PHYSIOLOGICAL REACTION OF REGIONAL VARIETIES COMMON WHEAT UNDER CONDITIONS OF ECOLOGICAL STRESS

Siika PAVLOVA, Vesselin DOCHEV

Abstract. During the period 2005–2007 at the experimental fields of IASS “Obraztsov chiflik” a provocative fiеld experiment was conducted with simulated drought of 20 varieties winter common wheat. The varieties were cultivated under conditions of moisture providing (control) and simulated drought during the most critical phase of ontogenetic development–flowering–formation of reproductive organs via shelter construction. Resistance to soil and atmospheric drought was investigated also and the vigor of seeds via electrical conductivity of seed membranes–conductormetric. The results of the investigation showed specific features, as depending on the simulated drought, so – on the meteorological variations during ontogenesis. The stress soil and atmospheric moisture during the spring vegetation decreased the resistance to heat of the varieties Todora, Enola and Ludogorie. Under conditions of soil and atmospheric drought the same varieties showed high resistance to heat, also and the varieties Prelom, Kristi, Pobeda, Pryaspa, Preslav. The vigor of seeds decreased as under conditions of stress water providing, so under conditions of soil and atmospheric drought. Increasing the strength of the stressor–soil and atmospheric drought, the vigor of seeds suddenly decreased.

Keywords: wheat, drought resistance, resistance to heat

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APPLICATION OF MOLECULAR DYNAMICS SIMULATIONS METHOD FOR PEPTIDE 1ED3

Marian BUŢU, Alina BUŢU

Abstract. Molecular dynamics simulations method gives the possibility of studying and understanding the relationships between the structure and the function of biological molecules. Once with increasing the computing power, this method became a very powerful tool to predict the quantities that cannot be measured directly or whose accurate experimental data are difficult to obtain. It can provide a microscopic image of system which may explain macroscopic behavior of the biomolecular system. Molecular dynamics simulation method can be applied to: sampling configuration space, description of the system at equilibrium, calculating dynamics and kinetics of system. The peptide MTF–E is a fragment of 13 residues (residues 29–41) from rat ATPase 6. This peptide is recognized by Major Histocompatibility Complex class I (MHC I). Here we examine the conformational properties of the peptide using molecular dynamics simulation method. Trajectory analysis indicated that the peptide adopts a certain conformation of the backbone.

Keywords: molecular dynamics, simulation, biological molecules, peptide, computational methods.

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GROWTH, DEVELOPMENT AND YELD OF MAIZE HYBRIDS IN VARIOUS CONFIGURATIONS AND DENSITIES OF SOWING UNDER EXTREME CLIMATIC CONDITIONS OF OBRAZTSOV CHIFLIK–ROUSSE I. ACCUMULATION OF BIOMASS

 Lubomir IVANOV, Siika PAVLOVA, Ivelina VENKOVA

Abstract. During the period 2007– 2009 a field experiment was conducted at the IASS “Obraztsov chiflik”– Rousse for determination of the accumulation of dry matter in three maize hybrids according to FAO: Clarica–300; Evelina–400 and PR35P12–500. The experiment was conducted in densities 4000, 5000, 6000 and 7000 plants per a da in two configurations of sowing–square and rectangular. The results showed that the tested hybrids accumulated various quantity biomasses depending on the climatic conditions, density and the configuration of the nutritive area. Under conditions of extreme soil and atmospheric drought, hybrid PR35P12 accumulated the highest quality of biomass in square configurations 50/50 cm and 44.7/44.7 cm and in the rectangular–70/35.7 cm and 70/28.6 cm, and hybrid Clarica–in the densities of 50/50 cm and 70/35.7 cm. Only hybrid Evelina accumulated more dry matter in the rectangular configurations of 70/35.7 cm and 70/28.6 cm.

Keywords: dry matter, density, square and rectangular configurations

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APPLICATION OF MODERN HERBICIDES FOR WEED CONTROL IN SPRING RAPE (Brassica napus)

Svetlana P. STOYANOVA

Abstract. A field trial with spring rape, JURA variety was conducted during the period 2007–2008 at the experimental fields of IASS “Obraztsov chiflik”–Rousse. The objective was determination of the efficiency of some herbicides applied alone and in combination in optimal doses. The herbicide napropamide, applied after sowing before emergence in dose of 157.5g/da a.s., decreased grass weed density 100% and the density of broad–leaved weeds by 89% and 84%, respectively. The herbicides fluazifop–p–butil and quisalofop–p–ethyl applied in doses of 22.5g/da a.s. and 7.5g/da a.s., were effective against the grass weeds as their density was decreased up to 98%, and against the broad-leaved weeds the percentage of efficiency was up to 83%. The herbicide napropamide applied in a system with herbicides fluazifop–p–butil or quisalofop-p-ethyl showed excellent herbicidal efficiency against the annual grass weeds (to 100%) and broad–leaved weeds (to 93%).

Keywords: spring rape, weeds, herbicides, efficiency, selectivity

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PRODUCTION OF MAYONNAISE FROM DATE PITS OIL

Amany M. M. BASUNY, Maliha A. ALMARZOOQ

Abstract. Chemical composition of the residual pits from processing of date (Phoenix dactylifera L.) variety khalas from AL–Hasa region–Saudi Arabia was investigated. The extracted oil from residual pits were analyzed for their physico–chemical proprieties, (refractive index, colour, acid value, peroxide value, iodine number, saponificaion number and unsaponifiable matter), total phenols tocopherol content, fatty acids composition, Hydrocarbons and sterols compounds by gas liquid chromatography, oxidative stability by Rancimat method at 100°C±2°C. Minerals content of date pits were analyzed by atomic absorption spectrophotometer. Date pits oil was used to replace oil in producing mayonnaise and sensory qualities were evaluated as compared with commercial mayonnaise was prepared from corn oil. The data demonstrate that mayonnaise containing date pits oil was superior in sensory characteristics as compared with control manufactured from corn oil. Results showed that the date pits oil could be used as nontraditional oil in some food processing such as mayonnaise products.

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