2024-03-28T13:11:31Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1275562020-06-02T07:44:10Zcom_10261_75com_10261_6col_10261_454
DIGITAL.CSIC
author
Büttner, Bianca
author
Silvar Casao, Cristina
author
Casas Cendoya, Ana María
author
Igartua Arregui, Ernesto
author
Mayer, K.
author
Usadel, Björn
author
Schweizer, Günther
2016-01-13T11:32:57Z
2016-01-13T11:32:57Z
2014-06-03
1st International Workshop on Barley Leaf Diseases (03-06.06.2014, Salsomaggiore Terme, Italia)
http://hdl.handle.net/10261/127556
Scald, caused by
Rhynchosporium commune
(formerly
R. secalis
), is one of the most
prevalent barley
diseases worldwide. To date, four major scald resistance genes have been
mapped in cultivated barley (
Hordeum vulgare ssp. vulgare
), and another four in wild
barley (
Hv. spontaneum
) or
Hv. bulbosum
. The most abundant and effective one is the
Rrs1
resistanc
e locus, formerly known as
Rh
-
Rh3Rh4
locus. It was mapped to the
centromeric region of chromosome 3H. However, it is still not clear whether
Rrs1
is a
collection of several
R
-
genes close to each other or several alleles of the same gene. A
search for new r
esistance sources revealed that Spanish landrace
-
derived lines SBCC145
and SBCC154 showed outstanding resistance to scald. To analyze the genetic basis in more
detail two large DH mapping populations were developed crossing each donor line with cv.
Beatrix
. A large QTL in the centromeric region of chromosome 3H was found in both
populations phenotyped for scald resistance in a well
-
established greenhouse test,
therefore, confirmed this locus as the only resistance locus in both populations. To confirm
and e
nclose this locus, the “
Rrs1
region” has been saturated with all available SSR and
SNP
-
markers and a consensus map was constructed. New markers for this region are
developed based on the lllumina iSelect custom 9K barley chip, the barley genome zipper
and
a BSA analysis with AFLP. The genome zipper identified several candidate genes.
Because of a low gene/cM density, an enrichment of candidate sequences in the region of
Rrs1
is done by a BSTA (bulked segregant transcriptome analysis) with four normalized
cD
NA libraries and Illumina HiSeq in combination with a high resolution mapping
program. For fine mapping and haplotyping of all the genes around the
Rrs1
loci a
mapping population comprising >10,000 F
2
from the cross SBCC145 x Beatrix has been
constructed.
F
2
screening of about 11,000 lines to select recombinant lines between two
flanking markers has identified around 442 verified recombinant plants. The effective
Rrs1
allele found and the closely linked markers developed are already useful tools for
molecul
ar breeding programs.
eng
closedAccess
The Rrs1 locus and resistance against scald in barley.
póster de congreso
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https://digital.csic.es/bitstream/10261/127556/5/accesoRestringido.pdf.txt
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accesoRestringido.pdf.txt