Dissection of the factors affecting development-controlled and race-specific disease resistance conferred by leucine-rich repeat receptor kinase-type <Emphasis Type="Italic">R</Emphasis> genes in rice |
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Authors: | Jing Zhao Jing Fu Xianghua Li Caiguo Xu Shiping Wang |
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Institution: | (1) National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, 430070 Wuhan, China |
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Abstract: | Development-controlled resistance and resistance specificity frequently restrict the application of a disease resistance (R) gene in crop breeding programs. Xa3/Xa26 and Xa21, encoding leucine-rich repeat (LRR)-kinase type plasma membrane proteins, mediate race-specific resistance to Xanthomonas oryzae pv. oryzae (Xoo), which causes bacterial blight, one of the most devastating rice diseases. Plants carrying Xa3/Xa26 and plants carrying Xa21 have different resistance spectra and the functions of the two R genes are regulated by developmental stage. Four chimeric genes encoding proteins consisting of different parts of XA3/XA26
and XA21 were constructed by domain swapping and transformed into a susceptible rice variety. The resistance spectra and development-regulated
resistance of the transgenic plants carrying Xa3/Xa26, Xa21, or chimeric gene to different Xoo strains were analyzed in the same genetic background. The results suggest that the gradually increased expression of Xa3/Xa26 and Xa21 plays an important role in the progressively enhanced Xoo resistance during rice development. In addition, the LRR domains of XA3/XA26 and XA21 are important determinants of race-specific
recognition during rice–Xoo interaction, but juxtamembrane regions of the two R proteins also appear to contribute to resistance specificity.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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