Registration of ‘Cybonnet’ Rice

Gibbons, J.W.; Moldenhauer, K. A. K.; Gravois, K. A.; Lee, F.N.; Bernhardt, J. L.; Meullenet, Jean‐François; Anders, Merle M.; Norman, Richard; Cartwright, R. D.; Taylor, Kathryn; Bulloch, J. M.; Blocker, M. M.

doi:10.2135/cropsci2006.03.0173

Cited by 21 publications

(23 citation statements)

References 3 publications

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“…Our genotyping results are 100% concordant with the introgression results and prior knowledge about which varieties carry the Pi-ta resistance allele (G-allele), including variety registration records [47], [62]–[64].…”

Section: Resultssupporting

confidence: 78%

“…Using the GoldenGate assay, we document that there is highly elevated introgression from indica into many tropical japonica varieties near the SD1 gene (Figure 2) in agreement with the historical record (Figure 3) [44]. These varieties include Cypress [45], Lemont [46], Cocodrie [45], Cybonnet [47], Rosemont [48], Jefferson [49], all of which are known to be semi-dwarf plants. Four semi-dwarf admixed accessions, including Berenj, Bengal, M202 and Saber also showed an indica introgression in the region.…”

Section: Resultssupporting

confidence: 72%

See 1 more Smart Citation

Genomic Diversity and Introgression in O. sativa Reveal the Impact of Domestication and Breeding on the Rice Genome

et al. 2010

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BackgroundThe domestication of Asian rice (Oryza sativa) was a complex process punctuated by episodes of introgressive hybridization among and between subpopulations. Deep genetic divergence between the two main varietal groups (Indica and Japonica) suggests domestication from at least two distinct wild populations. However, genetic uniformity surrounding key domestication genes across divergent subpopulations suggests cultural exchange of genetic material among ancient farmers.Methodology/Principal FindingsIn this study, we utilize a novel 1,536 SNP panel genotyped across 395 diverse accessions of O. sativa to study genome-wide patterns of polymorphism, to characterize population structure, and to infer the introgression history of domesticated Asian rice. Our population structure analyses support the existence of five major subpopulations (indica, aus, tropical japonica, temperate japonica and GroupV) consistent with previous analyses. Our introgression analysis shows that most accessions exhibit some degree of admixture, with many individuals within a population sharing the same introgressed segment due to artificial selection. Admixture mapping and association analysis of amylose content and grain length illustrate the potential for dissecting the genetic basis of complex traits in domesticated plant populations.Conclusions/SignificanceGenes in these regions control a myriad of traits including plant stature, blast resistance, and amylose content. These analyses highlight the power of population genomics in agricultural systems to identify functionally important regions of the genome and to decipher the role of human-directed breeding in refashioning the genomes of a domesticated species.

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Section: Resultssupporting

confidence: 78%

Section: Resultssupporting

confidence: 72%

Genomic Diversity and Introgression in O. sativa Reveal the Impact of Domestication and Breeding on the Rice Genome

et al. 2010

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“…The landraces Tadukan and Tetep, containing Pi-ta and other blast R genes in chromosome 12, have been used as breeding parents for preventing blast disease worldwide. Tadukan was confirmed to be the Pita donor for various Asian japonica cultivars (Rybka et al 1997) whereas Tetep was the Pi-ta donor for the U. S. cultivars (Gravois et al 1995;Moldenhauer et al 1998;McClung et al 1999;Gibbons et al 2006;Moldenhauer et al 2007). Recently, the large introgressed chromosomal segments surrounding the Pi-ta locus were identified in backcross BC 5 progenies and elite rice cultivars ( Jia 2009).…”

Section: P Lant Resistance (R) Genes Have Evolved To Fightmentioning

confidence: 99%

Evolutionary Dynamics of the Genomic Region Around the Blast Resistance Gene Pi-ta in AA Genome Oryza Species

et al. 2009

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The race-specific resistance gene Pi-ta has been effectively used to control blast disease, one of the most destructive plant diseases worldwide. A single amino acid change at the 918 position of the Pi-ta protein was known to determine resistance specificity. To understand the evolutionary dynamics present, we examined sequences of the Pi-ta locus and its flanking regions in 159 accessions composed of seven AA genome Oryza species: O. sativa, O. rufipogon, O. nivara, O. meridionalis, O. glaberrima, O. barthii, and O. glumaepatula. A 3364-bp fragment encoding a predicted transposon was found in the proximity of the Pi-ta promoter region associated with the resistance phenotype. Haplotype network analysis with 33 newly identified Pi-ta haplotypes and 18 newly identified Pi-ta protein variants demonstrated the evolutionary relationships of Pi-ta haplotypes between O. sativa and O. rufipogon. In O. rufipogon, the recent directional selection was found in the Pi-ta region, while significant deviation from neutral evolution was not found in all O. sativa groups. Results of sequence variation in flanking regions around Pi-ta in O. sativa suggest that the size of the resistant Pi-ta introgressed block was at least 5.4 Mb in all elite resistant cultivars but not in the cultivars without Pi-ta. These findings demonstrate that the Pi-ta region with transposon and additional plant modifiers has evolved under an extensive selection pressure during crop breeding.

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“…These perfect markers are robust and easy to use for marker-assisted selection. In the southern US, rice cultivars with the Pi-ta gene are: Katy (Moldenhauer et al, 1990), Drew (Moldenhauer et al, 1998), Kaybonnet (Gravois et al, 1995), Madison (McClung et al, 1999), Cybonnet (Gibbons et al, 2006), Spring (Moldenhauer et al, 2007a), Banks (Moldenhauer et al, 2007b) and Ahrent (Moldenhauer et al, 2007c). The perfect markers for Pi-ta (Jia et al, 2002;Jia et al, 2004) were used for the development of some of these cultivars, and were used to verify the Pi-ta gene in all Pi-ta containing cultivars.…”

Section: The O Sativa -M Oryzae Interactionmentioning

confidence: 99%

Current progress on genetic interactions of rice with rice blast and sheath blight fungi

Jia

Liu²,

Costanzo

et al. 2009

Front. Agric. China

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Analysis of genetic interactions between rice and its pathogenic fungi Magnaporthe oryzae and Rhizoctonia solani should lead to a better understanding of molecular mechanisms of host resistance, and the improvement of strategies to manage rice blast and sheath blight diseases. Currently, dozens of rice resistance (R) genes against specific races of the blast fungus have been described. Among them, ten were molecularly characterized and some were widely used for breeding for genetic resistance. The Pi-ta gene was one of the best characterized rice R genes. Following the elucidation of its molecular structure, interaction, distribution, and evolution, user friendly DNA markers were developed from portions of the cloned genes to facilitate the incorporations of the Pi-ta mediated resistance into improved rice varieties using marker assisted selection (MAS). However, rice blast is still a major threat for stable rice production because of race change mutations occurring in rice fields, which often overcome added resistance based on single R genes, and these virulent races of M. oryzae pose a continued challenge for blast control. For sheath blight, progress has been made on the exploration of novel sources of resistance from wild rice relatives and indica rice cultivars. A major quantitative trait locus (QTL), named qSB9-2, was recently verified in several mapping populations with different phenotyping methods, including greenhouse methods. The ability to identify qSB9-2 using greenhouse methods should accelerate the efforts on the qSB9-2 fine mapping and positional cloning.

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Registration of ‘Cybonnet’ Rice

Cited by 21 publications

References 3 publications

Genomic Diversity and Introgression in O. sativa Reveal the Impact of Domestication and Breeding on the Rice Genome

Genomic Diversity and Introgression in O. sativa Reveal the Impact of Domestication and Breeding on the Rice Genome

Evolutionary Dynamics of the Genomic Region Around the Blast Resistance Gene Pi-ta in AA Genome Oryza Species

Current progress on genetic interactions of rice with rice blast and sheath blight fungi

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