Genetic variability of Brazilian rice landraces determined by SSR markers

Pesquisa Agropecuária Brasileira

Tereza Cristina De Oliveira Borba¹  Clistiane Dos Anjos Mendes¹  Élcio Perpétuo Guimarães¹  Tuliana Oliveira Brunes¹  Jaime Roberto Fonseca¹  Rosana Vianello Brondani¹  Claudio Brondani¹ 

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

关键词: Oryza sativa;    genotyping;    microsatellites;    participatory breeding;    rice breeding;    Oryza sativa;    genotipagem;    microssatélites;    melhoramento participativo;    melhoramento de arroz;   

DOI  :  10.1590/S0100-204X2009000700009

来源: SciELO

【 摘 要 】

The objective of this study was to evaluate the genetic variability of rice (Oryza sativa) landraces collected in Brazilian small farms. Twelve simple sequence repeat (SSR) markers characterized 417 landraces collected in 1986, 1987 and 2003, in the state of Goiás, Brazil. The number of landraces with long and thin grain type increased in the evaluated period, probably due to market demand. Based on the molecular data, the genetic variability increased during this period and, as per to the factorial correspondence analysis, most of the accessions were grouped according to the year of collection. The incorporation of modern rice cultivars in landrace cultivation areas and the selection carried out by small farmers are the most probable factors responsible for increasing landrace genetic variability, during the evaluated period. Genotype exchange between farmers, selection practice and local environmental adaptation are able to generate novel adapted allele combinations, which can be used by breeding programs, to reinitiate the process.

【 授权许可】

CC BY   
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