Abstract
It has been reported that seven backcrosses are required to transfer a major allele for resistance to Phytophthora rot, caused by Phytophthora megasperma Drechs. f. sp. glycinea Kuan and Erwin, in soybean [ Glycine max (L.) Merr.]. Recently, fewer backcrosses have been used successfully to transfer an allele for resistance to P. megasperma into soybean cultivars. To resolve the difference between the reported research and the practical experience of soybean breeders, this study was conducted to determine in what backcross generation a bulk of phenotypically similar, P. megasperma ‐resistant lines will provide the same yield as that of the recurrent parent. The dominant allele Rps1‐k , conferring resistance to specific races of P. megasperma , was transferred from ‘Williams 82’ into two high‐yielding, susceptible genotypes, A78‐123018 and ‘Cumberland’. Thirty‐six random resistant lines from each of five backcross generations of the two populations were evaluated for yield, maturity, lodging, and height in three Iowa environments. On average, 75% of the BC 0 ‐derived lines did not differ significantly from the recurrent parent in yield. The BC 1 generation had an average yield equivalent to that of the recurrent parent. The results indicated that, if the donor and recurrent parents differ in yield by 10% or less, one backcross is sufficient to develop a population in which homozygous resistant, phenotypically similar lines can be bulked to replace the recurrent parent.
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Claims 3
Claim · model-written summary
On average, 75% of BC0-derived resistant soybean lines did not differ significantly from the recurrent parent in yield.
- Taxon
- Soybean
Glycine maxt0 - Outcome
- yielde1
- Direction
- no_changeinferrede1
- Value
- 75%e1
- Comparator
- recurrent parente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phytophthora Rot in Soybean”
e1“On average, 75% of the BC 0 ‐derived lines did not differ significantly from the recurrent parent in yield”
Claim · model-written summary
The BC1 generation of resistant soybean lines had an average yield equivalent to the recurrent parent.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- BC 1 generatione2
- Outcome
- average yielde2
- Direction
- no_changeinferrede2
- Comparator
- recurrent parente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phytophthora Rot in Soybean”
e2“The BC 1 generation had an average yield equivalent to that of the recurrent parent”
Claim · model-written summary
One backcross is sufficient to develop soybean lines for bulking when donor and recurrent parents differ in yield by 10% or less.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- one backcross is sufficiente3
- Qualifier
- if the donor and recurrent parents differ in yield by 10% or lesse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phytophthora Rot in Soybean”
e3“if the donor and recurrent parents differ in yield by 10% or less, one backcross is sufficient to develop a population in which homozygous resistant, phenotypically similar lines can be bulked to replace the recurrent parent”