Articles
QTLS FOR BROWN SPOT RESISTANCE IN EUROPEAN PEAR
Article number
1100_26
Pages
167 – 171
Language
English
Abstract
Brown spot (Stemphylium vesicarium) is one of the most serious fungal disease
that affects the pear tree orchards in the Po valley.
In this region, which produces 90%
of the pears in Italy, several antifungal treatments must be repeated along the period
between flowering and harvest.
In addition, many of the most widely grown varieties of
pear (e.g., Abbé Fétel) are very susceptible to this fungus, while others, such as William
and his mutated sports are substantially resistant.
With the aim to develop molecular
markers linked with brown spot resistance, plants derived from the cross Abbé Fétel
× Max Red Bartlett were challenged for two consecutive years with a suspension of
conidia both on leaves and fruits of each seedling.
As a control, both the parents of the
progeny and the varieties Conference and William were inoculated.
On the genetic
maps of the two parents QTL analysis revealed the presence of two QTLs, one for
resistance to brown spot in Max Red Bartlett and another for the susceptibility in
Abbé Fétel. The availability of molecular markers in the regions of QTLs is an
important step forward towards the selection of new pear genotypes resistant to brown
spot by Marker-Assisted Selection (MAS).
that affects the pear tree orchards in the Po valley.
In this region, which produces 90%
of the pears in Italy, several antifungal treatments must be repeated along the period
between flowering and harvest.
In addition, many of the most widely grown varieties of
pear (e.g., Abbé Fétel) are very susceptible to this fungus, while others, such as William
and his mutated sports are substantially resistant.
With the aim to develop molecular
markers linked with brown spot resistance, plants derived from the cross Abbé Fétel
× Max Red Bartlett were challenged for two consecutive years with a suspension of
conidia both on leaves and fruits of each seedling.
As a control, both the parents of the
progeny and the varieties Conference and William were inoculated.
On the genetic
maps of the two parents QTL analysis revealed the presence of two QTLs, one for
resistance to brown spot in Max Red Bartlett and another for the susceptibility in
Abbé Fétel. The availability of molecular markers in the regions of QTLs is an
important step forward towards the selection of new pear genotypes resistant to brown
spot by Marker-Assisted Selection (MAS).
Authors
P. De Franceschi, A. Ciriani, M. Collina, A. Brunelli, L. Dondini
Keywords
Stemphylium vesicarium, molecular markers, Pyrus communis
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