Genetics of zonal leaf chlorosis and genetic linkage to a major gene regulating skin anthocyanin production (MdMYB1) in the apple (Malus × domestica) cultivar Honeycrisp.

ABSTRACT: 'Honeycrisp' is a widely grown and acclaimed apple cultivar that is commonly used in breeding programs. It also has a well-documented tendency to develop the physiological disorder, zonal leaf chlorosis (ZLC). This disorder causes reduced photosynthetic capacity and is thought to be due to a problem with phloem loading, although the underlying genetics of the disorder have not previously been discerned. In order to understand the breeding implications of the disorder, six families with 'Honeycrisp' as a parent and one family with 'Honeycrisp' as both a maternal and paternal grandparent were evaluated for ZLC incidence over two years. One major quantitative trait locus (QTL) for ZLC incidence was identified on linkage group (LG) 9. A haplotype in 'Honeycrisp' that originated from grandparen

SUBMITTER: Howard NP 

PROVIDER: S-EPMC6349313 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature