Abstract
Wheat is one of the most important food crops, and its yield losses range from 20 to 100% due to leaf, stripe and stem rusts caused by Puccinia triticina, P. striiformis and P. graminis, respectively. New sources of resistance are strategically essential to limit the devastating effect of ever-evolving rust pathogens. In this study, we characterized 200 synthetic hexaploid wheats (SHWs) against all three rusts using rust pathotypes at seedling and adult plant stages in Queensland, Australia. We identified 57 accessions resistant to leaf rust, 77 to stripe rust and 69 accessions resistant to stem rust at the seedling stage. Ten SHWs were resistant to all three rusts, while 32 SHWs had dual resistance against leaf and stem rusts, and 28 SHWs had dual resistance to stripe and stem rust. We identified 24 SHWs carrying adult plant resistance (APR) for leaf, stripe and stem rust. The coefficient of correlation between yellow rust scores at seedling and adult plant stages were highest (r= 0.89), followed by stem rust (r= 0.77), and leaf rust (r= 0.72), which indicate the possibility of adult plant resistance in SHWs. The diagnostic kompetitive allele-specific PCR (KASP) markers for known rust resistance genes revealed that 14 SHW accessions carried Lr34, 85 carried Lr46, and 3 SHW carried Lr67, while none of the SHW carried Sr2. This study identified useful SHW lines for breeding resistance against all three types of rusts; some carried known durable resistance genes while others likely carry novel resistance loci.
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Claims 15
Claim · model-written summary
57 synthetic hexaploid wheat accessions resisted leaf rust at seedling stage.
- Taxon
- Wheat
Triticum aestivumt0 - Material
- accessionse0
- Outcome
- resistant to leaf ruste0
- Value
- 57 accessionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We identified 57 accessions resistant to leaf rust, 77 to stripe rust and 69 accessions resistant to stem rust at the seedling stage”
t0“Wheats”
Claim · model-written summary
77 accessions resisted stripe rust at seedling stage.
TriticumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“77 to stripe rust”
t0“Wheats”
Claim · model-written summary
69 accessions resisted stem rust at seedling stage.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“69 accessions resistant to stem rust at the seedling stage”
t0“Wheats”
Claim · model-written summary
Ten synthetic hexaploid wheats resisted all three rusts.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ten SHWs were resistant to all three rusts”
t0“Wheats”
Claim · model-written summary
32 synthetic hexaploid wheats had dual leaf and stem rust resistance.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“32 SHWs had dual resistance against leaf and stem rusts”
t0“Wheats”
Claim · model-written summary
28 synthetic hexaploid wheats had dual stripe and stem rust resistance.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 SHWs had dual resistance to stripe and stem rust”
t0“Wheats”
Claim · model-written summary
24 synthetic hexaploid wheats carried adult plant resistance to all three rusts.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We identified 24 SHWs carrying adult plant resistance (APR) for leaf, stripe and stem rust”
t0“Wheats”
Claim · model-written summary
Seedling and adult yellow rust scores correlated at r= 0.89.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yellow rust scores at seedling and adult plant stages were highest (r= 0.89)”
t0“Wheats”
Claim · model-written summary
Seedling and adult stem rust scores correlated at r= 0.77.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stem rust (r= 0.77)”
t0“Wheats”
e1“yellow rust scores at seedling and adult plant stages were highest (r= 0.89)”
Claim · model-written summary
Seedling and adult leaf rust scores correlated at r= 0.72.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf rust (r= 0.72)”
t0“Wheats”
e1“yellow rust scores at seedling and adult plant stages were highest (r= 0.89)”
Claim · model-written summary
14 synthetic hexaploid wheat accessions carried Lr34.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“14 SHW accessions carried Lr34”
t0“Wheats”
Claim · model-written summary
85 synthetic hexaploid wheat accessions carried Lr46.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“85 carried Lr46”
t0“Wheats”
Claim · model-written summary
Three synthetic hexaploid wheat accessions carried Lr67.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“3 SHW carried Lr67”
t0“Wheats”
Claim · model-written summary
No synthetic hexaploid wheat accession carried Sr2.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“none of the SHW carried Sr2”
t0“Wheats”
Claim · model-written summary
The study identified synthetic hexaploid wheat lines useful for breeding resistance to all three rusts.
- Outcome
- useful SHW lines for breeding resistance against all three types of rustse0
- Value
- some carried known durable resistance genese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study identified useful SHW lines for breeding resistance against all three types of rusts; some carried known durable resistance genes while others likely carry novel resistance loci”
t0“Wheats”