Are the dominant and recessive plant disease resistance genes similar? A case study of rice R genes and Xanthomonas oryzae pv. oryzae races.

Genetics
Z K LiG S Khush

Abstract

The resistance of rice to its bacterial blight pathogen Xanthomonas oryzae pv. oryzae (Xoo) has both qualitative and quantitative components that were investigated using three near-isogenic line sets for four resistance (R) genes (Xa4, xa5, xa13, and Xa21) and 12 Xoo races. Our results indicate that these two resistance components of rice plants were associated with the properties of the R genes. The qualitative component of the R genes was reflected by their large effects against corresponding avirulent Xoo races. The quantitative component of the R genes was their residual effects against corresponding virulent races and their epistatic effects, which together could lead to high-level resistance in a race-specific manner. Our results revealed important differences between the different types of R genes. Two R genes, Xa4 and Xa21, showed complete dominance against the avirulent Xoo races and had large residual effects against virulent ones. They acted independently and cumulatively, suggesting they are involved in different pathways of the rice defensive system. The third R gene, xa5, showed partial dominance or additivity to the avirulent Xoo races and had relatively small but significant residual effects against the virulent...Continue Reading

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Citations

Jun 1, 2005·Trends in Biotechnology·Sarah J Gurr, Paul J Rushton
Jun 10, 2006·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·G P Yan, X M Chen
Dec 16, 2004·Molecular Plant-microbe Interactions : MPMI·Anjali S Iyer, Susan R McCouch
Dec 6, 2005·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Zhaohui ChuShiping Wang
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Jul 23, 2003·Current Opinion in Plant Biology·Ralph Panstruga
Feb 18, 2004·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·B Pérez-VichS T Berry
Apr 17, 2004·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Wenxue ZhaiLihuang Zhu
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Jun 17, 2015·Annual Review of Phytopathology·James K M Brown
Dec 25, 2010·Science China. Life Sciences·Huasong ZouGongyou Chen

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