Predicted genetic gains from introgressing chromosome segments from exotic germplasm into an elite soybean cultivar

AbstractBroadening the diversity of cultivated soybean [Glycine max (L.) Merrill] through introgression of exotic germplasm has been difficult. Our objectives were to 1) determine if introgressing specific chromosome segments (instead of quantitative trait locus alleles) from exotic soybean germplasm has potential for improving an elite cultivar, and 2) identify strategies to introgress and pyramid exotic chromosome segments into an elite cultivar. We estimated genomewide marker effects for yield and other traits in seven crosses between the elite line IA3023 and seven soybean plant introductions (PIs). We then predicted genetic gains from having ≤2 targeted recombinations per linkage group. When introgression was modeled for yield while controlling maturity in the seven PI × IA3023 populations, the predicted yield was 8 to 25% over the yield of IA3023. Correlated changes in maturity, seed traits, lodging, and plant height were generally small but were in the favorable direction. In contrast, selecting the best recombinant inbred (without targeted recombination) in each of the PI × IA3023 populations led to negative or minimal yield gains over IA3023. In one PI × IA3023 population, introgressing and pyramiding only two linkage groups from recombinant inbreds into IA3023 was predicted to achieve an 8% yield gain over IA3023 without sacrificing the performance of other traits. The probability of inheriting intact chromosomes was high enough to allow introgression and pyramiding of chromosome segments in 5-6 generations. Overall, our study suggested that introgressing specific chromosome segments is an effective way to introduce exotic soybean germplasm into an elite cultivar.Key messageTo improve an elite soybean line, introgress longer chromosome segments instead of QTL alleles from exotic germplasm.

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Quality and Physicochemical Characteristics with Different Seeding Periods of Sprout-Soybean Cultivar Cultivated in the North-Central Region

Journal of the Korean Society of Food Science and Nutrition ◽

10.3746/jkfn.2018.47.12.1301 ◽

2018 ◽

Vol 47 (12) ◽

pp. 1301-1311

Author(s):

Gun Ho Jung ◽

Hyun-Joo Kim ◽

Ji Hae Lee ◽

Byong Won Lee ◽

Yu Young Lee ◽

...

Keyword(s):

Central Region ◽

Physicochemical Characteristics ◽

Soybean Cultivar ◽

North Central Region ◽

North Central ◽

The North

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Comparative Proteomics Analysis of Developing Seed of a Pre-Harvest Seed Deterioration Resistant Soybean Cultivar Under High Temperature and Humidity Stress

Current Proteomics ◽

10.2174/157016461203151120093653 ◽

2015 ◽

Vol 12 (3) ◽

pp. 168-184 ◽

Cited By ~ 2

Author(s):

Hao Ma ◽

Liqun Wang ◽

Shuang Wang ◽

Jiaping Wei ◽

Liyan Huang ◽

...

Keyword(s):

High Temperature ◽

Comparative Proteomics ◽

Soybean Cultivar ◽

Proteomics Analysis ◽

Seed Deterioration ◽

Developing Seed ◽

Temperature And Humidity

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18S rDNA mapping revealed conservation and rearrangements of chromosome segments in two Channa species

Proceedings of the National Academy of Sciences India Section B Biological Sciences ◽

10.1007/s40011-021-01257-8 ◽

2021 ◽

Author(s):

Basdeo Kushwaha ◽

Vishwamitra Singh Baisvar ◽

Ravindra Kumar

Keyword(s):

18S Rdna ◽

Chromosome Segments

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Trends in genetic diversity and the effect of inbreeding in American Angus cattle under genomic selection

Genetics Selection Evolution ◽

10.1186/s12711-021-00644-z ◽

2021 ◽

Vol 53 (1) ◽

Author(s):

Emmanuel A. Lozada-Soto ◽

Christian Maltecca ◽

Duc Lu ◽

Stephen Miller ◽

John B. Cole ◽

...

Keyword(s):

Genetic Diversity ◽

Beef Cattle ◽

Genomic Selection ◽

Inbreeding Depression ◽

Growth Traits ◽

Effective Population ◽

Angus Cattle ◽

Genomic Inbreeding ◽

Chromosome Segments ◽

The Impact

Abstract Background While the adoption of genomic evaluations in livestock has increased genetic gain rates, its effects on genetic diversity and accumulation of inbreeding have raised concerns in cattle populations. Increased inbreeding may affect fitness and decrease the mean performance for economically important traits, such as fertility and growth in beef cattle, with the age of inbreeding having a possible effect on the magnitude of inbreeding depression. The purpose of this study was to determine changes in genetic diversity as a result of the implementation of genomic selection in Angus cattle and quantify potential inbreeding depression effects of total pedigree and genomic inbreeding, and also to investigate the impact of recent and ancient inbreeding. Results We found that the yearly rate of inbreeding accumulation remained similar in sires and decreased significantly in dams since the implementation of genomic selection. Other measures such as effective population size and the effective number of chromosome segments show little evidence of a detrimental effect of using genomic selection strategies on the genetic diversity of beef cattle. We also quantified pedigree and genomic inbreeding depression for fertility and growth. While inbreeding did not affect fertility, an increase in pedigree or genomic inbreeding was associated with decreased birth weight, weaning weight, and post-weaning gain in both sexes. We also measured the impact of the age of inbreeding and found that recent inbreeding had a larger depressive effect on growth than ancient inbreeding. Conclusions In this study, we sought to quantify and understand the possible consequences of genomic selection on the genetic diversity of American Angus cattle. In both sires and dams, we found that, generally, genomic selection resulted in decreased rates of pedigree and genomic inbreeding accumulation and increased or sustained effective population sizes and number of independently segregating chromosome segments. We also found significant depressive effects of inbreeding accumulation on economically important growth traits, particularly with genomic and recent inbreeding.

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Photosynthetic organs contributions to grain yield genetic gains in Chilean winter wheat

Agronomy Journal ◽

10.1002/agj2.20718 ◽

2021 ◽

Author(s):

Abdelhalim Elazab ◽

Felipe Moraga ◽

Alejandro del Pozo

Keyword(s):

Winter Wheat ◽

Grain Yield ◽

Genetic Gains

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Alien introgression and morpho-agronomic characterization of diploid progenies of Solanum lycopersicoides monosomic alien addition lines (MAALs) toward pre-breeding applications in tomato (S. lycopersicum)

Theoretical and Applied Genetics ◽

10.1007/s00122-020-03758-y ◽

2021 ◽

Author(s):

Puneet Kaur Mangat ◽

Junghyun Shim ◽

Ritchel B. Gannaban ◽

Joshua J. Singleton ◽

Rosalyn B. Angeles-Shim

Keyword(s):

Chromosome Complement ◽

Introgression Lines ◽

Addition Lines ◽

Solanum Lycopersicoides ◽

Drought Tolerant ◽

Use Efficiency ◽

Tomato Breeding ◽

Chromosome Segments ◽

Alien Addition Lines

Abstract Key message Alien introgressions that were captured in the genome of diploid plants segregating from progenies of monosomic alien addition lines of S. lycopersicoides confer novel phenotypes with commercial and agronomic value in tomato breeding. Abstract Solanum lycopersicoides is a wild relative of tomato with a natural adaptation to a wide array of biotic and abiotic challenges. In this study, we identified and characterized diploid plants segregating from the progenies of monosomic alien addition lines (MAALs) of S. lycopersicoides to establish their potential as donors in breeding for target trait improvement in tomato. Molecular genotyping identified 28 of 38 MAAL progenies having the complete chromosome complement of the cultivated tomato parent and limited chromosome introgressions from the wild S. lycopersicoides parent. Analysis of SSR and indel marker profiles identified 34 unique alien introgressions in the 28 MAAL-derived introgression lines (MDILs) in the genetic background of tomato. Conserved patterns of alien introgressions were detected among sibs of MDILs 2, 3, 4 and 8. Across MDILs, a degree of preferential transmission of specific chromosome segments was also observed. Morphologically, the MDILs closely resembled the cultivated tomato more than S. lycopersicoides. The appearance of novel phenotypes in the MDILs that are lacking in the cultivated parent or the source MAALs indicates the capture of novel genetic variation by the diploid introgression lines that can add commercial and agronomic value to tomato. In particular, screening of representative MDILs for drought tolerance at the vegetative stage identified MDIL 2 and MDIL 11III as drought tolerant based on visual scoring. A regulated increase in stomatal conductance of MDIL 2 under drought stress indicates better water use efficiency that allowed it to survive for 7 days under 0% moisture level.

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Hidden Effects of X Chromosome Introgressions on Spermatogenesis in Drosophila simulans × D. mauritiana Hybrids Unveiled by Interactions Among Minor Genetic Factors

Genetics ◽

10.1093/genetics/150.2.745 ◽

1998 ◽

Vol 150 (2) ◽

pp. 745-754 ◽

Cited By ~ 3

Author(s):

Xulio R Maside ◽

José P Barral ◽

Horacio F Naveira

Keyword(s):

Male Sterility ◽

X Chromosome ◽

Seminal Vesicles ◽

Genetic Dissection ◽

Research Strategies ◽

Hybrid Male ◽

Hybrid Male Sterility ◽

Epistatic Interactions ◽

Drosophila Mauritiana ◽

Chromosome Segments

Abstract One of the most frequent outcomes of interspecific hybridizations in Drosophila is hybrid male sterility. Genetic dissection of this reproductive barrier has revealed that the number of responsible factors is very high and that these factors are frequently engaged in complex epistatic interactions. Traditionally, research strategies have been based on contrasting introgressions of chromosome segments that produce male sterility with those that allow fertility. Few studies have investigated the phenotypes associated with the boundary between fertility and sterility. In this study, we cointrogressed three different X chromosome segments from Drosophila mauritiana into D. simulans. Hybrid males with these three segments are usually fertile, by conventional fertility assays. However, their spermatogenesis shows a significant slowdown, most manifest at lower temperatures. Each of the three introgressed segments retards the arrival of sperm to the seminal vesicles. Other small disturbances in spermatogenesis are evident, which altogether lead to an overall reduction in the amount of motile sperm in their seminal vesicles. These results suggest that a delay in the timing of spermatogenesis, which might be brought about by the cumulative action of many different factors of minor segment, may be the primary cause of hybrid male sterility.

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