Data/hora: 19/06/2024 17:06:04

Biblioteca(s): | Embrapa Cerrados; Embrapa Gado de Corte; Embrapa Pecuária Sudeste.
Data corrente: | 06/11/2023
Data da última atualização: | 06/11/2023
Autoria: | MORAES, A. da C. L.; MOLLINARI, M.; FERREIRA, R. C. U.; AONO, A.; LARA, L. A. de C.; PESSOA FILHO, M. A. C. de P.; BARRIOS, S. C. L.; GARCIA, A. A. F.; VALLE, C. B. do; SOUZA, A. P. de; VIGNA, B. B. Z.
Afiliação: | ALINE DA COSTA LIMA MORAES, UNIVERSIDADE DE CAMPINAS; MARCELO MOLLINARI, NORTH CAROLINA STATE UNIVERSITY; REBECCA CAROLINE ULBRICHT FERREIRA, UNIVERSIDADE DE CAMPINAS; ALEXANDRE AONO, UNIVERSIDADE DE CAMPINAS; LETÍCIA APARECIDA DE CASTRO LARA, UNIVERSIDADE DE SÃO PAULO; MARCO AURÉLIO CALDAS DE PINHO PESSO, CPAC; SANZIO CARVALHO LIMA BARRIOS, CNPGC; ANTONIO AUGUSTO FRANCO GARCIA, UNIVERSIDADE DE SÃO PAULO; CACILDA BORGES DO VALLE, CNPGC; ANETE PEREIRA DE SOUZA, UNIVERSIDADE DE CAMPINAS; BIANCA BACCILI ZANOTTO VIGNA, CPPSE.
Título: | Advances in genomic characterization of Urochloa humidicola: exploring polyploid inheritance and apomixis.
Ano de publicação: | 2023
Fonte/Imprenta: | Theoretical and Applied Genetics, v. 136, n. 11, 2023.
Páginas: | 17 p.
DOI: | https://doi.org/10.1007/s00122-023-04485-w
Idioma: | Inglês
Conteúdo: | Tropical forage grasses are an important food source for animal feeding, with Urochloa humidicola, also known as Koronivia grass, being one of the main pasture grasses for poorly drained soils in the tropics. However, genetic and genomic resources for this species are lacking due to its genomic complexity, including high heterozygosity, evidence of segmental allopolyploidy, and reproduction by apomixis. These complexities hinder the application of marker-assisted selection (MAS) in breeding programs. Here, we developed the highest-density linkage map currently available for the hexaploid tropical forage grass U. humidicola. This map was constructed using a biparental F1 population generated from a cross between the female parent H031 (CIAT 26146), the only known sexual genotype for the species, and the apomictic male parent H016 (BRS cv. Tupi). The linkage analysis included 4873 single nucleotide polymorphism (SNP) markers with allele dosage information. It allowed mapping of the ASGR locus and apospory phenotype to linkage group 3, in a region syntenic with chromosome 3 of Urochloa ruziziensis and chromosome 1 of Setaria italica. We also identified hexaploid haplotypes for all individuals, assessed the meiotic configuration, and estimated the level of preferential pairing in parents during the meiotic process, which revealed the autopolyploid origin of sexual H031 in contrast to apomictic H016, which presented allopolyploid behavior in preferential pairing analysis. These results provide new information regarding the genetic organization, mode of reproduction, and allopolyploid origin of U. humidicola, potential SNPs markers associated with apomixis for MAS and resources for research on polyploids and tropical forage grasses.
Thesaurus Nal: | Animal feeding; Forage grasses; Plant breeding; Polyploidy; Urochloa humidicola.

Categoria do assunto:

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G Melhoramento Genético

Registro original: | Embrapa Cerrados (CPAC)

Exemplares:

CPAC - (37651-1) - UPC - AP - DD -  -  -  - DIS
CPPSE - (26216-1) - UPC - AP - DD - PROCI-2023.00083 - MOR - 2023.00251 - DIS
CNPGC - (17931-1) - UPC - AP - DD -  -  -  - DIS