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Journal Article

Journal Article

Lr67/Yr46 confers adult plant resistance to stem rust and powdery mildew in wheat  [2014]

Herrera-Foessel, Sybil A.; Singh, Ravi P.; Lillemo, Morten; Huerta-Espino, Julio; et al.

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KEY MESSAGE : We demonstrate that Lr67/Yr46 has pleiotropic effect on stem rust and powdery mildew resistance and is associated with leaf tip necrosis. Genes are designated as Sr55, Pm46 and Ltn3 , respectively. Wheat (Triticum aestivum) accession RL6077, known to carry the pleiotropic slow rusting leaf and yellow rust resistance genes Lr67/Yr46 in Thatcher background, displayed significantly lower stem rust (P. graminis tritici; Pgt) and powdery mildew (Blumeria graminis tritici; Bgt) severities in Kenya and in Norway, respectively, compared to its recurrent parent Thatcher. We investigated the resistance of RL6077 to stem rust and powdery mildew using Avocet� ×� RL6077 F₆ recombinant inbred lines (RILs) derived from two photoperiod-insensitive F₃ families segregating for Lr67/Yr46. Greenhouse seedling tests were conducted with Mexican Pgt race RTR. Field evaluations were conducted under artificially initiated stem rust epidemics with Pgt races RTR and TTKST (Ug99� +� Sr24) at Ciudad Obregon (Mexico) and Njoro (Kenya) during 2010–2011; and under natural powdery mildew epiphytotic in Norway at � s and Hamar during 2011 and 2012. In Mexico, a mean reduction of 41� % on stem rust severity was obtained for RILs carrying Lr67/Yr46, compared to RILs that lacked the gene, whereas in Kenya the difference was smaller (16� %) but significant. In Norway, leaf tip necrosis was associated with Lr67/Yr46 and RILs carrying Lr67/Yr46 showed a 20� % reduction in mean powd
ery mildew severity at both sites across the 2� years of evaluation. Our study demonstrates that Lr67/Yr46 confers partial resistance to stem rust and powdery mildew and is associated with leaf tip necrosis. The corresponding pleiotropic, or tightly linked, genes, designated as Sr55, Pm46, and Ltn3, can be utilized to provide broad-spectrum durable disease resistance in wheat.
From the journal
Theoretical and applied genetics
ISSN : 0040-5752

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2014
Volume:
127
Issue:
4
Start Page:
781
End Page:
789
Publisher:
Springer-Verlag
All titles:
"Lr67/Yr46 confers adult plant resistance to stem rust and powdery mildew in wheat"@eng
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2014
Volume:
127
Issue:
4
Start Page:
781
End Page:
789
Publisher:
Springer-Verlag
All titles:
"Lr67/Yr46 confers adult plant resistance to stem rust and powdery mildew in wheat"@eng