1. 12/26/2016 Genetic characterization of stripe rust resistance in a common wheat landrace AWCC618 | GlobalRust.org
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Genetic characterization of stripe rust resistance in
a common wheat landrace AWCC618
Submitted by jb755 on Mon, 2015­07­27 20:32
Stripe rust of wheat was estimated to cause losses of A$127 m annually in Australia. Although stripe rust can be controlled
through the use of chemicals, breeding for resistance is considered to be the best means of control. Identification and
characterization of diverse sources of resistance is essential to achieve durable stripe rust control. A common wheat landrace
AWCC618 showed resistance (IT 1CN) to Australian Puccinia striiformis f. sp. tritici (Pst) pathotypes. AWCC618 was crossed
with the susceptible genotype Avocet S (AvS) to determine the genetic basis of resistance. Seedling tests on 123
AWCC618/AvS F families using Australian Pst pathotype 134 E16 A+ 17+ 27+ indicated monogenic inheritance of resistance
(22HR:68SEG:33HS; χ =3.34, non­significant at P=0.05 and 2 d.f.). The resistance locus was temporarily named YrAW3.
Selective genotyping of eight homozygous resistant (HR) and eight homozygous susceptible (HS) F families using the 90K
SNP Infinium assay tentatively located YrAW3 on chromosome 6A. The AWCC618/AvS population was advanced to F for
detailed mapping of the target region. YrAW3 appears to be a new locus. AWCC618 was crossed with three current Australian
cultivars to transfer YrAW3 to modern wheat backgrounds. Backcross­derivatives will also be useful for validation of linked
markers.
Primary Author:
Gessese
Primary Author Institution:
The University of Sydney Plant Breeding Institute, Australia
Keywords:
Australia (file:///C:/poster­abstract­keywords/australia)
stripe rust (file:///C:/poster­abstract­keywords/stripe­rust)
genetics (file:///C:/poster­abstract­keywords/genetics)
Primary Author Email:
mesfin.gessese@sydney.edu.au
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