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Lee, Michael; Sharopova, Natalya; Beavis, William D.; Grant, David M.; Katt, Maria; Blair, D. S.; Hallauer, Arnel R.

doi:10.1023/a:1014893521186

Cited by 357 publications

(130 citation statements)

References 11 publications

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“…Gel blot analysis was performed with three different families derived from crosses between B73 (Rxo1) and Mo17 (rxo1): 131 recombinant inbred lines (RILs), 150 (rxo1͞rxo1) individuals from an F 2 family, and 219 RILs from a family derived from multiple cycles of intercrossing. The latter family exhibits a Ͼ3-fold increase in recombination compared with F 2 individuals because of the cycles of intercrossing (29). Digestion with BglII generated five restriction fragments from B73 that could be distinguished from Mo17 fragments.…”

Section: Resultsmentioning

confidence: 99%

A maize resistance gene functions against bacterial streak disease in rice

Zhao

Lin

Poland

et al. 2005

Proc. Natl. Acad. Sci. U.S.A.

226

146

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Although cereal crops all belong to the grass family (Poacea), most of their diseases are specific to a particular species. Thus, a given cereal species is typically resistant to diseases of other grasses, and this nonhost resistance is generally stable. To determine the feasibility of transferring nonhost resistance genes (R genes) between distantly related grasses to control specific diseases, we identified a maize R gene that recognizes a rice pathogen, Xanthomonas oryzae pv. oryzicola, which causes bacterial streak disease. Bacterial streak is an important disease of rice in Asia, and no simply inherited sources of resistance have been identified in rice. Although X. o. pv. oryzicola does not cause disease on maize, we identified a maize gene, Rxo1, that conditions a resistance reaction to a diverse collection of pathogen strains. Surprisingly, Rxo1 also controls resistance to the unrelated pathogen Burkholderia andropogonis, which causes bacterial stripe of sorghum and maize. The same gene thus controls resistance reactions to both pathogens and nonpathogens of maize. Rxo1 has a nucleotide-binding siteleucine-rich repeat structure, similar to many previously identified R genes. Most importantly, Rxo1 functions after transfer as a transgene to rice, demonstrating the feasibility of nonhost R gene transfer between cereals and providing a valuable tool for controlling bacterial streak disease.disease resistance ͉ nonhost resistance ͉ Xanthomonas

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Section: Resultsmentioning

confidence: 99%

A maize resistance gene functions against bacterial streak disease in rice

Zhao

Lin

Poland

et al. 2005

Proc. Natl. Acad. Sci. U.S.A.

226

146

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“…The Y1 gene and the outer low copy regions, PCO131338 and sbe1 were mapped on 279 individuals of the intermated B73 ϫ Mo17 population (10). The B73 inbred line contained a 346-bp Tourist element within the Y1 gene, whereas the Mo17 did not, enabling the indel to be typed using agarose gel electrophoresis.…”

Section: Shotgun Sequencing Of Y1-containing Bacterial Artificial Chrmentioning

confidence: 99%

Section: Patterns Of Diversity Surrounding Y1mentioning

confidence: 99%

“…The Y1 gene and the outer low copy regions, PCO131338 and sbe1, were genetically mapped on 279 individuals of the high-resolution intermated B73 ϫ Mo17 recombinant inbred population (10). The genetic distances in this population are expanded Ϸ4 fold (10,22). There were 8.5 recombinants between PCO131338 and Y1, 5 between Y1 and sbe1, and 8.5 between PCO131338 and sbe1, the outer regions of the area in question (for the explanation of scoring method, see Materials and Methods).…”

Section: Patterns Of Diversity Surrounding Y1mentioning

confidence: 99%

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Long-range patterns of diversity and linkage disequilibrium surrounding the maize Y1 gene are indicative of an asymmetric selective sweep

Palaisa

Morgante

Tingey

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

205

153

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Both yellow and white corn occurs among ancestral open pollinated varieties. More recently, breeders have selected yellow endosperm variants of maize over ancestral white phenotypes for their increased nutritional value resulting from the up-regulation of the Y1 phytoene synthase gene product in endosperm tissue. As a result, diversity within yellow maize lines at the Y1 gene is dramatically decreased as compared to white corn. We analyzed patterns of sequence diversity and linkage disequilibrium in nine low copy regions located at varying distances from the Y1 gene, including a homolog of the barley Mlo gene. Patterns consistent with a selective sweep, such as significant associations of informative single-nucleotide polymorphisms with endosperm color phenotype, linkage disequilibrium, and significantly reduced diversity within the yellow endosperm haplotypes, were observed up to 600 kb downstream of Y1, whereas the upstream region showed a more rapid recovery. The starch branching enzyme 1 (sbe1) gene is the first region downstream of Y1 that does not have a highly conserved haplotype in the yellow endosperm germplasm.S elective forces acting on allelic variants of genes have a profound effect on local levels of genetic diversity and linkage disequilibria (LD). Positive directional selection leads to reduced variability and increased LD in the respective region (1-6), and the so-called selective sweep regions provide clues to genes that have been subjects of evolutionary forces as well as selection by humans. Recently, Clark et al. (7) characterized a selective sweep in the promoter region of teosinte branched1 (tb1). The sweep extends 60-90 kb upstream of the gene and is indicative of the gene's role in the domestication of maize from teosinte between 6,000 and 10,000 years ago.The maize Y1 gene on chromosome 6 has undergone recent selection for endosperm color phenotype. A recent study (8) uncovered a dramatic reduction in diversity at this gene for the yellow endosperm maize inbred lines only, over the entire 6-kb gene region. This footprint of selection was characterized by a conserved yellow endosperm haplotype at the 5Ј end of the gene with evidence of recombination toward the 3Ј end. Strong haplotype conservation at the 5Ј end is suggestive of the location of the causal variant associated with the gain-of-function mutation to yellow endosperm and may be indicative of further extension of the selective sweep in the 5Ј direction. The presence of recombinants in the 3Ј UTR region, however, suggested that the extent of the selective sweep may be limited downstream of the coding region.The white endosperm lines did not show characteristics of a selective sweep (8), despite the fact that the white endosperm phenotype is also a target of selection due to human taste preference (9). This is because white is the predicted ancestral state of the gene (John Doebley, personal communication), and thus multiple haplotypes are associated with the white endosperm phenotype.Understanding the boundaries of the selective ...

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“…This is in accordance with previous observations on Arabidopsis thaliana (Liu et al 1996) and LHRF is to our knowledge the only other maize IRIL population publicly available. This resource allowed us maize (Beavis et al 1992;Lee et al 2002). However, the length of the IBM2 framework map from the MMP (see to map 30% more cDNAs than could be achieved with IBM alone.…”

Section: Simulation Of Genotyping Errorsmentioning

confidence: 99%

Linkage Mapping of 1454 New Maize Candidate Gene Loci

et al. 2005

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Bioinformatic analyses of maize E S T sequences have highlighted large numbers of candidate genes putatively involved in agriculturally important traits. To contribute to ongoing efforts toward mapping of these genes, we used two populations of intermated recombinant inbred lines (IRILs), which allow a higher map resolution than nonintermated RIL s. The first panel (IBM), derived from B73 ϫ Mo17, is publicly available from the Maize Genetics Cooperation Stock Center. The second panel (LHRF) was developed from F2 ϫ F252 to map loci monomorphic on IBM. We built framework maps of 237 loci from the IBM panel and 271 loci from the LHRF panel. Both maps were used to place 1454 loci (1056 on map IBM_Gnp2004 and 398 on map LHRF_Gnp2004) that corresponded to 954 cDNA probes previously unmapped. RFLP was mostly used, but PCR-based methods were also performed for some cDNAs to map SNPs. Unlike in usual IRIL-based maps published so far, corrected meiotic centimorgan distances were calculated, taking into account the number of intermating generations undergone by the IRIL s. The corrected sizes of our framework maps were 1825 cM for IBM_Gnp2004 and 1862 cM for LHRF_Gnp2004. All loci mapped on LHRF_Gnp2004 were also projected on a consensus map IBMconsensus_Gnp2004. cDNA loci formed clusters near the centromeres except for chromosomes 1 and 8.

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Untitled

Cited by 357 publications

References 11 publications

A maize resistance gene functions against bacterial streak disease in rice

A maize resistance gene functions against bacterial streak disease in rice

Long-range patterns of diversity and linkage disequilibrium surrounding the maize Y1 gene are indicative of an asymmetric selective sweep

Linkage Mapping of 1454 New Maize Candidate Gene Loci

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