Rice blast caused by Pyricularia
oryzae (syn. Magnaporthe oryzae) is a destructive
disease of rice
worldwide that poses a serious threat to rice
production. Strengthening blast resistance is an important objective in rice breeding programs. Race-specific resistance
genes (R-genes) confer complete resistance to blast, but new races of
blast pathogen can overcome it. To avoid the genetic vulnerability of R-genes,
race-nonspecific resistance in Japanese upland rice varieties has been focused
on its durability. However,
linkage drag between genes controlling this type of blast resistance and
undesired traits has hindered its use. We
genetically dissected race-nonspecific resistance to rice blast. Among detected QTLs, a single recessive resistance gene, pi21, was
identified by map-based cloning. The use of race-nonspecific resistance genes like pi21 has improved
durable resistance in rice breeding programs.
Author
(s) Details
Kazutoshi Okuno
Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1
Tennodai, Tsukuba, Ibaraki 305-8577, Japan and Kayada 2069-6, Yachiyo, Chiba
276-0043, Japan.
Shuichi Fukuoka
National
Institute of Crop Science, National Agriculture Research Organization, 2-1-2
Kannondai, Tsukuba, Ibaraki 305-8518, Japan.
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