INVESTIGADORES
TEN HAVE Arjen
artículos
Título:
Three QTLs for Botrytis cinerea resistance in tomato
Autor/es:
FINKERS, R, VAN DEN BERG, P, VAN BERLOO, R. TEN HAVE, A, VAN HEUSDEN, A, VAN KAN, J AND LINDHOUT, P.
Revista:
THEORETICAL AND APPLIED GENETICS
Referencias:
Año: 2007 vol. 114 p. 585 - 593
ISSN:
0040-5752
Resumen:
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Tomato (Solanum lycopersicum) is
susceptible to grey mold (Botrytis cinerea). Partial resistance
to
this fungus was identiWed in accessions of wild relatives of tomato
such as S. habrochaites LYC4. In order
to identify loci involved in
quantitative resistance
(QTLs) to B. cinerea, a population of 174 F2
plants was
made originating from a cross between S. lycopersicum cv.
Moneymaker and S. habrochaites LYC4. The population was genotyped and
tested for susceptibility to
grey mold using a stem bioassay. Rbcq1,
a QTL reducing lesion growth (LG) and Rbcq2, a QTL reducing
disease
incidence (DI) were identified. Rbcq1 is
located on Chromosome 1 and
explained 12% of the
total phenotypic variation while Rbcq2 is
located on
Chromosome 2 and explained 15% of the total pheno-
typic
variation. Both QTL eVects were conWrmed by
assessing disease
resistance in two BC2S1 progenies
segregating for either of the two
QTLs. One additional
QTL, Rbcq4 on Chromosome 4 reducing DI, was
iden
tified in one of the BC2S1 progenies. F2 individuals,
homozygous for the Rbcq2 and Rbcq4 alleles of S. hab
rochaites showed
a reduction of DI by 48%. QTLs
from S. habrochaites LYC4 oVer good
perspectives for
breeding B. cinerea resistant tomato cultivars.