Exploring DNA Variant Segregation Types Enables Mapping Loci for Recessive Phenotypic Suppression of Columnar Growth in Apple.

ABSTRACT: Columnar apples trees, originated from a bud mutation 'Wijcik McIntosh,' develop a simple canopy and set fruit on spurs. These characteristics make them an important genetic resource for improvement of tree architecture. Genetic studies have uncovered that columnar growth habit is a dominant trait and is caused by a retroposon insertion that induces the expression of the neighboring gene Co encoding a 2OG-Fe(II) oxygenase. Here we report the genetic mapping of two loci of recessive suppressors (genes) c2 (on Chr10) and c3 (on Chr9) that are linked to repression of the retroposon-induced Co gene expression and associated columnar phenotype in 275 F₁ seedlings, which were developed from a reciprocal cross between two columnar selections heterozygous at

SUBMITTER: Dougherty L 

PROVIDER: S-EPMC7297030 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature