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排序方式: 共有433条查询结果,搜索用时 31 毫秒
71.
Daryl L. Klindworth Jyoti Saini Yunming Long Matthew N. Rouse Justin D. Faris Yue Jin Steven S. Xu 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2017,130(6):1135-1154
Key message
Markers linked to stem rust resistance gene Sr47 were physically mapped in three small Aegilops speltoides chromosomal bins. Five markers, including two PCR-based SNP markers, were validated for marker-assisted selection.Abstract
In durum wheat (Triticum turgidum subsp. durum), the gene Sr47 derived from Aegilops speltoides conditions resistance to race TTKSK (Ug99) of the stem rust pathogen (Puccinia graminis f. sp. tritici). Sr47 is carried on small interstitial translocation chromosomes (Ti2BL-2SL-2BL·2BS) in which the Ae. speltoides chromosome 2S segments are divided into four bins in genetic stocks RWG35, RWG36, and RWG37. Our objective was to physically map molecular markers to bins and to determine if any of the molecular markers would be useful in marker-assisted selection (MAS). Durum cultivar Joppa was used as the recurrent parent to produce three BC2F2 populations. Each BC2F2 plant was genotyped with markers to detect the segment carrying Sr47, and stem rust testing of BC2F3 progeny with race TTKSK confirmed the genotyping. Forty-nine markers from published sources, four new SSR markers, and five new STARP (semi-thermal asymmetric reverse PCR) markers, were evaluated in BC2F2 populations for assignment of markers to bins. Sr47 was mapped to bin 3 along with 13 markers. No markers were assigned to bin 1; however, 7 and 13 markers were assigned to bins 2 and 4, respectively. Markers Xrwgs38a, Xmag1729, Xwmc41, Xtnac3119, Xrwgsnp1, and Xrwgsnp4 were found to be useful for MAS of Sr47. However, STARP markers Xrwgsnp1 and Xrwgsnp4 can be used in gel-free systems, and are the preferred markers for high-throughput MAS. The physical mapping data from this study will also be useful for pyramiding Sr47 with other Sr genes on chromosome 2B.72.
73.
Kim B Sarangi PP Azkur AK Kaistha SD Rouse BT 《Microbes and infection / Institut Pasteur》2008,10(3):302-312
Herpes simplex virus (HSV) infection of the cornea culminates in an immunopathological lesion (stromal keratitis--SK) that impairs vision. This report shows that HSV infection results in IL-23 up-regulation, but if this response fails to occur, as was noted in p19-/- mice, the severity of lesions, their incidence and the level of viral induced angiogenesis were significantly increased compared to wild-type (WT) animals (p<0.05). The higher disease severity in p19-/- mice appeared to be the consequence of an increased IL-12 response that in turn led to the induction of higher numbers of IFN-gamma producing CD4(+)T cells, the principal orchestrators of SK. Our results indicate that the severity of HSV induced immunopathological lesions may be mainly the consequence of IL-12 driven Th1 T cell reactions rather than the action of IL-17 producing cells controlled by IL-23. 相似文献
74.
Mark A. Seefeld Meagan B. Rouse Kenneth C. McNulty Lihui Sun Jizhou Wang Dennis S. Yamashita Juan I. Luengo ShuYun Zhang Elisabeth A. Minthorn Nestor O. Concha Dirk A. Heerding 《Bioorganic & medicinal chemistry letters》2009,19(8):2244-2248
A pyrrolopyridinyl thiophene carboxamide 7 was discovered as a tractable starting point for a lead optimization effort in an AKT kinase inhibition program. SAR studies aided by a co-crystal structure of 7 in AKT2 led to the identification of AKT inhibitors with subnanomolar potency. Representative compounds showed antiproliferative activity as well as inhibition of phosphorylation of the downstream target GSK3β. 相似文献
75.
We review the taxonomic history of pogonophores (frenulates and vestimentiferans), from the species in first described 1914 to the recently described bone-eating worm Osedax. Previous systematists have referred both groups to the rank of phylum, and the animals have been treated as deuterostomes with a dorsal nerve cord. Further knowledge on their embryology, the discovery of the previously overlooked posterior, segmented part provided with chaetae, and access to molecular data, have completely changed earlier views on their affinities. They are now referred to as a single family of polychaete annelids, Siboglinidae. To cite this article: F. Pleijel et al., C. R. Biologies 332 (2009). 相似文献
76.
77.
Eric E. Lopez-Vera Sarah Nelson Ravi P. Singh Bhoja R. Basnet Scott D. Haley Sridhar Bhavani Julio Huerta-Espino Beatriz G. Xoconostle-Cazares Roberto Ruiz-Medrano Matthew N. Rouse Sukhwinder Singh 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2014,127(1):231-239
Key message
Identified SSR markers ( Xcfd49 and Xbarc183 ) linked with stem rust resistance for efficient use in marker-assisted selection and stacking of resistance genes in wheat breeding programs.Abstract
More than 80 % of the worldwide wheat (Triticum aestivum L.) area is currently sown with varieties susceptible to the Ug99 race group of stem rust fungus. However, wheat lines Niini, Tinkio, Coni, Pfunye, Blouk, and Ripper have demonstrated Ug99 resistance at the seedling and adult plant stages. We mapped stem rust resistance in populations derived from crosses of a susceptible parent with each of the resistant lines. The segregation of resistance in each population indicated the presence of a single gene. The resistance gene in Niini mapped to short arm of chromosome 6D and was flanked by SSR markers Xcfd49 at distances of 3.9 cM proximal and Xbarc183 8.4 cM distal, respectively. The chromosome location of this resistance was validated in three other populations: PBW343/Coni, PBW343/Tinkio, and Cacuke/Pfunye. Resistance initially postulated to be conferred by the SrTmp gene in Blouk and Ripper was also linked to Xcfd49 and Xbarc183 on 6DS, but it was mapped proximal to Xbarc183 at a similar position to previously mapped genes Sr42 and SrCad. Based on the variation in diagnostic marker alleles, it is possible that Niini and Pfunye may carry different resistance genes/alleles. Further studies are needed to determine the allelic relationships between various genes located on chromosome arm 6DS. Our results provide valuable molecular marker and genetic information for developing Ug99 resistant wheat varieties in diverse germplasm and using these markers to tag the resistance genes in wheat breeding. 相似文献78.
Matthew N. Rouse Jayaveeramuthu Nirmala Yue Jin Shiaoman Chao Thomas G. Fetch Jr. Zacharias A. Pretorius Colin W. Hiebert 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2014,127(8):1681-1688
Key message
Wheat stem rust resistance gene SrWeb is an allele at the Sr9 locus that confers resistance to Ug99.Abstract
Race TTKSK (Ug99) of Puccinia graminis f. sp. tritici, the causal fungus of stem rust, threatens global wheat production because of its broad virulence to current wheat cultivars. A recently identified Ug99 resistance gene from cultivar Webster, temporarily designated as SrWeb, mapped near the stem rust resistance gene locus Sr9. We determined that SrWeb is also present in Ug99 resistant cultivar Gabo 56 by comparative mapping and an allelism test. Analysis of resistance in a population segregating for both Sr9e and SrWeb demonstrated that SrWeb is an allele at the Sr9 locus, which subsequently was designated as Sr9h. Webster and Gabo 56 were susceptible to the Ug99-related race TTKSF+ from South Africa. Race TTKSF+ possesses unique virulence to uncharacterized Ug99 resistance in cultivar Matlabas. This result validated that resistance to Ug99 in Webster and Gabo 56 is conferred by the same gene: Sr9h. The emergence of pathogen virulence to several resistance genes that are effective to the original Ug99 race TTKSK, including Sr9h, suggests that resistance genes should be used in combinations in order to increase resistance durability. 相似文献79.
Kristin Simons Zewdie Abate Shiaoman Chao Wenjun Zhang Matt Rouse Yue Jin Elias Elias Jorge Dubcovsky 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2011,122(3):649-658
Wheat stem rust caused by Puccinia graminis f. sp. tritici, can cause significant yield losses. To combat the disease, breeders have deployed resistance genes both individually and
in combinations to increase resistance durability. A new race, TTKSK (Ug99), identified in Uganda in 1999 is virulent on most
of the resistance genes currently deployed, and is rapidly spreading to other regions of the world. It is therefore important
to identify, map, and deploy resistance genes that are still effective against TTKSK. One of these resistance genes, Sr13, was previously assigned to the long arm of chromosome 6A, but its precise map location was not known. In this study, the
genome location of Sr13 was determined in four tetraploid wheat (T. turgidum ssp. durum) mapping populations involving the TTKSK resistant varieties Kronos, Kofa, Medora and Sceptre. Our results showed that resistance
was linked to common molecular markers in all four populations, suggesting that these durum lines carry the same resistance
gene. Based on its chromosome location and infection types against different races of stem rust, this gene is postulated to
be Sr13. Sr13 was mapped within a 1.2–2.8 cM interval (depending on the mapping population) between EST markers CD926040 and BE471213, which corresponds to a 285-kb region in rice chromosome 2, and a 3.1-Mb region in Brachypodium chromosome 3. These maps will be the foundation for developing high-density maps, identifying diagnostic markers, and positional
cloning of Sr13. 相似文献
80.
Reddy PB Sehrawat S Suryawanshi A Rajasagi NK Mulik S Hirashima M Rouse BT 《Journal of immunology (Baltimore, Md. : 1950)》2011,187(11):5745-5755
After HSV-1 infection, CD8(+) T cells accumulate in the trigeminal ganglion (TG) and participate in the maintenance of latency. However, the mechanisms underlying intermittent virus reactivation are poorly understood. In this study, we demonstrate the role of an inhibitory interaction between T cell Ig and mucin domain-containing molecule 3 (Tim-3)-expressing CD8(+) T cells and galectin 9 (Gal-9) that could influence HSV-1 latency and reactivation. Accordingly, we show that most K(b)-gB tetramer-specific CD8(+) T cells in the TG of HSV-1-infected mice express Tim-3, a molecule that delivers negative signals to CD8(+) T cells upon engagement of its ligand Gal-9. Gal-9 was also upregulated in the TG when replicating virus was present as well during latency. This could set the stage for Gal-9/Tim-3 interaction, and this inhibitory interaction was responsible for reduced CD8(+) T cell effector function in wild-type mice. Additionally, TG cell cultures exposed to recombinant Gal-9 in the latent phase caused apoptosis of most CD8(+) T cells. Furthermore, Gal-9 knockout TG cultures showed delayed and reduced viral reactivation as compared with wild-type cultures, demonstrating the greater efficiency of CD8(+) T cells to inhibit virus reactivation in the absence of Gal-9. Moreover, the addition of recombinant Gal-9 to ex vivo TG cultures induced enhanced viral reactivation compared with untreated controls. Our results demonstrate that the host homeostatic mechanism mediated by Gal-9/Tim-3 interaction on CD8(+) T cells can influence the outcome of HSV-1 latent infection, and manipulating Gal-9 signals might represent therapeutic means to inhibit HSV-1 reactivation from latency. 相似文献