High proportion of diploid hybrids produced by interspecific diploid × tetraploid Sorghum hybridization

Cox, Stan; Nabukalu, Pheonah; Paterson, Andrew H.; Kong, Wenqian; Auckland, Susan; Rainville, Lisa K.; Cox, Sheila; Wang, Shuwen

doi:10.1007/s10722-017-0580-7

Cited by 10 publications

(9 citation statements)

References 8 publications

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“…Long under selection for weedinessrelated attributes that enhance its competitiveness with crops, some US S. halepense genotypes have transitioned to nonagricultural niches (Sezen et al, 2016) and may also experience selection favoring alleles that could improve sorghum and other crops, e.g., for cold tolerance, rapid vegetative development and flowering, disease and pest resistance, and ratooning (a new growth cycle from the stubble of the prior one). Sorghum bicolor can routinely serve as the pollen parent of triploid and tetraploid (reviewed in Warwick and Black, 1983;Tang and Liang, 1988) and under some circumstances diploid (Dweikat, 2005;Cox et al, 2017), interspecific hybrids with Sh, offering the opportunity to test S. halepense alleles in sorghum.…”

Section: Discussionmentioning

confidence: 99%

The Evolution of an Invasive Plant, Sorghum halepense L. (‘Johnsongrass’)

et al. 2020

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From noble beginnings as a prospective forage, polyploid Sorghum halepense ('Johnsongrass') is both an invasive species and one of the world's worst agricultural weeds. Formed by S. bicolor x S. propinquum hybridization, we show S. halepense to have S. bicolor-enriched allele composition and striking mutations in 5,957 genes that differentiate it from representatives of its progenitor species and an outgroup. The spread of S. halepense may have been facilitated by introgression from closelyrelated cultivated sorghum near genetic loci affecting rhizome development, seed size, and levels of lutein, a photochemical protectant and abscisic acid precursor. Rhizomes, subterranean stems that store carbohydrates and spawn clonal propagules, have growth correlated with reproductive rather than other vegetative tissues, and increase survival of both temperate cold seasons and tropical dry seasons. Rhizomes of S. halepense are more extensive than those of its rhizomatous progenitor S. propinquum, with gene expression including many alleles from its non-rhizomatous S. bicolor progenitor. The first surviving polyploid in its lineage in ∼96 million years, its post-Columbian spread across six continents carried rich genetic diversity that in the United States has facilitated transition from agricultural to non-agricultural niches. Projected to spread another 200-600 km northward in the coming century, despite its drawbacks S. halepense may offer novel alleles and traits of value to improvement of sorghum.

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Section: Discussionmentioning

confidence: 99%

The Evolution of an Invasive Plant, Sorghum halepense L. (‘Johnsongrass’)

et al. 2020

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“…Although S. propinquum has also been crossed with domesticated S. bicolor to develop perennial genotypes ( Kong et al, 2013 , 2015 ), S. halepense is the preferred donor of this trait as it confers a stronger and more aggressive perenniality capable of withstanding freezing winters ( Cox et al, 2002 ). S. halepense can be hybridized either with induced tetraploids or cytoplasmic-genetic male sterile diploids of S. bicolor , originating in both cases mainly tetraploid progenies ( Piper and Kulakow, 2007 ; Nabukalu and Cox, 2016 ), although diploid descendants have also been observed ( Dweikat, 2005 ; Cox et al, 2018a ). Importantly, hybrid lines derived from S. bicolor × S. halepense crosses proved to be competitive with S. bicolor in terms of biomass production, opening up the possibility to straightforwardly develop perennial biomass sorghum cultivars ( Habyarimana et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Genome-Wide Association Study for Biomass Related Traits in a Panel of Sorghum bicolor and S. bicolor × S. halepense Populations

et al. 2020

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The efficient use of sorghum as a renewable energy source requires high biomass yields and reduced agricultural inputs. Hybridization of Sorghum bicolor with wild Sorghum halepense can help meet both requirements, generating high-yielding and environment friendly perennial sorghum cultivars. Selection efficiency, however, needs to be improved to exploit the genetic potential of the derived recombinant lines and remove weedy and other wild traits. In this work, we present the results from a Genome-Wide Association Study conducted on a diversity panel made up of S. bicolor and an advanced population derived from S. bicolor × S. halepense multi-parent crosses. The objective was to identify genetic loci controlling biomass yield and biomass-relevant traits for breeding purposes. Plants were phenotyped during four consecutive years for dry biomass yield, dry mass fraction of fresh material, plant height and plant maturity. A genotyping-by-sequencing approach was implemented to obtain 92,383 high quality SNP markers used in this work. Significant marker-trait associations were uncovered across eight of the ten sorghum chromosomes, with two main hotspots near the end of chromosomes 7 and 9, in proximity of dwarfing genes Dw1 and Dw3 . No significant marker was found on chromosomes 2 and 4. A large number of significant marker loci associated with biomass yield and biomass-relevant traits showed minor effects on respective plant characteristics, with the exception of seven loci on chromosomes 3, 8, and 9 that explained 5.2–7.8% of phenotypic variability in dry mass yield, dry mass fraction of fresh material, and maturity, and a major effect ( R 2 = 16.2%) locus on chromosome 1 for dry mass fraction of fresh material which co-localized with a zinc-finger homeodomain protein possibly involved in the expression of the D (Dry stalk) locus. These markers and marker haplotypes identified in this work are expected to boost marker-assisted selection in sorghum breeding.

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“…propinquum (2n = 20) followed by chromosome doubling [14]. It can be hybridized with either induced tetraploids or cytoplasmic-genetic male sterile diploids of cultivated sorghum, originating in both cases mainly tetraploid progenies [9,15], although diploid descendants can also occur [16,17].…”

Section: Introductionmentioning

confidence: 99%

Genome-wide association mapping of total antioxidant capacity, phenols, tannins, and flavonoids in a panel of Sorghum bicolor and S. bicolor × S. halepense populations using multi-locus models

et al. 2019

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Sorghum is widely used for producing food, feed, and biofuel, and it is increasingly grown to produce grains rich in health-promoting antioxidants. The conventional use of grain color as a proxy to indirectly select against or for antioxidants polyphenols in sorghum grain was hampered by the lack of consistency between grain color and the expected antioxidants concentration. Marker-assisted selection built upon significant loci identified through linkage disequilibrium studies showed interesting potential in several plant breeding and animal husbandry programs, and can be used in sorghum breeding for consumer-tailored antioxidant production. The purpose of this work was therefore to conduct genome-wide association study of sorghum grain antioxidants using single nucleotide polymorphisms in a novel diversity panel of Sorghum bicolor landraces and S. bicolor × S. halepense recombinant inbred lines. The recombinant inbred lines outperformed landraces for antioxidant production and contributed novel polymorphism. Antioxidant traits were highly correlated and showed very high broad-sense heritability. The genome-wide association analysis uncovered 96 associations 55 of which were major quantitative trait loci (QTLs) explaining 15 to 31% of the observed antioxidants variability. Eight major QTLs localized in novel chromosomal regions. Twenty-four pleiotropic major effect markers and two novel functional markers (Chr9_1550093, Chr10_50169631) were discovered. A novel pleiotropic major effect marker (Chr1_61095994) explained the highest proportion (R2 = 27–31%) of the variance observed in most traits evaluated in this work, and was in linkage disequilibrium with a hotspot of 19 putative glutathione S-transferase genes conjugating anthocyanins into vacuoles. On chromosome four, a hotspot region was observed involving major effect markers linked with putative MYB-bHLH-WD40 complex genes involved in the biosynthesis of the polyphenol class of flavonoids. The findings in this work are expected to help the scientific community particularly involved in marker assisted breeding for the development of sorghum cultivars with consumer-tailored antioxidants concentration.

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High proportion of diploid hybrids produced by interspecific diploid × tetraploid Sorghum hybridization

Cited by 10 publications

References 8 publications

The Evolution of an Invasive Plant, Sorghum halepense L. (‘Johnsongrass’)

The Evolution of an Invasive Plant, Sorghum halepense L. (‘Johnsongrass’)

Genome-Wide Association Study for Biomass Related Traits in a Panel of Sorghum bicolor and S. bicolor × S. halepense Populations

Genome-wide association mapping of total antioxidant capacity, phenols, tannins, and flavonoids in a panel of Sorghum bicolor and S. bicolor × S. halepense populations using multi-locus models

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