Dwarf tree habit is a recessive phenotype independent of the dominant columnar growth in scion apples and controlled by multiple genomic loci and their epistatic interactions.

Abstract excerpt

The genetic control of dwarf phenotype in scion apples is largely unknown, although quantitative trait loci (QTLs) Dw1, Dw2, and Dw3 with a major dwarfing effect have been reported in apple rootstocks. To fill the knowledge gap in scion apples, we used the bulk segregant analysis (BSA)-seq approach to identify QTLs for the dwarf and (ultra-) tall phenotypes over three growth seasons in an F1 population of 365...

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