Segregation analysis of molecular markers in a population derived from Coffea liberica Hiern x C. eugenioides L.
Acta Agronómica(2014)
摘要
Coffee is a very important crop for the world economy. The commercial coffee production is based on
two species, Coffea arabica L. (70%) and C. canephora Pierre (30%). C. arabica is the only allotetraploid
(2n=4x=44) species, which has its primary center of diversity in the southwestern Ethiopia highlands. C.
arabica is the only species cultivated in Colombia and represents a very important economic and social
value. However, C. arabica has a very narrow genetic diversity and therefore, the use of diploid species
on coffee breeding is very important because they allow to broad its diversity. In this work, the genetic
segregation patterns were evaluated on a population of 101 F1 hybrid plants from a cross between the
diploid species C. liberica and C. eugenioides using 618 molecular markers, of which 168 SSRs and 2
ESTs exhibited polymorphic patterns that allowed segregation analysis. Approximately 24% of the loci
were null alleles, and the segregation distortion reached 23.5% at a < 0.01. A total of four segregant
types were observed, from up to seven possibilities. The origins of null alleles, possible causes of segregation
distortion, different segregation patterns obtained and recombination frequencies are discussed.
The knowledge derived from this study allowed to better understand the genetic segregation behavior
of these markers with the aim of developing genetic maps that have important applications for coffee
breeding programs as well as other commercial crops.
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关键词
microsatellites
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