Abstract

MORA MORENO, Ruben Eduardo; SOTO, Johana Carolina  and  LOPEZ, Camilo. Identification of QTLs Associated to Plant Architecture in Cassava (Manihot esculenta). Acta biol.Colomb. [online]. 2016, vol.21, n.1, pp.99-109. ISSN 0120-548X.  https://doi.org/10.15446/abc.v21n1.49251.

Cassava (Manihot esculenta) is the fourth most important crop worldwide as a source of calories for the human population after rice, sugar and corn and therefore it is considered as a staple crop. Cassava's architecture has been considered as a key factor underlying the physiology of yield, relating morphological traits with productivity. In this work different characteristics of plant architecture were evaluated in a cassava F1 population composed by 133 complete siblings (family K) planted in two biogeographically different zones: La Vega (Cundinamarca) and Arauca (Arauca) in Colombia. The characteristics evaluated related to the vegetal architecture were plant height (AT), number of shoots (NB), internodes length (LE), number of roots (NR), root weight (PR), petiole pigmentation (PP), leaf area (AH) and leaf type (TH). From the data obtained and using a SNP- (Single Nucleotide Polymorphism) high-density genetic map a QTLs analysis (Quantitative Trait Loci) was carried out. It was possible to identify three QTLs for La Vega associated with characters plant height, internodes length and leaf area. From the Arauca's dataset, three QTLs were detected associated with plant height, number of shoots and internodes length. The QTLs were distributed into four linkage groups and explained between 18.93 and 41.92 % of genetic variation.

Keywords : Cassava; genetic mapping; linkage group; molecular marker; vegetal architecture; QTL.

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