Heterosis and Inbreeding Depression in Two Soybean Single Crosses

Burton, J. W.; Brownie, Cavell

doi:10.2135/cropsci2006.03.0156

Cited by 37 publications

(43 citation statements)

References 35 publications

(44 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In fact, comparative genotyping of maize recombinant inbred lines has identified excess residual heterozygosity maintained in the highly diverse pericentromeric regions (Gore et al, 2009;McMullen et al, 2009), which have been presumably maintained due to phenotypic advantages. Soybean also exhibits heterosis (Palmer et al, 2001;Burton and Brownie, 2006); thus, early selections during the breeding process may preferentially maintain lines with greater heterozygosity, as these lines would exhibit phenotypic superiority. Preferential maintenance of heterozygous loci would result in more segregating loci during the seed increase generations, ultimately leading to greater than expected rates of intracultivar heterogeneity among individuals.…”

Section: Selection and Intracultivar Heterogeneitymentioning

confidence: 99%

The Composition and Origins of Genomic Variation among Individuals of the Soybean Reference Cultivar Williams 82

et al. 2010

View full text Add to dashboard Cite

Soybean (Glycine max) is a self-pollinating species that has relatively low nucleotide polymorphism rates compared with other crop species. Despite the low rate of nucleotide polymorphisms, a wide range of heritable phenotypic variation exists. There is even evidence for heritable phenotypic variation among individuals within some cultivars. Williams 82, the soybean cultivar used to produce the reference genome sequence, was derived from backcrossing a Phytophthora root rot resistance locus from the donor parent Kingwa into the recurrent parent Williams. To explore the genetic basis of intracultivar variation, we investigated the nucleotide, structural, and gene content variation of different Williams 82 individuals. Williams 82 individuals exhibited variation in the number and size of introgressed Kingwa loci. In these regions of genomic heterogeneity, the reference Williams 82 genome sequence consists of a mosaic of Williams and Kingwa haplotypes. Genomic structural variation between Williams and Kingwa was maintained between the Williams 82 individuals within the regions of heterogeneity. Additionally, the regions of heterogeneity exhibited gene content differences between Williams 82 individuals. These findings show that genetic heterogeneity in Williams 82 primarily originated from the differential segregation of polymorphic chromosomal regions following the backcross and single-seed descent generations of the breeding process. We conclude that soybean haplotypes can possess a high rate of structural and gene content variation, and the impact of intracultivar genetic heterogeneity may be significant. This detailed characterization will be useful for interpreting soybean genomic data sets and highlights important considerations for research communities that are developing or utilizing a reference genome sequence.

show abstract

Section: Selection and Intracultivar Heterogeneitymentioning

confidence: 99%

The Composition and Origins of Genomic Variation among Individuals of the Soybean Reference Cultivar Williams 82

et al. 2010

View full text Add to dashboard Cite

show abstract

“…This has resulted in 75% of the genes having more than one copy, with most showing differential expression (Roulin et al, 2013). Burton and Brownie (2006) suggested that yield heterosis in the F 1 and F 2 generations of crosses between two soybean inbred lines may be due to gene complementation and/or a greater number of duplicate genes favorable for higher yields Burton and Brownie (2006) suggested that yield heterosis in the F 1 and F 2 generations of crosses between two soybean inbred lines may be due to gene complementation and/or a greater number of duplicate genes favorable for higher yields…”

mentioning

confidence: 99%

Heterosis and Genetic Variance in Soybean Recombinant Inbred Line Populations

2016

Self Cite

View full text Add to dashboard Cite

One of the greatest challenges in plant breeding is the selection of parental combinations that will produce progeny that are superior to either parent. The objective of this research was to determine if yield heterosis in the F2 bulk of a soybean [Glycine max (L.) Merr.] single cross is a predictor of significant genetic variance for yield and superior line yields among random inbred lines derived from the F2 generation. In one experiment, thirty‐seven F6:7 inbred lines from each of five bi‐parental populations along with parents and the bulk F2 generation were yield tested at three locations. Of the five populations, three had significant genotypic variance for yield. The only two transgressive segregating lines came from the population with the greatest genotypic variation for yield and the only one with mid‐parent F2 yield heterosis (15% at P > 0.06). In another experiment, random inbred lines were derived from four single crosses chosen from a seven parent half diallel cross with similar mid‐parent yields. Two exhibited F2 yield heterosis and two did not. Derived F5:6 lines were yield tested in three environments. After adjustment for maturity, both populations derived from the non‐heterotic crosses had zero genetic variation. Genetic variance estimates for the two populations derived from heterotic crosses were larger than their standard errors and significant at P > Z = 0.07 and P > Z = 0.05. These experiments provide evidence that F2 bulk heterosis can be a predictor of significant genetic variation among inbred soybean lines derived from a single cross.

show abstract

“…Thorne and Fehr (1970) suggested epistatic effects in soybean to be responsible for heterosis. Burton and Brownie (2006) suggested gene complementation, linked dominant alleles. or overdominance as the possible genetic basis for heterosis in soybean.…”

Section: Discussionmentioning

confidence: 99%

Selection ofGongronema latifoliaHybrids Exhibiting Heterosis for Certain Vitamins and Lycopene

Agbo

Silva

Aleke

2011

Journal of Crop Improvement

View full text Add to dashboard Cite

Heterosis increases the productivity of a crop. Gongronema latifolia has very few and scanty records of heterosis studies and known levels of vitamin contents because it has been harvested from the wild and has a long gestation period of 14-16 months; thus, manual cross-pollination could be difficult in the species. This study was therefore undertaken to determine the levels of certain vitamins and lycopene in genotypes of Gongronema latifolia and to estimate heterosis for the traits across two years. Stem cuttings of five parent plants and their resulting hybrids were established in a field in a randomized complete block design in 2008. Young leaves from these genotypes were harvested and used to determine the levels of vitamins and lycopene and to estimate heterosis in 2009 and 2010. Better parent heterosis (BPH) ranged from −90% to 203% in both years. All vitamins and lycopene, with the exception of Vitamin C, showed positive heterosis in a minimum of five cross combinations. Vitamin E showed the highest BPH of 109% in 2009. Vitamin C had a BPH of 65% in 2010. Vitamin A, on the other hand, had a lower BPH of 52% in 2009. Two hybrids, ENS-8-MBU × AKS-33-EKPENE EDIENE and IMS-20-NJIABA × AKS-33-EKPENE EDIENE, com-plemented each other by exhibiting heterosis for the determined vitamins and lycopene. Selection of two hybrids with a higher level of vitamins and lycopene than in the parents should improve the availability of these nutrients, eventually at a commercial level.

show abstract

Heterosis and Inbreeding Depression in Two Soybean Single Crosses

Cited by 37 publications

References 35 publications

The Composition and Origins of Genomic Variation among Individuals of the Soybean Reference Cultivar Williams 82

The Composition and Origins of Genomic Variation among Individuals of the Soybean Reference Cultivar Williams 82

Heterosis and Genetic Variance in Soybean Recombinant Inbred Line Populations

Selection ofGongronema latifoliaHybrids Exhibiting Heterosis for Certain Vitamins and Lycopene

Contact Info

Product

Resources

About