Colocation of downy mildew (Plasmopara halstedii) resistance genes in sunflower (Helianthus annuus L.)     

Patricia Roeckel-Drevet  Geneviève Gagne  Said Mouzeyar  Laurent Gentzbittel  Jacqueline Philippon  Paul Nicolas  Denis Tourvieille De Labrouhe  Felicity Vear 《Euphytica》1996,91(2):225-228

Summary The Pl6 locus in the inbred sunflower (Helianthus annuus L.) line HA335 giving resistance to French races of downy mildew (Plasmopara halstedii (Farl.) Berl. & de Toni. was localized by molecular techniques. A bulked segregant analysis was made on the F2 progeny from a cross between this line and H52, a downy mildew susceptible line. The resistance gene in HA335 was found to have the same linked RFLP marker loci as those determined for Pl1 (resistance to race 1 in the line RHA266) on linkage group 1 of the consensus RFLP map of the cultivated sunflower. Pl1 and Pl6 thus appear either to be allelic or closely linked. The implications for sunflower breeding are discussed.  相似文献   

Variation of Agro-morphological Characters in Moroccan Barley Landraces Under Near Optimal and Drought Conditions     

Said?El?MadidiEmail author  Zineb?Diani  Fouzia?Bani?Aameur 《Genetic Resources and Crop Evolution》2005,52(7):831-838

In many areas of North Africa, barley is often the only possible rainfed crop. In these regions water deficit is the primary constraint affecting crop production. Twenty barley landraces collected from different localities in south Morocco and four modern varieties were characterized in two field experiments, one under well-irrigated and one under limited-irrigated conditions. Nine agro-morphological characters were evaluated: Plant height, tiller number per plant, number of grains per spike, number of spikes per plant, spike weight, spike length, plant weight (PW), number of internodes of rachis (NIR), and length of the last internode of rachis. The correlation coefficients among characters were nearly the same in the well- and limited-irrigated experiment. Under limited-irrigated conditions, plant growth was significantly decreased as measured by all characters except NIR, which was unaffected. The percentage of reduction, ranging from 80.08% to 5.82%, was recorded on PW and NIR, respectively. The injury index ranging from 4.02 to 0.06 was recorded on PW and NIR, respectively. Using discriminant analysis the genotypes were arranged in three, clearly separated groups that varied in their tolerance to drought stress.  相似文献   

Effect of copper smelting air pollution on the mites (Acari) associated with young Scots pine forests polluted by a copper smelting works at Giogów,Poland. I. Arboreal mites     

SENICZAK  STANISŁAW  DĄBROWSKI  JANUSZ  DŁUGOSZ  JACEK 《Water, air, and soil pollution》1997,94(1-2):71-84

Water, Air, &; Soil Pollution - The arboreal mites and epiphytes in young Scots pine forests (plant association Leucobryo-Pinetum) polluted by a copper smelting works at G?ogów, were...  相似文献   

Response of Sunflower to Sulfur Rate and Time of Application under Two Tillage Systems in a Silty Clay Soil of Dera Ismail Khan Pakistan     

Khalid Usman  Samee Ud Din  Inam ullah  Said Ghulam  Muhammad Waqas Imam Malik  Muhammad Saad 《Communications in Soil Science and Plant Analysis》2020,51(11):1423-1433

ABSTRACT

Sulfur (S) availability is a characteristic of conservation tillage. We studied the effects of S on sunflower yield and fatty acid profile under conventional and conservation tillage in silty clay soil of D.I. Khan, Pakistan. Conventional tillage consisted of disk plowing followed by tiller and rotavator, while conservation tillage comprises tiller and disc harrowing. Treatments comprise six sulfur levels (S₁ = 0, S₂ = 20 kg S ha^?1 at sowing, S₃ = 10 kg S ha^?1 at sowing +10 kg S ha^?1 25 days after sowing (DAS), S₄ = 40 kg S ha^?1 at sowing, S₅ = 20 kg S ha^?1 at sowing + 20 kg S ha^?1 25 DAS, and S₆ = 20 kg S ha^?1 at sowing + 10 kg S ha^?1 25 DAS + 10 kg S ha^?1 50 DAS) replicated thrice. After 2 years of experimentation, soil samples were collected (from 0 to 0.30 m depth) for organic matter (OM), total soil N (TSN), and available sulfur analysis. Conservation tillage significantly increased OM, TSN, and S contents in 0–0.30 m soil compared to conventional tillage. Likewise, sunflower plants showed higher achene yield, better fatty acid profile, and net economic returns in conservation tillage than in conventional tillage. Application of 20 kg S ha^?1 at sowing and 10 kg S ha^?1 at each 25 and 50 DAS recorded significantly higher achene yield, higher oil, and linoleic acid contents; however, oleic and oleic/linoleic ratio did not increase with higher S rates. Conservation tillage was effective in increasing OM, TSN, and available S besides increasing yield and economics in silty clay soil.  相似文献   

Effect of body condition score on the testicular biometrical measures,semen characteristics and testosterone level in jackass     

Shimaa R. Masoud  Afaf A. Kishta  Omaima M. Kandil  Said I. Fathalla  Sherif M. Shawky  Ahmed Sabry S. Abdoon 《Reproduction in domestic animals》2021,56(12):1506-1510

This study was undertaken to evaluate the effect of body condition score (BCS) on testicle and epididymis biometrics, semen characteristics and testosterone level in Egyptian Jack. This study was conducted on 50 mature Jacks divided according to their body condition score into four groups: Poor (G1), moderate (G2), good (G3) and fat (G4). The complete testis was collected immediately after execution in the Giza Zoo abattoir; then, the epididymis was carefully dissected at the testicular junction. Biometrical measures including length, weight and volume were determined for the right and left testis and epididymis. Also, epididymal sperm was collected from all examined animas and evaluated for sperm concentration, progressive motility, viability and sperm abnormalities. Serum samples were collected for determination of total testosterone level. Results showed that the body condition score of the examined animal affects their biometrical measure of testicles and epididymis. There is a significant decrease (p < .05) in biometrical measures for the testicles and epididymis, sperm concentration, motility, viability and testosterone level in poor BCS animals (G1). The highest values were recorded in Good BCS (G3) Jacks. Conclusion: Jacks with good BCS (G3) should be selected for breeding activity in donkey.  相似文献   

Effect of the intravenous infusion of butyrate, isobutyrate and isovalerate on the blood serum levels of glucose, insulin, free fatty acids and total alpha-amino-N in sheep under conditions of adequate feeding and after an 8-day fast     

I Müller  E Kolb  A Said  C Gottschild  G Gründel  C Schineff  U Schmidt  G Vallentin 《Archiv fuer experimentelle veterinaermedizin》1985,39(1):10-24

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Modification of the level of glucose, insulin, free fatty acids and total alpha-amino-nitrogen in the blood plasma of sheep by intravenous infusion of glucose and fructose solution during full feeding and following a hunger period     

I Müller  E Kolb  E Taye  A Said  C Gottschild  C Schineff  U Schmidt  G Vallentin 《Archiv fuer experimentelle veterinaermedizin》1985,39(2):268-281

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Metabolism of alveolar cells: histochemical evidence and relation to pulmonary surfactant     

Said SI  Klein RM  Norrell LW  Maddox YT 《Science (New York, N.Y.)》1966,152(3722):657-659

Large alveolar cells of normal dog lung are rich in enzymes concerned with oxidative and synthetic pathways. In three experimental situations where ability of the lung to produce surfactant was impaired, the enzyme-rich cells were lacking or absent. Findings support the concept that these cells are sites of active metabolism, possibly including production of surfactant.  相似文献   

Compressibility, Phase Transitions, and Oxygen Migration in Zirconium Tungstate, ZrW2O8   总被引：1，自引：0，他引：1  

JSO Evans  Z Hu  JD Jorgensen  DN Argyriou  S Short  AW Sleight 《Science (New York, N.Y.)》1997,275(5296):61-65

In situ neutron diffraction experiments show that at pressures above 2 kilobars, cubic zirconium tungstate (ZrW2O8) undergoes a quenchable phase transition to an orthorhombic phase, the structure of which has been solved from powder diffraction data. This phase transition can be reversed by heating at 393 kelvin and 1 atmosphere and involves the migration of oxygen atoms in the lattice. The high-pressure phase shows negative thermal expansion from 20 to 300 kelvin. The relative thermal expansion and compressibilities of the cubic and orthorhombic forms can be explained in terms of the "cross-bracing" between polyhedra that occurs as a result of the phase transition.  相似文献   

The Health Burden of Orphan Zoonotic Disease in the United Kingdom, 2005–2009     

K. D. Halsby  A. L. Walsh  R. Smith  B. Said  H. Kirkbride  B. Smyth  L. Browning  L. Larkin  D. Morgan 《Zoonoses and public health》2014,61(1):39-47

‘Orphan’ zoonotic diseases attract disproportionately low scientific and public health attention for the impact that they can have. This article pulls together information on their health burden in the UK from routine and enhanced data sources. These diseases are heterogeneous in nature; some have very low case numbers (e.g. hydatid disease), whilst others affect hundreds of patients each year (e.g. toxoplasmosis). The number of deaths attributed to orphan zoonoses is relatively low, and the majority recorded in this article were caused by toxoplasmosis. There is a clear issue of under‐reporting and under‐diagnosis in the data sets presented, and further work should be carried out to obtain more accurate estimates of the prevalence of zoonotic infections. Joint human and veterinary studies are especially important for these diseases.  相似文献