Identification of QTL for resistance to plum pox virus strains M and D in Lito and Harcot apricot cultivars
Publication Overview
Abstract Sharka is a severe apricot viral disease
caused by the plum pox virus (PPV) and is responsible
for large crop losses in many countries. Among the
known PPV strains, both PPV-D (Dideron) and PPV-M
(Marcus) are virulent in apricot, the latter being the
most threatening. An F1 apricot progeny derived from
Lito, described in the literature as resistant, crossed to
the susceptible selection BO81604311 (San Castrese
x Reale di Imola) was used to study the genetic control
of resistance to PPV. A population of 118 individuals
was phenotyped by inoculating both PPV-D and
PPV-M strains in replicated seedlings and scored for
3 years. An additional set of 231 seedlings from the
same cross was also phenotyped for 2 years. SSRbased
linkage maps were used for quantitative trait
locus (QTL) analysis. A major QTL of resistance to
both PPV-M and PPV-D strains was found in the top
half of the Lito linkage group 1, where a QTL was
previously described in Stark Earli-Orange, the donor
of Lito resistance. The LOD score was considerably
enhanced when the recovery of plants from infection
was taken into account. The results obtained in Lito
were compared with those observed in a second apricot
cross progeny (Harcot x Reale di Imola) in which
QTL of resistance to sharka were also mapped in the
same linkage group 1 for both PPV strains. Several
models of resistance to sharka disease are discussed
considering the segregation frequencies, the QTL
alignment in the two maps and the information
gathered from the literature.
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