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SESSION 4: GENETICS OF HOSTS – PLANT RESISTANCE TO FUSARIUM,
VARIETY DEVELOPMENT
Screening for new sources of FHB and DON
resistance in Chinese germplasm collected at CIMMYT
genebank
X. He, P. K. Singh, S. Dreisigacker, T. Payne, N. Schlang, E. Duveiller
Global Wheat Program, International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal
6-641, 06600 Mexico, D.F., Mexico
E-mail: x.he@cgiar.org
Fusarium head blight (FHB) is a fungal disease with global importance, which
causes not only yield reduction, but also the contamination of food and feed
through producing mycotoxins such as deoxynivalenol (DON). CIMMYT-Mexico
has been working on FHB for more than 30 years. In the mid-1980s, a shuttle
breeding and germplasm exchange program was launched between CIMMYT-
Mexico and China, which significantly promoted the incorporation of the FHB
resistance of Chinese germplasm into high yielding, semi-dwarf and rust resistant
CIMMYT wheats. Most of the Chinese wheat genotypes collected at CIMMYT
genebank have not been fully characterized for FHB and DON resistance in
Mexican environments. In 2009, 491 Chinese varieties were tested in CIMMYT’s
FHB screening nursery at El Batan, Mexico, using spray inoculation. Of these
entries, 304 (62%) showed a FHB index below 10% and were screened at
CIMMYT’s CENEB station near Ciudad Obregón in 2010, for phenological traits
(plant height and flowering date) and rust resistance. In 2012, 140 elite lines with
good rust resistance and agronomic types were evaluated at El Batan for field
FHB resistance and DON contamination. One hundred and sixteen (83%) entries
showed FHB index lower than 10%, while 120 (86%) had DON content lower than
2.0, exhibiting that most of the tested lines have good resistance. A subset of 102
elite entries was selected for haplotyping, using markers linked to 10 well known
FHB QTL. The results indicated that around 40% of the lines have the 2DL QTL
from Wuhan 1 and CJ9306, and 27% have the 3BS QTL from Sumai 3, while the
other 8 QTL are of low frequency. These materials, especially those with no
known FHB QTL, could be used in breeding programs as new resistance sources.
Keywords: wheat, Fusarium, mycotoxin, resistance
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