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
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.
National Institute of Crop Science, National Agriculture Research Organization, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8518, Japan.
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