EFS12- Book of abstracts - Contact
EFS12- Book of abstracts - Contact
EFS12- Book of abstracts - Contact
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SESSION 4: GENETICS OF HOSTS – PLANT RESISTANCE TO FUSARIUM,<br />
VARIETY DEVELOPMENT<br />
FHB Resistance in S<strong>of</strong>t Red Winter Wheat: Breeding<br />
and Genomic Selection<br />
C. Sneller, A. H<strong>of</strong>fstetter, A. Cabrera<br />
The Ohio State University, 1680 Madison Avenue, Wooster Ohio, 44691, USA<br />
E-mail: sneller.5@osu.edu<br />
S<strong>of</strong>t Red Winter Wheat (SRWW) adapted to the Eastern US has considerable<br />
resistance to Fusarium Head Blight (FHB). Breeders have effectively used<br />
traditional breeding to utilize this resistance in developing new cultivars. Our<br />
objectives are 1) review the evidence <strong>of</strong> resistance SRWW, 2) assess breeding<br />
progress for FHB resistance in SRWW, 3) conduct association analysis <strong>of</strong><br />
resistance QTL, and 4) use genomic selection to improve FHB resistance.<br />
The USDA has funded FHB research since 1996 including a cooperative nursery<br />
to evaluate FHB resistance in breeding lines prior to release as cultivars. Using<br />
that data from those trials and other data it is apparent that SRWW has useful<br />
variation for many types <strong>of</strong> resistance including resistance to toxin accumulation:<br />
high levels <strong>of</strong> all resistant mechanisms are readily found. An analysis <strong>of</strong><br />
phenotypes <strong>of</strong> breeding lines evaluated from 1996-2012 indicate that breeders<br />
have been successful using phenotypic selection to improve FHB resistance in<br />
SRWW. While there has been some use <strong>of</strong> MAS for Fhb1 and other QTL, most <strong>of</strong><br />
the gain in resistance is apparently due to native SRWW genetics.<br />
Biparental crosses have revealed some QTL for SRWW FHB resistance. Our<br />
association analysis suggests that in breeding populations that most <strong>of</strong> the<br />
genetic variation is due to genes with small effects. We have implemented<br />
genomic selection (GS) for FHB resistance. Using cross validation we estimate<br />
the relative efficiency (RE = r/sqrt(h 2 )) <strong>of</strong> GS versus phenotypic selection for FHB<br />
resistance is 0.47. In our breeding scheme a RE <strong>of</strong> 0.47 provides a RE <strong>of</strong> GS<br />
versus phenotypic selection on a per year basis <strong>of</strong> 2.35. New estimates using<br />
additional markers and phenotypic data will be presented as well as some results<br />
from implementing GS.<br />
Keywords: Fusarium, breeding, genomic, selection<br />
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