Claim · model-written summary
The unusual ratios and absence of homozygous resistant plants were attributed to close linkage of rust resistance and seedling mortality alleles.
- Taxon
- red clover
Trifolium pratensee1 - Gene
- a dominant allele conditioning rust resistance and a recessive allele causing seedling mortalitye0
- Outcome
- failure to obtain homozygous resistant genotypese0
Verbatim
e0“The unexpected genetic ratios and failure to obtain homozygous resistant genotypes were attributed to a close linkage between a dominant allele conditioning rust resistance and a recessive allele causing seedling mortality.”
e1“in a red clover ( Trifolium pratense L.) clone, KyCL 75”
Title
Monogenic Resistance to Red Clover Leaf Rust Associated with Seedling Lethality1
M. C. Engelke; R. R. Smith; D. P. Maxwell Crop Science 1977. doi:10.2135/cropsci1977.0011183x001700030031x
Other claims from this paper (7)
- Observation Equal resistant and susceptible segregation in F1 indicated that L12 was homozygous recessive for rust susceptibility.
- Observation Intercrossing resistant F1 plants gave F2 segregation of 2 resistant to 1 susceptible rather than 3:1.
- Observation Backcrossing resistant F1 plants to the resistant parent gave BC segregation of 2 resistant to 1 susceptible rather than 3:1.
- Observation Intercrossed susceptible F1 plants produced only susceptible progeny.
- Observation Resistant plants selected from F2 and BC populations yielded leaf-rust segregation after backcrossing to susceptible L12.
- Observation Homozygous resistant plants die as seedlings.
- Recommendation KyCL 75 rust resistance cannot be used to develop a resistant red clover cultivar unless the linkage is broken.