Publication Overview
Abstract Vegetative propagation enables the multiplication of
plants that are genetically identical to the original. Hardwood
cuttings have a low cost advantage and are used widely for the
propagation of JM series apple rootstocks, which root well
from hardwood cuttings. To breed new apple rootstocks with
similarly high rooting capabilities, the development of a
marker-assisted selection method is desirable. Therefore, it is
important to understand the genetic mechanisms behind the
rooting capabilities of hardwood cuttings. We identified quantitative
trait loci (QTLs) for the rooting capability of ‘JM7’
using a QTL analysis with phenotypic data obtained under
two environmental conditions. The QTLs for rooting rate and
root quantity co-located. The QTL for rooting rate explained
66 % of the genetic variance and 57 % of the phenotypic variance.
Graphical genotyping and database searching revealed
candidate genes, including three related to auxin response, one
related to ethylene response, and a gene encoding a WRKY
transcription factor.
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