Detection and mapping of a lethal locus in a eucalyptus hybrid population

Pesquisa Agropecuária Brasileira

Tatiana Barbosa Rosado²  Rafael Simões Tomaz²  Rodrigo Barros Rocha¹  Antônio Marcos Rosado¹  Alexandre Alonso Alves¹  Elza Fernandes De Araújo¹  Acelino Couto Alfenas²  Cosme Damião Cruz² 

[1] ,Universidade Federal de Viçosa Departamento de Biologia Geral Viçosa MG ,Brazil

关键词: Eucalyptus;    gametic selection;    genetic mapping;    QTL;    rust resistance;    segregation distortion;    Eucalyptus;    seleção gamética;    mapeamento genético;    QTL;    resistência à ferrugem;    distorção de segregação;   

DOI  :  10.1590/S0100-204X2011000900008

来源: SciELO

【 摘 要 】

The objective of this work was to verify the existence of a lethal locus in a eucalyptus hybrid population, and to quantify the segregation distortion in the linkage group 3 of the Eucalyptus genome. A E. grandis x E. urophylla hybrid population, which segregates for rust resistance, was genotyped with 19 microsatellite markers belonging to linkage group 3 of the Eucalyptus genome. To quantify the segregation distortion, maximum likelihood (ML) models, specific to outbreeding populations, were used. These models consider the observed marker genotypes and the lethal locus viability as parameters. The ML solutions were obtained using the expectation‑maximization algorithm. A lethal locus in the linkage group 3 was verified and mapped, with high confidence, between the microssatellites EMBRA 189 e EMBRA 122. This lethal locus causes an intense gametic selection from the male side. Its map position is 25 cM from the locus which controls the rust resistance in this population.

【 授权许可】

CC BY   
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