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Molecular characterization of the CRa gene conferring clubroot resistance in Brassica rapa
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Molecular characterization of the CRa gene conferring clubroot resistance in Brassica rapa
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Journal Article
Molecular characterization of the CRa gene conferring clubroot resistance in Brassica rapa
2012
Overview
Clubroot disease is one of the major diseases affecting Brassicaceae crops, and a number of these crops grown commercially, such as Chinese cabbage (
Brassica rapa
L. ssp.
pekinensis
), are known to be highly susceptible to clubroot disease. To provide protection from this disease, plant breeders have introduced genes for resistance to clubroot from the European turnip into susceptible lines. The
CRa
gene confers specific resistance to the clubroot pathogen
Plasmodiophora brassicae
isolate M85. Fine mapping of the
CRa
locus using synteny to the
Arabidopsis thaliana
genome and partial genome sequences of
B. rapa
revealed a candidate gene encoding a TIR-NBS-LRR protein. Several structural differences in this candidate gene were found between susceptible and resistant lines, and
CRa
expression was observed only in the resistant line. Four mutant lines lacking clubroot resistance were obtained by the UV irradiation of pollen from a resistant line, and all of these mutant lines carried independent mutations in the candidate TIR-NBS-LRR gene. This genetic and molecular evidence strongly suggests that the identified gene is
CRa
. This is the first report on the molecular characterization of a clubroot Resistance gene in Brassicaceae and of the disease resistance gene in
B. rapa
.
Publisher
Springer Netherlands,Springer Nature B.V
Subject
/ Biomedical and Life Sciences
/ Brassica
/ Brassica rapa - parasitology
/ Clubroot
/ Crops
/ genes
/ genetics
/ Genomes
/ loci
/ Mutation
/ Plant Diseases - parasitology
/ Plants, Genetically Modified
/ Plasmodiophorida - pathogenicity
/ Pollen
/ proteins
/ Sequence Homology, Amino Acid
/ Synteny
/ turnips
