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Genomic distribution and characterization of EST-derived resistance gene analogs (RGAs) in sugarcane

文献类型： 外文期刊

作者： Rossi, M 1 ; Araujo, PG 2 ; Paulet, F 2 ; Garsmeur, O 2 ; Dias, VM 2 ; Chen, H 2 ; Van Sluys, MA 2 ; D'Hont, A 2 ;

作者机构： 1.CIRAD, UMR1096, F-34398 Montpellier 5, France

2.CIRAD, UMR1096, F-34398 Montpellier 5, France; Univ Sao Paulo, Inst Biociencias, Dept Bot, BR-05508009 Sao Paulo, Brazil; Yunnan Acad Agr Sci, Yunnan Sugarcane Res Inst, Kaiyuan 661600, Yunnan, Peoples R China

关键词： sugarcane;polyploid;genetic mapping;resistance gene analogs (RGAs);nucleotide binding site/leucine rich repeat (NBS/LRR)

期刊名称：MOLECULAR GENETICS AND GENOMICS （ 影响因子：3.291； 五年影响因子：3.257 ）

ISSN： 1617-4615

年卷期： 2003 年 269 卷 3 期

页码：

收录情况： SCI

摘要： A large sugarcane EST (expressed sequence tag) project recently gave us access to 261,609 EST sequences from sugarcane, assembled into 81,223 clusters. Among these, we identified 88 resistance gene analogs (RGAs) based on their homology to typical pathogen resistance genes, using a stringent BLAST search with a threshold e-value of e(-50). They included representatives of the three major groups of resistance genes with NBS/LRR, LRR or S/T KINASE domains. Fifty RGAs showed a total of 148 single-dose polymorphic RFLP markers, which could be located on the sugarcane reference genetic map (constructed in cultivar R570, 2n=similar to115). Fifty-five SSR loci corresponding to 134 markers in R570 were also mapped to enable the classification of the various haplotypes into homology groups. Several RGA clusters were found. One cluster of two LRR-like loci mapped close to the only disease resistance gene known so far in sugarcane, which confers resistance to common rust. Detailed sequence comparison between two NBS/LRR RGA clusters in relation to their orthologs in rice and maize suggests their polyphyletic origins, and indicates that the degree of divergence between paralogous RGAs in sugarcane can be larger than that from an ortholog in a distant species.

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