Abstract
Rice (Oryza sativa L.) is one of the most important crops that are produced as human food, directly feeding people more than any other crop. Hence, it is important to increase the yield potential of rice through improving the disease resistance to prevailing rice diseases. Blast caused by the fungus Magnaporthe oryzae, sheath blight caused by the fungus Rhizoctonia solani Kühn, and bacterial panicle blight caused by the bacteria Burkholderia glumae and B. gladioli are serious rice diseases in many rice-producing regions. In spite of the chronic damages from these major diseases, the quantitative resistance to each of them is not known very well and any available disease-resistant varieties are rare or not stable. Although gene-for-gene resistance that is mediated by an R-Avr interaction has been intensively studied for blast, quantitative (or horizontal) resistance to a broad spectrum of races in M. oryzae is still poorly understood. Identification of the quantitative trait loci (QTLs) related to these diseases and using marker technology can facilitate marker-assisted selection to screen resistant traits in individual resources, which could ultimately lead to the development of novel disease-resistant rice varieties. This article is a summary of identified QTLs that are associated with rice diseases, including blast, sheath blight, and bacterial panicle blight that can be used in breeding programs.
Highlights
Rice (Oryza sativa L.) is one of the most important crops in the world, which feeds more than half of the world population and provides 20% of the energy that is required for humans [1]
The results showed significant increase of sheath blight resistance depending on the presence of qSB-11LE, indicating the probable lack of this favorable allele in O. indica varieties and the importance of the QTL in breeding programs for the improvement of sheath blight resistance, and the usefulness of the molecular markers close to the QTL region in marker assisted selection (MAS) [172]
In the study by Liu et al [166], a 216 recombinant inbred lines (RILs) population derived a cross of Jasmin 85 and Lemont were evaluated in two years (2008 and 2009) at three different locations (Arkansas, Texas, and Louisiana) to identify QTLs that are related to sheath blight resistance under field condition
Summary
Rice (Oryza sativa L.) is one of the most important crops in the world, which feeds more than half of the world population and provides 20% of the energy that is required for humans [1]. It should be noted that important agronomic characteristics of crops, such as yield and stress tolerance, are controlled by numerous quantitative trait loci (QTLs) and they are strongly influenced by the environment [5]. A QTL is an intra-genomic region that contains gene(s) that are associated with a specific quantitative trait, and it is a factor that links the molecular markers to a quantitative phenotype in a mapping population. Identification and use of resistant varieties against disease and examination of resistance genes associated with known resistance loci allows for the identification of QTLs that are associated with resistance and, in general, increases the information regarding the resistance mechanism [7,11,12,13,14]. This article summarizes and presents the QTLs that are associated with three important rice diseases: blast, sheath blight, and bacterial panicle blight
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