 1975
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/cropsci1975.0011183x001500020020x
Subject(s) - soybean cyst nematode , biology , heterodera , backcrossing , locus (genetics) , allele , genetics , cultivar , glycine , pi , nematode , gene , botany , biochemistry , amino acid , ecology
Five soybean ( Glycine max L. Merr.) crosses involving parents that differed in reaction to race 4 of soybean‐cyst nematode (SCN) ( Heterodera glycines Ichinohe) were studied in F 1 , F 2 , and backcross populations. Reaction of the parents to race 4 was: PI 88788, resistant; PI 90763, moderately resistant; ‘Peking,’ susceptible; ‘Mack’ and ‘Hill,’ very susceptible. Frequency distributions from three crosses involving parents that were resistant, moderately resistant, and susceptible indicated that three alleles at a single locus conditioned reaction to SCN. Resistance possessed by PI 88788 was recessive to PI 90763 and the moderately resistant reaction of PI 90763 was recessive to the suceptible Peking cultivar. Backcross data also appeared to confirm this inheritance pattern. Segregation in the F 2 generation gave a good fit for a ratio of three resistant and 61 susceptible plants from two crosses; Hill ✕ PI 90763 and Mack ✕ PI 90763 which involved very susceptible and moderately resistant parents. This ratio indicated one dominant and two recessive genes conditioned resistance in these crosses. Apparently two additional loci with two alleles at each locus, also are necessary for resistance to race 4.