Microsporogenesis of <Emphasis Type="Italic">Rps</Emphasis>8/<Emphasis Type="Italic">rps</Emphasis>8 heterozygous soybean lines     

Maria Andrea Ortega  Anne E. Dorrance 《Euphytica》2011,181(1):77-88

Phytophthora root and stem rot caused by Phytophthora sojae, is one of the most damaging diseases of soybean, for which management is principally done by planting resistant cultivars with race specific resistance which are conferred by Rps (Resistance to Phytophthora sojae) genes. The Rps8 locus, identified in the South Korean landrace PI 399073, is located in a 2.23 Mbp region on soybean chromosome 13. In eight cv. Williams (rps8/rps8) × PI 399073 (Rps8/Rps8) populations, this region exhibited strong segregation distortion. In a cross between the South Korean lines PI 399073 (Rps8/Rps8) and PI 408211B (multiple Rps genes) this region segregated in a Mendelian fashion. In this study, microsporogenesis was evaluated to identify meiotic abnormalities that may be associated with the segregation distortion of the Rps8 region. Pollen was collected from greenhouse-grown plants of the parental genotypes: Williams, PI 399073, and PI 408211B; as well as selected Rps8/rps8 RILs from Williams × PI 399073 BC₄F_2:3 and PI 399073 × PI 408211B F_4:5 populations. There were no differences for pollen viability among the genotypes. However, for PI 399073, a mix of dyads, triads, tetrads and pentads was observed. A high frequency of meiotic abnormalities including fragments, laggards, multinucleated microspores; and microcytes containing DNA was also observed in Rps8/rps8 Williams × PI 399073 BC₄F_2:3 RILs. These meiotic abnormalities may contribute to the high degree of segregation distortion present in the Williams × PI 399073 populations.  相似文献   

Partial resistance toPhytophthora infestans in fourSolanum crosses     

A. E. Dorrance  D. A. Inglis  J. P. Helgeson  C. R. Brown 《American Journal of Potato Research》2001,78(1):9-17

Thirty progeny from each of fourSolanum crosses were evaluated in the field at Mount Vernon, WA, in 1996 and 1997 for partial resistance toPhytophthora infestans. Of the four parents, three have high levels of partial resistance toP. infestans; one derived from somatic hybridization ofS. bulbocastanum, the other two from traditional breeding efforts for multiple disease resistance. Data were collected from each cross to estimate area under the disease progress curve (AUDPC), days to 5% disease severity threshold (DT₅), and sporangia production (SP). All of these variables differed significantly among the progeny within each cross in each year. Correlation analysis indicated that DT₅ was highly correlated with AUDPC for all four populations for both years. Log-transformed SP was significantly (P>0.001) correlated to AUDPC values for one population in both years, but the significance of the correlation was variable between years for the remaining three crosses. The variable DT₅, which is composed of three components (infection efficiency, latent period, and lesion growth rate), was the most important in identifying progeny with partial resistance to late blight in all four crosses in this study.  相似文献   

Phytophthora genome sequences uncover evolutionary origins and mechanisms of pathogenesis   总被引：2，自引：0，他引：2  

Tyler BM  Tripathy S  Zhang X  Dehal P  Jiang RH  Aerts A  Arredondo FD  Baxter L  Bensasson D  Beynon JL  Chapman J  Damasceno CM  Dorrance AE  Dou D  Dickerman AW  Dubchak IL  Garbelotto M  Gijzen M  Gordon SG  Govers F  Grunwald NJ  Huang W  Ivors KL  Jones RW  Kamoun S  Krampis K  Lamour KH  Lee MK  McDonald WH  Medina M  Meijer HJ  Nordberg EK  Maclean DJ  Ospina-Giraldo MD  Morris PF  Phuntumart V  Putnam NH  Rash S  Rose JK  Sakihama Y  Salamov AA  Savidor A  Scheuring CF  Smith BM  Sobral BW  Terry A  Torto-Alalibo TA  Win J  Xu Z 《Science (New York, N.Y.)》2006,313(5791):1261-1266

Draft genome sequences have been determined for the soybean pathogen Phytophthora sojae and the sudden oak death pathogen Phytophthora ramorum. O?mycetes such as these Phytophthora species share the kingdom Stramenopila with photosynthetic algae such as diatoms, and the presence of many Phytophthora genes of probable phototroph origin supports a photosynthetic ancestry for the stramenopiles. Comparison of the two species' genomes reveals a rapid expansion and diversification of many protein families associated with plant infection such as hydrolases, ABC transporters, protein toxins, proteinase inhibitors, and, in particular, a superfamily of 700 proteins with similarity to known o?mycete avirulence genes.  相似文献   

New perspective to control of tenacibaculosis in sea bass Dicentrarchus labrax L          下载免费PDF全文

Riad H Khalil  Amany M Diab  Medhat S Shakweer  Hanan A Ghetas  Mohammed M Khallaf  Amira AE‐D Omar 《Aquaculture Research》2018,49(7):2357-2365

This work was carried out to investigate the effects of injection of Tenacibaculum maritimum formalin‐killed cells (FKC), extracellular products (ECPs) and crude lipopolysaccharide (LPS) as well as 1% feed supplements of oil extracts of Echinacea purpurea and Origanum vulgare on sea bass immunity improvement to the favour of T. maritimum experimental infection control after 4 weeks of the experiment. Tenacibaculum maritimum isolated from naturally infected sea bass showed brown to yellowish‐brown lesions (sores) on gills, skin and/or fins and identified by different biochemical methods and polymerase chain reaction technique. Immune parameters namely, total protein, globulin and lysozyme activity, as well as the relative level of protection were improved by T. maritimum (FKC), (LPS), (ECPs), O. vulgare and E. purpurea, respectively compared with control. Histopathological examination of T. maritimum naturally infected sea bass indicated many pathological changes in gill, skin and musculatures. Present study could be concluded that application of T. maritimum (FKC), (LPS), (ECPs), O. vulgare or E. purpurea improved sea bass immunity to the favour of disease resistance against T. maritimum. Further investigations on the combination between the previous control methods and the vaccine application methods will be needed.  相似文献   

Prevalence of exon 11 internal tandem duplications in the C‐KIT proto‐oncogene in Australian canine mast cell tumours          下载免费PDF全文

VS Tamlin  AE Kessell  RJ Mccoy  EC Dobson  TS Smith  M Hebart  L Brown  D Mitrovic  AE Peaston 《Australian veterinary journal》2017,95(10):386-391

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In this issue – July 2017          下载免费PDF全文

AE Jackson 《Australian veterinary journal》2017,95(7):221-222

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In this issue – August 2017          下载免费PDF全文

AE Jackson 《Australian veterinary journal》2017,95(8):263-264

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Hypocobalaminaemia as a cause of bone marrow failure and pancytopenia in a cat          下载免费PDF全文

EL Stanley  AE Eatroff 《Australian veterinary journal》2017,95(5):156-160

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