Coincidence in map positions between pathogen-induced defense-responsive genes and quantitative resistance loci in rice

Xiong, Min; Wang, Sniping; Zhang, Qifa

doi:10.1360/02yc9057

Cited by 9 publications

(12 citation statements)

References 16 publications

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“…Wang et al (2001) reported that the locations of several rice ESTs (expressed sequence tags) with defense-response gene-like sequences were associated with previously identified resistance QTLs for rice diseases. Xiong et al (2002) showed that the locations of more than 20 defense-responsive genes induced by pathogen infection were near resistance QTLs for different rice diseases. In this study, the chromosomal locations and pathogen specificities of seven sequences, EI12I1, BI26N5, EI35I3, EI1K8, EI10P9, EI5P11 and EI13J2, corresponded well with those of previously identified blast resistance QTLs (Wang et al 1994;Chen et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Three types of defense-responsive genes are involved in resistance to bacterial blight and fungal blast diseases in rice

2003

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Bacterial blight and fungal blast diseases of rice, caused by Xanthomonas oryzae pv. oryzae and Pyricularia grisea Sacc., respectively, are two of the most devastating diseases in rice worldwide. To study the defense responses to infection with each of these pathogens, expression profiling of 12 defense-responsive genes was performed using near-isogenic rice lines that are resistant or susceptible to bacterial blight and fungal blast, respectively, and rice cultivars that are resistant or susceptible to both pathogens. All 12 genes showed constitutive expression, but expression levels increased in response to infection. Based on their expression patterns in 12 host-pathogen combinations, these genes could be classified into three types, pathogen non-specific (6), pathogen specific but race non-specific (4) and race specific (2). Most of the 12 genes were only responsive during incompatible interactions. These results suggest that bacterial blight and fungal blast resistances share common pathway(s), but are also regulated by different defense pathways in rice. Activation of the corresponding R gene is the key step that initiates the action of these genes in defense responses. The chromosomal locations and pathogen specificities of seven of the 12 genes were consistent with those of previously identified quantitative trait loci for rice disease resistance, which indicates that some of the 12 genes studied may have a phenotypic impact on disease resistance in rice.

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Section: Discussionmentioning

confidence: 99%

Three types of defense-responsive genes are involved in resistance to bacterial blight and fungal blast diseases in rice

2003

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“…The triangles in the bacterial blight resistance and blast resistance QTLs, detected using the same population as was used to construct the framework map, indicate the logarithm-of-odds peaks of the resistance effects. The filled circles represent the centromeric regions identified previously (Wang et al 2000a) co-localize with resistance QTLs identified in barley, bean, rice and potato (Faris et al 1999;Geffroy et al 2000;Trognitz et al, 2002;Xiong et al 2002;Ramalingam et al 2003). Thus, the candidate-gene approach may provide a means for pinpointing the genes that underlie resistance QTLs.…”

Section: Analyses Of the Sequences And Expression Patterns Of Defensementioning

confidence: 99%

“…Recent studies have shown that some defense-responsive genes are located in the vicinity of quantitative trait loci (QTLs) for disease resistances in different plant species (Faris et al 1999;Wang et al 2001;Xiong et al 2002;Ramalingam et al 2003;Wen et al 2003). QTLs for quantitative disease resistance are generally considered to be valuable sources of broad-spectrum and durable resistance in rice breeding programs (Roumen 1994).…”

Section: Introductionmentioning

confidence: 99%

Genome-wide analysis of defense-responsive genes in bacterial blight resistance of rice mediated by the recessive R gene xa13

et al. 2004

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Defense responses triggered by dominant and recessive disease resistance (R) genes are presumed to be regulated by different molecular mechanisms. In order to characterize the genes activated in defense responses against bacterial blight mediated by the recessive R gene xa13, two pathogen-induced subtraction cDNA libraries were constructed using the resistant rice line IRBB13--which carries xa13--and its susceptible, near-isogenic, parental line IR24. Clustering analysis of expressed sequence tags (ESTs) identified 702 unique expressed sequences as being involved in the defense responses triggered by xa13; 16% of these are new rice ESTs. These sequences define 702 genes, putatively encoding a wide range of products, including defense-responsive genes commonly involved in different host-pathogen interactions, genes that have not previously been reported to be associated with pathogen-induced defense responses, and genes (38%) with no homology to previously described functional genes. In addition, R-like genes putatively encoding nucleotide-binding site/leucine rich repeat (NBS-LRR) and LRR receptor kinase proteins were observed to be induced in the disease resistance activated by xa13. A total of 568 defense-responsive ESTs were mapped to 588 loci on the rice molecular linkage map through bioinformatic analysis. About 48% of the mapped ESTs co-localized with quantitative trait loci (QTLs) for resistance to various rice diseases, including bacterial blight, rice blast, sheath blight and yellow mottle virus. Furthermore, some defense-responsive sequences were conserved at similar locations on different chromosomes. These results reveal the complexity of xa13-mediated resistance. The information obtained in this study provides a large source of candidate genes for understanding the molecular bases of defense responses activated by recessive R genes and of quantitative disease resistance.

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“…In recent years, large numbers of defense-responsive genes have been identified to be involved in the incompatible interaction between rice and Xoo or M. grisea (Zhou et al, 2002;Chu et al, 2004). However, the impact of each of these defenseresponsive genes on rice disease resistance is unknown, except for the knowledge that some of these genes colocalize with quantitative trait loci (QTLs) for rice disease resistance (Wang et al, 2001;Xiong et al, 2002;Ramalingam et al, 2003;Wen et al, 2003;Chu et al, 2004). Thus, the values of these genes in the improvement of disease resistance for rice breeding need to be explored.…”

Section: Introductionmentioning

confidence: 99%

Dual Function of Rice OsDR8 Gene in Disease Resistance and Thiamine Accumulation

et al. 2006

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The function of OsDR8, a rice disease resistance-responsive gene, was studied. Silencing of OsDR8 using an RNA interference approach resulted in phenotypic alteration of the plants. The transgenic plants with repressed expression of OsDR8 showed reduced resistance or susceptibility to Xanthomonas oryzae pv. oryzae and Magnaporthe grisea causing bacterial blight and blast, which are two of the most devastating diseases in rice worldwide, respectively. The putative product of OsDR8 was highly homologous to an enzyme involved in the biosynthesis of the thiazole precursor of thiamine. Transgenic plants showing repressed expression of OsDR8 and reduced resistance had significantly lower levels of thiamine than the control plants. Exogenous application of thiamine could complement the compromised defense of the OsDR8-silenced plants. The expression level of several defense-responsive genes including the earlier functional genes of defense transduction pathway, OsPOX and OsPAL, and the downstream genes of the pathway, OsPR1a, OsPR1b, OsPR4, OsPR5 and OsPR10, was also decreased in the OsDR8-silenced plants. These results suggest that the impact of OsDR8 on disease resistance in rice may be through the regulation of expression of other defense-responsive genes and the site of OsDR8 function is on the upstream of the signal transduction pathway. In addition, the accumulation of thiamine may be essential for bacterial blight resistance and blast resistance.

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Coincidence in map positions between pathogen-induced defense-responsive genes and quantitative resistance loci in rice

Cited by 9 publications

References 16 publications

Three types of defense-responsive genes are involved in resistance to bacterial blight and fungal blast diseases in rice

Three types of defense-responsive genes are involved in resistance to bacterial blight and fungal blast diseases in rice

Genome-wide analysis of defense-responsive genes in bacterial blight resistance of rice mediated by the recessive R gene xa13

Dual Function of Rice OsDR8 Gene in Disease Resistance and Thiamine Accumulation

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