Mendelian genetics has been useful for elucidating qualitative trait variation in Musa (Ortiz 2000). Likewise, biometrical approaches have facilitated the understanding of host plant resistance genetics to pathogens and pests affecting crop yield, or attributing to ploidy or gene action to bunch and fruit traits. Quantitative trait variation may be also affected by the environment and the genotype-by-environment interaction (Ortiz and Tenkouano 2011). Recent advances in high-throughput omics technology will further provide

Department of Plant Breeding and Biotechnology, Swedish University of Agricultural Sciences, Box 101, SE-230 53, Alnarp, Sweden; e-mail: [email protected]

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