Data/hora: 05/06/2024 00:56:35

Biblioteca(s): | Embrapa Arroz e Feijão.
Data corrente: | 27/01/2006
Data da última atualização: | 14/05/2022
Autoria: | BRONDANI, R. P. V.; ZUCCHI, M. I.; BRONDANI, C.; RANGEL, P. H. N.; BORBA, T. C. de O.; RANGEL, P. N.; MAGALHÃES, M. R.; VENCOVSKY, R.
Afiliação: | ROSANA PEREIRA VIANELLO, CNPAF; MARIA IMACULADA ZUCCHI; CLAUDIO BRONDANI, CNPAF; PAULO HIDEO NAKANO RANGEL, CNPAF; TEREZA CRISTINA DE OLIVEIRA BORBA, CNPAF; PRISCILA NASCIMENTO RANGEL; MARA RUBIA MAGALHAES, UFG; ROLAND VENCOVSKY, ESALQ.
Título: | Genetic structure of wild rice Oryza glumaepatula populations in three Brazilian biomes using microsatellite markers.
Ano de publicação: | 2005
Fonte/Imprenta: | Genetica, v. 125, n. 2/3, p. 115-123, Nov. 2005.
DOI: | https://doi.org/10.1007/s10709-005-4916-4
Idioma: | Inglês
Conteúdo: | The existence of Oryza glumaepatula is threatened by devastation and, thus, the implementation of conservation strategies is extremely relevant. This study aimed to characterize the genetic variability and estimate population parameters of 30 O. glumaepatula populations from three Brazilian biomes using 10 microsatellite markers. The levels of allelic variability for the SSR loci presented a mean of 10.3 alleles per locus and a value of 0.10 for the average allelic frequency value. The expected total heterozygosity (He) ranged from 0.63 to 0.86. For the 30 populations tested, the mean observed (Ho) and expected heterozygosities (He) were 0.03 and 0.11within population, respectively, indicating an excess of homozygotes resulting from the preferentially self-pollinating reproduction habit. The estimated fixation index ( IS ) was 0.79 that differed significantly from zero, indicating high inbreeding within each O. glumaepatula population. The total inbreeding of the species (IT ) was 0.98 and the genetic diversity indexes among populations, ST and ST, were 0.85 and 0.90, respectively, indicating high genetic variability among them. Thus, especially for populations located in regions threatened with devastation, it is urgent that in situ preservation conditions should be created or that collections be made for ex situ preservation to prevent loss of the species genetic variability.
Palavras-Chave: | Genetic variability; Marcadores moleculares; Molecular markers; Oryza glumaepatula; Variabilidade genética.
Thesagro: | Arroz; Marcador Molecular; Recurso Genético.
Thesaurus Nal: | genetic resources; Oryza; population genetics.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Arroz e Feijão (CNPAF)
Exemplares: | CNPAF - (23221-1) - UPC - AP - DD - 2005 -  - 2005 - DIS