title: QTLs for Resistance to Major Rice Diseases Exacerbated by Global Warming: Brown Spot, Bacterial Seedling Rot, and Bacterial Grain Rot.
abstract: In rice (Oryza sativa L.), damage from diseases such as brown spot, caused by Bipolaris oryzae, and bacterial seedling rot and bacterial grain rot, caused by Burkholderia glumae, has increased under global warming because the optimal temperature ranges for growth of these pathogens are relatively high (around 30 °C). Therefore, the need for cultivars carrying genes for resistance to these diseases is increasing to ensure sustainable rice production. In contrast to the situation for other important rice diseases such as blast and bacterial blight, no genes for complete resistance to brown spot, bacterial seedling rot or bacterial grain rot have yet been discovered. Thus, rice breeders have to use partial resistance, which is largely influenced by environmental conditions. Recent progress in molecular genetics and improvement of evaluation methods for disease resistance have facilitated detection of quantitative trait loci (QTLs) associated with resistance. In this review, we summarize the results of worldwide screening for cultivars with resistance to brown spot, bacterial seedling rot and bacterial grain rot and we discuss the identification of QTLs conferring resistance to these diseases in order to provide useful information for rice breeding programs.
authors.affiliation: National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki, 305-8602, Japan.
authors.forename: Ritsuko
authors.initials: R
authors.lastname: Mizobuchi
authors.affiliation: National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki, 305-8602, Japan.
authors.forename: Shuichi
authors.initials: S
authors.lastname: Fukuoka
authors.affiliation: National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Ibaraki, 305-8604, Japan.
authors.forename: Seiya
authors.initials: S
authors.lastname: Tsushima
authors.affiliation: NARO Institute of Crop Science (NICS), 2-1-18 Kannondai, Tsukuba, Ibaraki, 305-8518, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yano
authors.affiliation: National Agriculture and Food Research Organization, Kyushu Okinawa Agricultural Research Center (NARO/KARC), 496 Izumi, Chikugo, Fukuoka, 833-0041, Japan. bsato@affrc.go.jp.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Sato
keywords: Bipolaris oryzae; Brown spot; Burkholderia glumae; Disease resistance; Grain rot; Oryza sativa L; Panicle blight; Seedling rot