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10.3390/plants13030336
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Article

Genetic Diversity within a Collection of Italian Maize Inbred Lines: A Resource for Maize Genomics and Breeding

by
Anna Maria Mastrangelo
1,*,
Hans Hartings
2,
Chiara Lanzanova
2,
Carlotta Balconi
2,
Sabrina Locatelli
2,
Helga Cassol
2,
Paolo Valoti
2,
Giuseppe Petruzzino
1 and
Nicola Pecchioni
1,2
1
CREA-Centro di Ricerca Cerealicoltura e Colture Industriali/Research Centre for Cereal and Industrial Crops, SS 673 Metri 25200, 71122 Foggia, Italy
2
CREA-Centro di Ricerca Cerealicoltura e Colture Industriali/Research Centre for Cereal and Industrial Crops, Via Stezzano 24, 24126 Bergamo, Italy
*
Author to whom correspondence should be addressed.
Plants 2024, 13(3), 336; https://doi.org/10.3390/plants13030336
Submission received: 11 October 2023 / Revised: 16 January 2024 / Accepted: 17 January 2024 / Published: 23 January 2024
(This article belongs to the Section Plant Genetic Resources)
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Abstract

Genetic diversity is fundamental for studying the complex architecture of the traits of agronomic importance, controlled by major and minor loci. Moreover, well-characterized germplasm collections are essential tools for dissecting and analyzing genetic and phenotypic diversity in crops. A panel of 360 entries, a subset of a larger collection maintained within the GenBank at CREA Bergamo, which includes the inbreds derived from traditional Italian maize open-pollinated (OP) varieties and advanced breeding ones (Elite Inbreds), was analyzed to identify SNP markers using the tGBS® genotyping-by-sequencing technology. A total of 797,368 SNPs were found during the initial analysis. Imputation and filtering processes were carried out based on the percentage of missing data, redundant markers, and rarest allele frequencies, resulting in a final dataset of 15,872 SNP markers for which a physical map position was identified. Using this dataset, the inbred panel was characterized for linkage disequilibrium (LD), genetic diversity, population structure, and genetic relationships. LD decay at a genome-wide level indicates that the collection is a suitable resource for association mapping. Population structure analyses, which were carried out with different clustering methods, showed stable grouping statistics for four groups, broadly corresponding to ‘Insubria’, ‘Microsperma’, and ‘Scagliolino’ genotypes, with a fourth group composed prevalently of elite accessions derived from Italian and US breeding programs. Based on these results, the CREA Italian maize collection, genetically characterized in this study, can be considered an important tool for the mapping and characterization of useful traits and associated loci/alleles, to be used in maize breeding programs.
Keywords: maize; germplasm collections; genetic diversity maize; germplasm collections; genetic diversity

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MDPI and ACS Style

Mastrangelo, A.M.; Hartings, H.; Lanzanova, C.; Balconi, C.; Locatelli, S.; Cassol, H.; Valoti, P.; Petruzzino, G.; Pecchioni, N. Genetic Diversity within a Collection of Italian Maize Inbred Lines: A Resource for Maize Genomics and Breeding. Plants 2024, 13, 336. https://doi.org/10.3390/plants13030336

AMA Style

Mastrangelo AM, Hartings H, Lanzanova C, Balconi C, Locatelli S, Cassol H, Valoti P, Petruzzino G, Pecchioni N. Genetic Diversity within a Collection of Italian Maize Inbred Lines: A Resource for Maize Genomics and Breeding. Plants. 2024; 13(3):336. https://doi.org/10.3390/plants13030336

Chicago/Turabian Style

Mastrangelo, Anna Maria, Hans Hartings, Chiara Lanzanova, Carlotta Balconi, Sabrina Locatelli, Helga Cassol, Paolo Valoti, Giuseppe Petruzzino, and Nicola Pecchioni. 2024. "Genetic Diversity within a Collection of Italian Maize Inbred Lines: A Resource for Maize Genomics and Breeding" Plants 13, no. 3: 336. https://doi.org/10.3390/plants13030336

APA Style

Mastrangelo, A. M., Hartings, H., Lanzanova, C., Balconi, C., Locatelli, S., Cassol, H., Valoti, P., Petruzzino, G., & Pecchioni, N. (2024). Genetic Diversity within a Collection of Italian Maize Inbred Lines: A Resource for Maize Genomics and Breeding. Plants, 13(3), 336. https://doi.org/10.3390/plants13030336

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