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E. E. Mahdy 《Plant Breeding》1988,101(3):245-249
The breeding materials used in this study were the F3, F4 and F5-generations of the cross between Giza 158 × Sonora 64 (Triticum aestivum L.). The objective of this study was to compare the relative merits of Smith-Hazel, desired gain selection indices, independent culling levels and single trait selection in improving grain yield, heading date and several agronomic traits. Highly significant differences among F3 families and a satisfactory genotypic coefficient of variability were obtained for all the traits studied. The genotypic correlations were high between yield and each of spike weight, kernels/spike and spikes; plant, intermediate with 1000 kernel weight and very low with heading date, plant height and spike1 length-After two cycles of selection, the results of the gains realized indicated that the most effective method for improving yield was the Smith-Hazel index (SH7) of seven traits followed by the desired gain index of seven traits (DG7), SH5, independent culling levels, DG5 and direct selection (or grain yield/plant. Direct selection for heading date, plant height and spike length was the best method for improving these traits, but undesirable correlated responses in the other traits were obtained. 相似文献
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Ahmed Mohamed Mahdy 《植物养料与土壤学杂志》2012,175(4):560-571
A greenhouse experiment was conducted to investigate the immediate effect of application of mono‐ammonium phosphate (MAP), single superphosphate (SSP), and triple superphosphate (TSP) fertilizers containing varying concentrations of Cd on (1) chemical speciation of Cd and Zn in soil solution by chemical‐equilibrium calculations (MINEQL+4.6 model), (2) growth of barley plants, (3) concentrations of Cd, P, and Zn in soil solution and plant tissue, as well as total plant accumulation of Cd, P, and Zn, and (4) monitoring pH and element changes during incubation periods following phosphate application. Results show that, in general, the pH of soil solution increased during the first 40 d of incubation, then declined. Also, at the end of incubation period, pH of soil solution was affected by fertilization source and fertilization rate. The concentration of Cd in soil solution changed with time. Phosphate fertilization (p < 0.05) or fertilizer source (p < 0.05) showed consistent effects. Also, the application of phosphate fertilizers with three rates significantly increased Zn concentrations in soil solution during the first half (0–30 d) of incubation period and then decreased but still more than in the control. In general, application of different sources of phosphate at 100 g kg–1 did not change the dominant forms of Cd in soil solution during all incubation time intervals. Speciation of Zn in the control after 30 d of incubation had changed, in comparison to 10 d of incubation, and the dominant forms were Zn2+, ZnOH+, ZnHCO3, ZnCO3(aq), and Zn(OH)2(aq). Adding phosphate fertilizer significantly increased both shoot and root dry weight compared to control, indicating P was a growth‐limiting factor in the control plants. The Zn concentrations in shoot and root were lower in the TSP‐ and SSP‐fertilizers treatment than those in the MAP and fertilizer treatments at all rates of fertilization. Adding phosphate increased the Cd : Zn and P : Zn ratios in the shoot and root tissue, with the effect being greater with increasing fertilization rate. Phosphate fertilization greatly increased the total accumulation of Cd of barley compared with the control plants (p < 0.001), with the effect being greater with increasing fertilization rate. Source and rate of fertilizers, and their interactions had significant effect (p < 0.05) on Cd accumulation in the whole plant. 相似文献
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Ahmed M. Mahdy Fatma K. Sherif Elsayed A. Elkhatib Nieven O. Fathi Mona H. Ahmed 《Journal of plant nutrition》2020,43(12):1862-1874
AbstractA laboratory experiment was carried out to evaluate the impact of the nanoparticles of water treatment residuals (nWTRs) and salt stress on germination and growth parameters of cucumber seedling. The interaction between three nWTRs treatments (0, 500, and 1000 mgL?1) nWTRs and five saline solution (fresh water: sea water) treatments had 0.70, 2, 3, 6, and 11?dSm?1 were studied. The results revealed that increasing salinity levels significantly reduced the percentage of germination (GP) for the primed seeds treated in fresh water and nWTRs. The GP reduction was higher in seeds primed in fresh water compared to which primed in nWTRs. Salt stress negatively affected radicle length of cucumber seedling for both priming treatments. However, this impact was more pronounced for the primed seeds treated in fresh water than which treated in nWTRs at high salinity stress. Priming in nWTRs significantly decreased the root radius of cucumber seedlings, and the1000 mgL?1 priming treatment obtained a lowest value of radicle radius. Increasing salt concentration in culture medium reduced total biomass of cucumber seedling, however for the primed seeds treated in nWTRs, the total biomass was increased in comparison with which treated in fresh water. Salt tolerance and vigor indices were significantly (p?<?0.01) affected by salinity levels, nWTRs treatments and their interaction. It can be concluded that nWTRs are ameliorating materials for plant growth under salt stress conditions. 相似文献
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Dahshan H Abd-El-Kader MA Chuma T Moriki H Okamoto K 《Veterinary research communications》2011,35(1):55-60
During 2009, Salmonella enterica subspecies enterica serovar Stanley isolates were recovered from cattle diagnostic specimens in southern Japan, and the isolates were examined
to characterize the genetic determinants involved in this new pathogenicity that associated with mortality in cattle. All
the isolates were multi-drug resistance exhibited resistance to ampicillin, chloramphenicol, streptomycin, sulfamethoxazole,
oxytetracycline, and kanamycin (ACSSuT-Km) encoded by bla
TEM, catA, aadA1, sul1, tet(A), and aphA1 genes, respectively. Class 1 integrons of 1.5-kb size were detected in all MDR isolates. The isolates harboured easily transferable
plasmids of ca. 210-kb with the potential of transmitting resistance phenotype and genotype detected in the donor isolates.
XbaI-digested PFGE patterns generated two related clusters implicated in the dissemination of multi-drug resistance amongst Salmonella Stanley isolates. An emergence of multi-drug resistant Salmonella Stanley amongst food-producing animals, including cattle is a threat to human health, as resistant isolates may be transmitted
to humans through the food chain. 相似文献
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Effects of transforming growth factor‐β1 treatment on muscle regeneration and adipogenesis in glycerol‐injured muscle 
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下载免费PDF全文 Mohamed A. A. Mahdy Katsuhiko Warita Yoshinao Z. Hosaka 《Animal Science Journal》2017,88(11):1811-1819
Transforming growth factor (TGF)‐β1 is associated with fibrosis in many organs. Recent studies demonstrated that delivery of TGF‐β1 into chemically injured muscle enhances fibrosis. In this study, we investigated the effects of exogenous TGF‐β1 on muscle regeneration and adipogenesis in glycerol‐injured muscle of normal mice. Tibialis anterior (TA) muscles were injured by glycerol injection. TGF‐β1 was either co‐injected with glycerol, as an ‘early treatment’ group, or injected at day 4 after glycerol, as a ‘late treatment’ group and the TA muscles were collected at day 7 after initial injury. Myotube density was significantly lower in the early treatment group than in the glycerol‐injured group (without TGF‐β1 treatment). Moreover, the Oil red O‐positive area was significantly smaller in the early treatment group than in the late treatment group and glycerol‐injured group. Furthermore, TGF‐β1 treatment increased endomysial fibrosis and induced immunostaining of α‐smooth muscle actin. The greater inhibitory effects of early TGF‐β1 treatment than that of late TGF‐β1 treatment during regeneration in glycerol‐injured muscle suggest a more potent effect of TGF‐β1 on the initial stage of muscle regeneration and adipogenesis. Combination of TGF‐β1 with glycerol might be an alternative to enhance muscle fibrosis for future studies. 相似文献
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Rashad A. M. A. EL-Hedainy Dalia K. Mahdy A. E. Badran A. E. El-Barbary A. S. A. 《Tropical animal health and production》2019,51(8):2405-2412
Tropical Animal Health and Production - Carcass performance of 12 fattened male buffalo calves equally grouped by slaughter weights of 300, 350, 400, and 450 kg was evaluated. Six... 相似文献
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Ahmed Mahdy Elsayed Elkhatib Fatma Sherif Nieven Fathi Maha Folaa 《Journal of plant nutrition》2020,43(18):2712-2727
Abstract Two lysimeter experiments were conducted to evaluate the impacts of biosolids and drinking water treatment residual nanoparticles (nWTRs) on phosphorus and aluminum phytoavailability and yield of corn plants. Two consecutive experiments were conducted with different application rates of biosolids (0% and 3%) and nWTRs (0%, 0.1%, 0.2%, and 0.3%). The results revealed that the total biomass production (grain plus stover) increased significantly (p?<?.05) as a result of nWTRs application at 0.1% rate. Application of nWTRs to biosolids-treated soil slightly decreased yield at 0.2% and 0.3% application rates. The best combination ratio between nWTRs and biosolids at which high corn yield is 0.1% nWTRs to 3% biosolids. Application of 3% biosolids significantly increased bioavailable P in the studied soil, but application of 0.3% nWTRs significantly decreased the bioavailable P concentrations in soil in the two seasons of cultivation. Application of nWTRs at 0.1% and 0.2% rates decreased soil pH in the soil treated with 3% biosolids in first and second seasons of cultivation in comparison with control treatment. The application of nWTRs greatly and significantly (p?<?.05) increased the water-holding capacity of studied soil treated with and without biosolids. 相似文献
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Hassan Mohamed N. Mekkawy Sara A. Mahdy Mayada Salem Khaled F. M. Tawfik Eman 《Genetic Resources and Crop Evolution》2021,68(8):3055-3079
Genetic Resources and Crop Evolution - Lettuce (Lactuca spp.) is an annual and self-pollinating crop that belongs to the Asteraceae (Compositae) family. It is one of the most globally essential... 相似文献
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The direct impact of seed-borne fungi on seed is considerable. Many fungi are serious parasites of seed primordial and maturing seeds and reduce yield of seed both quantitatively and qualitatively. Other fungi, including saprophytes and very weak parasites, may lower the quality of seeds by causing discoloration which may seriously depreciate the commercial value of seeds, particularly of grain when graded for consumption. Studies by using scanning electron microscopy （SEM） confirmed the importance of the seed coat, and seed cells as infection sites as well as location of the mycelium of the investigated fungus. Macrophominaphaseolina The present investigation is undertaken to study the colonization, infection and fungal establishment on different sesame seed parts by （SEM）. A successful colonization of M. phaseolina to seed tissues was also detected. Different forms of pycnidial shapes were also observed. 相似文献