Identification of plant architecture and yield-related QTL in Vicia faba L.

Abstract

Low and unstable yields across seasons and environments are among the main reasons which make profitability for farmers too low. Along with resistance/tolerance to biotic and abiotic stresses, plant architecture and yield-related traits are the main determinants of yield stability. The current study was conducted to identify and validate quantitative trait loci (QTL) for plant architecture and yield-related traits in faba bean; our results provide novel information about the genetics of plant architecture traits in this crop. An equina × paucijuga recombinant inbred line population was derived and submitted to field experiments at Cordoba (Spain) over a period of four seasons. Stable QTL were identified for eight of the traits evaluated. QTL clusters were identified on almost each chromosome. The high inter-trait correlations between some of the traits controlled by a cluster of QTL might reflect either a set of closely linked loci or, more likely, pleiotropic effects. The stability of many of these major QTL in different years offers the possibility of exploiting them via marker-assisted selection. Further fine mapping of these target regions will help to identify potential candidate genes using synteny.