Genetic variability of rice recurrent selection populations as affected by male sterility or manual recombination

Pesquisa Agropecuária Brasileira

Letícia Da Silveira Pinheiro¹  Paulo Hideo Nakano Rangel¹  Rosana Pereira Vianello¹  Claudio Brondani¹ 

[1] ,Embrapa Arroz e FeijãoSanto Antônio de Goiás GO ,Brazil

关键词: Oryza sativa;    allele variation;    rice breeding;    molecular markers;    population improvement;    Oryza sativa;    variação alélica;    melhoramento do arroz;    marcadores moleculares;    melhoramento populacional;   

DOI  :  10.1590/S0100-204X2012000600011

来源: SciELO

【 摘 要 】

The objective of this work was to determine the effect of male sterility or manual recombination on genetic variability of rice recurrent selection populations. The populations CNA-IRAT 4, with a gene for male sterility, and CNA 12, which was manually recombined, were evaluated. Genetic variability among selection cycles was estimated using14 simple sequence repeat (SSR) markers. A total of 926 plants were analyzed, including ten genitors and 180 individuals from each of the evaluated cycles (1, 2 and 5) of the population CNA-IRAT 4, and 16 genitors and 180 individuals from each of the cycles (1 and 2) of CNA 12. The analysis allowed the identification of alleles not present among the genitors for both populations, in all cycles, especially for the CNA-IRAT 4 population. These alleles resulted from unwanted fertilization with genotypes that were not originally part of the populations. The parameters of Wright's F-statistic (F IS and F IT) indicated that the manual recombination expands the genetic variability of the CNA 12 population, whereas male sterility reduces the one of CNA-IRAT 4.

【 授权许可】

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