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The green rice leafhopper (GRH, Nephotettix cincticeps Uhler) is a serious insect pest of rice ( Oryza sativa L.) in temperate regions of Asia. Wild Oryza species are the main source of resistance to insects. The W1413 accession of African wild rice ( O. longistaminata A. Chev. &amp; Roehrich) is resistant to GRH. To analyze its resistance, we developed 28 BC 3 F 3 introgression lines carrying W1413 segments in the genetic background of Nipponbare, a susceptible rice cultivar, and evaluated their GRH resistance. Five BC 3 F 3 populations were used for quantitative trait locus (QTL) analysis and seven BC 3 F 4 populations for QTL validation. Four significant QTLs on the long arm of chromosome 2 ( qGRH2 ), short arm of chromosome 4 ( qGRH4 ), short arm of chromosome 5 ( qGRH5 ), and long arm of chromosome 11 ( qGRH11 ) were identified. The contribution of the W1413 allele at qGRH11 was the largest among the four QTLs; the other QTLs also contributed to GRH resistance. Chromosomal locations suggested that qGRH11 corresponds to the previously reported GRH resistance gene Grh2 , qGRH4 to Grh6 , and qGRH5 to Grh1 . qGRH2 is a novel QTL for resistance to GRH. Thus, resistance of O. longistaminata to GRH can be explained by at least four QTLs.

breeding science

Four resistance alleles derived from &lt;i&gt;Oryza longistaminata&lt;/i&gt; (A. Chev. &amp; Roehrich) against green rice leafhopper, &lt;i&gt;Nephotettix cincticeps&lt;/i&gt; (Uhler) identified using novel introgression lines