Quantitative Genetics in Maize Breeding

Carena, M. J.; Hallauer, Arnel R.; Filho, J. B. Miranda

doi:10.1007/978-1-4419-0766-0

Cited by 227 publications

(276 citation statements)

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“…Maize inbred development through the world has been accomplished in many different ways, but some of the most common procedures consist of intermating existing elite materials or incorporating a desirable trait from a donor into an elite inbred line through backcross breeding [20]. Thus, we expected that a high number of the inbred lines in our collection would be closely related.…”

Section: Resultsmentioning

confidence: 99%

Comprehensive genotyping of the USA national maize inbred seed bank

et al. 2013

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BackgroundGenotyping by sequencing, a new low-cost, high-throughput sequencing technology was used to genotype 2,815 maize inbred accessions, preserved mostly at the National Plant Germplasm System in the USA. The collection includes inbred lines from breeding programs all over the world.ResultsThe method produced 681,257 single-nucleotide polymorphism (SNP) markers distributed across the entire genome, with the ability to detect rare alleles at high confidence levels. More than half of the SNPs in the collection are rare. Although most rare alleles have been incorporated into public temperate breeding programs, only a modest amount of the available diversity is present in the commercial germplasm. Analysis of genetic distances shows population stratification, including a small number of large clusters centered on key lines. Nevertheless, an average fixation index of 0.06 indicates moderate differentiation between the three major maize subpopulations. Linkage disequilibrium (LD) decays very rapidly, but the extent of LD is highly dependent on the particular group of germplasm and region of the genome. The utility of these data for performing genome-wide association studies was tested with two simply inherited traits and one complex trait. We identified trait associations at SNPs very close to known candidate genes for kernel color, sweet corn, and flowering time; however, results suggest that more SNPs are needed to better explore the genetic architecture of complex traits.ConclusionsThe genotypic information described here allows this publicly available panel to be exploited by researchers facing the challenges of sustainable agriculture through better knowledge of the nature of genetic diversity.

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Section: Resultsmentioning

confidence: 99%

Comprehensive genotyping of the USA national maize inbred seed bank

et al. 2013

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“…2) two respective groups and gene pools (Table 4), with each pool exhibiting large molecular genetic variation. The history of maize hybrid breeding (Hallauer et al, 2010) shows that maize breeding gradually entered into classical hybrid breeding from observations made on population hybrids (introgression of Northern Flints and Southern Dents), and the population hybrid variety concept in maize is still worth investigating for certain agriculture sectors (Carena, 2005). This has been the basis of maize hybrid breeding (Hallauer et al, 2010) and the first step in hybrid breeding for many other crops (Melchinger and Gumber, 1998).…”

Section: Discussionmentioning

confidence: 99%

Gene Pool Subdivision of East African Sweetpotato Parental Material

et al. 2018

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Sweetpotato [Ipomoea batatas (L.) Lam] breeding is important for food security and health in East Africa (EA), and a breeding platform in Uganda provides national researchers and breeders in EA with true seed. Our objectives were to characterize genetic relationships among parental material used at the EA breeding platform. There were 135 parents and six check clones analyzed using 31 simple sequence repeat primers. An average of 7.13 alleles per primer was found, and Jaccard similarity coefficients were in the range of 0.298 to 1.00 with a mean of 0.542. Unweighted pair group cluster analysis placed most African parents in two main subclusters showing no association with morphology or geographical origin. The subclusters were also supported by principal coordinate analysis, derivative analysis of principal components, and population structure simulations. The analyzed breeding material from EA was highly genetically variable, grouped in two distinct genetic pools, and suitable to study heterosis exploiting breeding schemes.

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“…The experimental layout was a randomized block design with three replications (15 plants per replication). With the aim of both increasing the precision of the experiment and controlling the experimental error, families sharing at least one parent were included in the same set, and replications were nested within sets (Hallauer et al, 2010). After four months, tubers were individually harvested, and the production of each plant was identified and temporarily stored in cold dark conditions.…”

Section: Materials An D Methodsmentioning

confidence: 99%

Genetic analyses for bioactive potential in tetraploid potato (Solanum tuberosum L.)

Tierno

Galarreta

2018

Plant Breeding

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A total of four traits related to bioactive potential of the tetraploid potato were studied in a North Carolina II cross‐experiment. The objectives of this study were to estimate genetic parameters for target bioactive compounds in a tetraploid potato population, to determine phenotypic and genotypic correlations and to calculate combining ability effects of cultivars and breeding lines included in the crossing scheme. Total monomeric anthocyanins, phenolics, carotenoids and hydrophilic antioxidant capacity were measured by spectrophotometric methods. The sources of variation female (GCAf), male (GCAm) and their interaction (SCA) were significant for bioactive compounds and antioxidant capacity. Narrow‐sense heritability estimates (h2) were moderate for all the traits (0.413–0.657). Both phenotypic and genotypic correlations were highly significant for phenolic compounds and antioxidant capacity. As regards combining ability, positive and negative GCA and also SCA effects have been identified for bioactive compounds and antioxidant capacity. These results indicate that hybrid breeding lines can be obtained by choosing parents with significant GCA, whose bioactive potential can also be further enhanced if the crosses have a significant SCA.

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Quantitative Genetics in Maize Breeding

Cited by 227 publications

References 0 publications

Comprehensive genotyping of the USA national maize inbred seed bank

Comprehensive genotyping of the USA national maize inbred seed bank

Gene Pool Subdivision of East African Sweetpotato Parental Material

Genetic analyses for bioactive potential in tetraploid potato (Solanum tuberosum L.)

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