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Polyploidization and characterization of p. lenticulare and p. compressifolium accessions

Grant number: 18/07624-3
Support type:Regular Research Grants
Duration: August 01, 2018 - July 31, 2020
Field of knowledge:Biological Sciences - Genetics
Principal Investigator:Alessandra Pereira Fávero
Grantee:Alessandra Pereira Fávero
Home Institution: Pecuária Sudeste. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA). Ministério da Agricultura, Pecuária e Abastecimento (Brasil). São Carlos , SP, Brazil
Assoc. researchers: Ana Luisa Sousa Azevedo ; Anete Pereira de Souza ; Ann R. Soffes Blount ; Bianca Baccili Zanotto Vigna ; Byron L. Burson ; Camilo Luis Quarin ; Carlos Alberto Acuna ; Esteban Fernando Rios ; Francisco Espinoza ; Francisco Humberto Dübbern de Souza ; Frederico de Pina Matta ; Marcelo Mattos Cavallari ; Marcos Rafael Gusmão ; Patricia Menezes Santos ; Russell William Jessup
Associated scholarship(s):18/18691-3 - Reproductive and cytogenetic characterization and polyploidization of sexual Paspalum accessions (Plicatula group), BP.TT

Abstract

The genus Paspalum is native to America and has approximately 400 species distributed into informal groups. One of these groups is Plicatula, in which there are many species with potential forage value. Many cultivars of Plicatula species have been released for forage purposes worldwide; however, all of them were based on ecotype selection. In order to develop breeding programs within Plicatula, inducing chromosome doubling in sexual diploid species to generate sexual tetraploid plants that can be used as bridge-species in hybridizations with apomitic elite germplasm is critical. Thus, the aim of this proposal is develop sexual tetraploid plants of P. compressifolium and P. lenticulare, both from Plicatula group, characterize the progenies according the ploidy and reproductive mode, and identify apomixis-associated molecular markers. The development of Plicatula sexual tetraploid plants and the apomixis-associated molecular markers will help advance Paspalum genetic breeding for Embrapa Southeast Livestock. It will not be possible to make crosses due to ploidy barriers without the development of this germplasm, and the breeders would remain limited to selecting ecotypes for release as new cultivars. The identification of the apomixis-associated molecular markers will help in the early identification of reproductive mode in breeding materials, while in seedling stage, compared to current methods that cannot be performed until flowering stages. (AU)