Utilization of Exotic Maize Germplasm

Parra, José Ron; Hallauer, Arnel R.

doi:10.1002/9780470650073.ch6

Cited by 11 publications

(13 citation statements)

References 66 publications

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“…The ability of SSR markers to identify the potential heterotic groups in maize has been well demonstrated (Enoki et al, 2002;Reif et al, 2003;Barata and Carena, 2006). The inclusion of exotic germplasm further improves the heterotic potential among groups (Beck et al, 1991;Ron-Parra and Hallauer, 1997).…”

Section: Introductionmentioning

confidence: 96%

Molecular Characterization of Exotic and Indigenous Maize Inbreds for Biofortification with Kernel Carotenoids

et al. 2015

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Maize, consumed as food and feed, possesses a number of carotenoids for which ample genetic variability exists. Two of them, lutein and zeaxanthin, function as antioxidants while β-cryptoxanthin and β-carotene serve as precursors to vitamin A in human body. We report here genetic diversity in 48 diverse maize inbreds for their utilization in the biofortification program. While there was wide genetic variation for lutein (0.36-15.75 μg/g), zeaxanthin (0.25-22.76 μg/g), and β-carotene (0.07-17.41 μg/g), low variation was observed for β-cryptoxanthin (0.06-4.37 μg/g). Fifty-eight microsatellite markers having genome-wide distribution generated a total of 225 polymorphic alleles among the inbreds. Two to seven alleles with a mean of 3.88 alleles per marker locus were detected. A total of 35 rare alleles and 11 unique alleles were obtained. The polymorphism information content ranged from 0.14 to 0.75 with an average of 0.52. Mean pair-wise genetic dissimilarity of 0.74 revealed the diverse nature of the inbreds. Neighbor-joining based clustering pattern grouped the inbreds into six major clusters. Principal coordinate analysis also depicted the diverse origin of the genotypes consistent with their pedigree. The CIMMYT-HarvestPlus bred inbreds with high kernel β-carotene concentration were genetically distant from the inbreds of Indian origin. Based on genetic distance and carotenoid concentration, potential heterotic combinations have been identified for biofortification of lutein and zeaxanthin. The CIMMYT-HarvestPlus inbreds with high β-carotene can serve as potential donors of β-carotene hydroxylase (crtRB1) favorable allele for introgression into Indian maize inbreds through marker-assisted selection.

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Section: Introductionmentioning

confidence: 96%

Molecular Characterization of Exotic and Indigenous Maize Inbreds for Biofortification with Kernel Carotenoids

et al. 2015

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“…Generally, two heterotic groups were classified within CMLs, i.e., the “A” group is dent kernel type and “B” group is flint kernel type. CIMMYT CMLs are widely used by public and private institutions worldwide, especially in developing countries (Ron Parra and Hallauer 1997 ; Warburton et al 2002 ). From 1984 to 2003, CIMMYT developed and released 539 CMLs, which may well represent the total genetic diversity of improved tropical maize germplasm due to their wide distribution and great contribution to tropical maize breeding improvement.…”

Section: Introductionmentioning

confidence: 99%

Molecular characterization of CIMMYT maize inbred lines with genotyping-by-sequencing SNPs

et al. 2016

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Key messageMolecular characterization information on genetic diversity, population structure and genetic relationships provided by this research will help maize breeders to better understand how to utilize the current CML collection.AbstractCIMMYT maize inbred lines (CMLs) have been widely used all over the world and have contributed greatly to both tropical and temperate maize improvement. Genetic diversity and population structure of the current CML collection and of six temperate inbred lines were assessed and relationships among all lines were determined with genotyping-by-sequencing SNPs. Results indicated that: (1) wider genetic distance and low kinship coefficients among most pairs of lines reflected the uniqueness of most lines in the current CML collection; (2) the population structure and genetic divergence between the Temperate subgroup and Tropical subgroups were clear; three major environmental adaptation groups (Lowland Tropical, Subtropical/Mid-altitude and Highland Tropical subgroups) were clearly present in the current CML collection; (3) the genetic diversity of the three Tropical subgroups was similar and greater than that of the Temperate subgroup; the average genetic distance between the Temperate and Tropical subgroups was greater than among Tropical subgroups; and (4) heterotic patterns in each environmental adaptation group estimated using GBS SNPs were only partially consistent with patterns estimated based on combining ability tests and pedigree information. Combining current heterotic information based on combining ability tests and the genetic relationships inferred from molecular marker analyses may be the best strategy to define heterotic groups for future tropical maize improvement. Information resulting from this research will help breeders to better understand how to utilize all the CMLs to select parental lines, replace testers, assign heterotic groups and create a core set of breeding germplasm.

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“…;CIMMYT, 1992). U. S. breeding programs will benefit from the heterosis, inbreeding, and combining ability information from CIMMYT germplasm (Parra and Hallauer, 1997). More informed decisions can be made when choosing exotic germplasm to incorporate into temperate breeding programs (Hallauer, 1978;Goodman, 1985).…”

Section: Literature Reviewmentioning

confidence: 99%

Conversion of elite subtropical maize germplasm to temperate environments

Caton¹

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Utilization of Exotic Maize Germplasm

Cited by 11 publications

References 66 publications

Molecular Characterization of Exotic and Indigenous Maize Inbreds for Biofortification with Kernel Carotenoids

Molecular Characterization of Exotic and Indigenous Maize Inbreds for Biofortification with Kernel Carotenoids

Molecular characterization of CIMMYT maize inbred lines with genotyping-by-sequencing SNPs

Conversion of elite subtropical maize germplasm to temperate environments

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