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Eight blast resistance genes --Pia, Pib, Pik-s, Pik-h, Pita, Piz-t, Pi20, and one of three (Pii, Pi3, or Pi5(t)) were identified in 42 IRRI-bred varieties following a differential system using Philippine blast isolates. Among these genes, two genes Pib and one of Pik alleles (Pik-s or Pik-h), were found in almost all IRRI varieties. The number of resistance genes in each variety varied from two to...
In the IRRI-Japan Collaborative Research Project, four kinds of differential varieties, monogenic lines and near isogenic lines (NILs) with three kinds of genetic backgrounds have been developed for the following 24 resistance genes Pia, Pib, Pii, Pik, Pik-h, Pik-m, Pik-p, Piks, Pish, Pita, Pita-2, Pit, Piz, Piz-5 (Pi2), Piz-t, Pi1, Pi3, Pi5(t), Pi7, Pi9 (t), Pi11 (t), Pi12 (t), Pi19 (t), and Pi20...
Bacterial seedling rot (BSR), a destructive disease of rice (Oryza sativa L.), is caused by the bacterial pathogen Burkholderia glumae. To identify QTLs for resistance to BSR, we conducted a QTL analysis using chromosome segment substitution lines (CSSLs) derived from a cross between Nona Bokra (resistant) and Koshihikari (susceptible). Comparison of the levels of BSR in the CSSLs and their recurrent...
Resistance to rice virus diseases is an important requirement in many Southeast Asian rice breeding programs. Inheritance of resistance to rice tungro spherical virus (RTSV) in TW5, a near-isogenic line derived from Indonesian rice cultivar Utri Merah, was compared to that in TKM6, an Indian rice cultivar. Both TKM6 and Utri Merah are cultivars resistant to RTSV infections. Crosses were made between...
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