Inferring mating system parameters in forage peanut, Arachis pintoi, for Brazilian Amazon conditions
Acta amaz
;
49(4): 277-282, out. - dez. 2019.
Artigo
em Inglês
| LILACS
| ID: biblio-1118937
ABSTRACT
The search for alternatives to increase productivity and sustainability of livestock production in the Amazon region without increasing deforestation is challenging. Mixed pastures of grasses with forage peanut (Arachis pintoi) have shown positive economic impacts. However, gaps in the knowledge of the reproductive biology of A. pintoi have limited the development of new cultivars adapted to the environmental variations in the Brazilian Amazon. Pasture consortiums of Brachiaria humidicola with forage peanuts (cv. Mandobi) resulted in a 42% increase in weight gain productivity. New cultivars better adapted to the Amazon climate should bring even greater gains. We evaluated the mating system in twenty A. pintoi accessions, and approximately 40 offspring per accession genotyped with eight microsatellites (or markers). The parameters of genetic diversity and inbreeding, the outcrossing rate and coancestry were calculated. The observed heterozygosity was significantly higher and the fixation index was significantly lower in adults compared with the offspring. The crossing rate was variable among genotypes (2 to 80%), and the mean outcrossing rate was 36%. These results indicate that pollinator presence in pastures can influence gene flow in A. pintoi more than expected. Arachis pintoi presented a mixed mating system with a predominance of selfing, and families presented inbreeding and different levels of relatedness. New strategies of genotype conservation are needed to avoid pollinator-mediated crossing between accessions. (AU)
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Arachis
/
Comportamento Sexual Animal
/
Cruzamento
/
Ecossistema Amazônico
/
Genótipo
País/Região como assunto:
América do Sul
/
Brasil
Idioma:
Inglês
Revista:
Acta amaz
Assunto da revista:
Ciência
Ano de publicação:
2019
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Empresa Brasileira de Pesquisa Agropecuária/BR
/
Faculdade Meta/BR
/
Fundação Oswaldo Cruz/BR
/
Instituto Florestal de São Paulo/BR
/
Universidade Federal da Paraíba/BR
/
Universidade Federal do Acre/BR
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