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Kazunari Nozue,박창진,Pamela C. Ronald 한국식물학회 2011 Journal of Plant Biology Vol.54 No.4
The rice host sensor, XA21, confers robust resistance to most strains of Xanthomonas oryzae pv. oryzae (Xoo), the casual agent of bacterial blight disease. Using in planta fluorescence imaging of Xoo strain PXO99Az expressing a green fluorescent protein (Xoo-gfp)we show that XA21 restricts Xoo spread at the point of infection. This noninvasive and quantitative method to measure spatial distribution of Xoo populations in planta facilitates detailed assessment of plant disease resistance.
박창진,Patrick E. Canlas,Pamela C. Ronald 한국식물학회 2012 Journal of Plant Biology Vol.55 No.1
The rice pattern recognition receptor, XA21,confers robust resistance to the bacterial pathogen Xanthomonas oryzae pv. oryzae (Xoo). We have generated transgenic plants that express Xa21 only in the presence of the glucocorticoid hormone, dexamethasone (DEX). DEX-mediated transcriptional induction of Xa21 is accompanied by upregulation of pathogenesis-related 1 gene expression and restriction of Xoo multiplication. The DEXinducible system can be used to synchronize the XA21-mediated response to infection throughout the entire leaf,facilitating the study of innate immunity.
Towards a better bowl of rice: assigning function to tens of thousands of rice genes
Jung, Ki-Hong,An, Gynheung,Ronald, Pamela C. Nature Publishing Group 2008 Nature reviews. Genetics Vol.9 No.2
Rice, one of the most important food crops for humans, is the first crop plant to have its genome sequenced. Rice whole-genome microarrays, genome tiling arrays and genome-wide gene-indexed mutant collections have recently been generated. With the availability of these resources, discovering the function of the estimated 41,000 rice genes is now within reach. Such discoveries have broad practical implications for understanding the biological processes of rice and other economically important grasses such as cereals and bioenergy crops.
Park, Chang-Jin,Wei, Tong,Sharma, Rita,Ronald, Pamela C. Springer US 2017 Rice Vol.10 No.-
<P><B>Background</B></P><P>The rice immune receptor XA21 confers resistance to the bacterial pathogen, <I>Xanthomonas oryzae</I> pv. <I>oryzae</I> (<I>Xoo</I>). To elucidate the mechanism of XA21-mediated immunity, we previously performed a yeast two-hybrid screening for XA21 interactors and identified XA21 binding protein 21 (XB21).</P><P><B>Results</B></P><P>Here, we report that XB21 is an auxilin-like protein predicted to function in clathrin-mediated endocytosis. We demonstrate an XA21/XB21 in vivo interaction using co-immunoprecipitation in rice. Overexpression of <I>XB21</I> in rice variety Kitaake and a Kitaake transgenic line expressing XA21 confers a necrotic lesion phenotype and enhances resistance to <I>Xoo</I>. RNA sequencing reveals that <I>XB21</I> overexpression results in the differential expression of 8735 genes (4939 genes up- and 3846 genes down-regulated) (≥2-folds, FDR ≤0.01). The up-regulated genes include those predicted to be involved in ‘cell death’ and ‘vesicle-mediated transport’.</P><P><B>Conclusion</B></P><P>These results indicate that XB21 plays a role in the plant immune response and in regulation of cell death. The up-regulation of genes controlling ‘vesicle-mediated transport’ in XB21 overexpression lines is consistent with a functional role for XB21 as an auxilin.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1186/s12284-017-0166-1) contains supplementary material, which is available to authorized users.</P>
김한해,조안나,이무영,양순모,Xiaozhi Ma,Pamela C. Ronald,이인석 한국분자세포생물학회 2019 Molecules and cells Vol.42 No.2
Bacterial species in the genus Xanthomonas infect virtually all crop plants. Although many genes involved in Xanthomonas virulence have been identified through molecular and cellular studies, the elucidation of virulence-associated regulatory circuits is still far from complete. Functional gene networks have proven useful in generating hypotheses for genetic factors of biological processes in various species. Here, we present a genome-scale co-functional network of Xanthomonas oryze pv. oryzae (Xoo) genes, XooNet (www.inetbio.org/xoonet/), constructed by integrating heterogeneous types of genomics data derived from Xoo and other bacterial species. XooNet contains 106,000 functional links, which cover approximately 83% of the coding genome. XooNet is highly predictive for diverse biological processes in Xoo and can accurately reconstruct cellular pathways regulated by two-component signaling transduction systems (TCS). XooNet will be a useful in silico research platform for genetic dissection of virulence pathways in Xoo.
Kim, Hanhae,Joe, Anna,Lee, Muyoung,Yang, Sunmo,Ma, Xiaozhi,Ronald, Pamela C.,Lee, Insuk Korean Society for Molecular and Cellular Biology 2019 Molecules and cells Vol.42 No.2
Bacterial species in the genus Xanthomonas infect virtually all crop plants. Although many genes involved in Xanthomonas virulence have been identified through molecular and cellular studies, the elucidation of virulence-associated regulatory circuits is still far from complete. Functional gene networks have proven useful in generating hypotheses for genetic factors of biological processes in various species. Here, we present a genome-scale co-functional network of Xanthomonas oryze pv. oryzae (Xoo) genes, XooNet (www.inetbio.org/xoonet/), constructed by integrating heterogeneous types of genomics data derived from Xoo and other bacterial species. XooNet contains 106,000 functional links, which cover approximately 83% of the coding genome. XooNet is highly predictive for diverse biological processes in Xoo and can accurately reconstruct cellular pathways regulated by two-component signaling transduction systems (TCS). XooNet will be a useful in silico research platform for genetic dissection of virulence pathways in Xoo.
송민영,전종성,김치열,한무호,류학승,이상규,Li Sun,Zuhua He,서영수,Patrick Canal,Pamela C. Ronald 한국분자세포생물학회 2013 Molecules and cells Vol.35 No.4
The required for Mla12 resistance (RAR1) protein is essential for the plant immune response. In rice, a model monocot species, the function of Oryza sativa RAR1 (OsRAR1) has been little explored. In our current study, we characterized the response of a rice osrar1 T-DNA insertion mutant to infection by Magnaporthe oryzae, the causal agent of rice blast disease. osrar1 mutants displayed reduced resistance compared with wild type rice when inoculated with the normally virulent M. oryzae isolate PO6-6, indicating that OsRAR1 is required for an immune response to this pathogen. We also investigated the function of OsRAR1 in the resistance mechanism mediated by the immune receptor genes Pib and Pi5 that encode nucleotide binding-leucine rich repeat (NB-LRR) proteins. We inoculated progeny from Pib/osrar1 and Pi5/osrar1 heterozygous plants with the avirulent M. oryzae isolates, race 007 and PO6-6, respectively. We found that only Pib-mediated resistance was compromised by the osrar1 mutation and that the introduction of the OsRAR1 cDNA into Pib/osrar1 rescued Pib-mediated resistance. These results indicate that OsRAR1 is required for Pib-mediated resistance but not Pi5-mediated resistance to M. oryzae.