Биология

The article is addressed to changes in the activity of essential enzymes of nitrogen metabolism in the offspring exposed to toxic influence in the neonatal period. Possible mechanisms of these changes are discussed.

The ability of strain Dietzia maris AM3, isolated from oil-silme, for active utilization of petroleum hydrocarbons was shown. Plasmids (size, near 54 kb) were found in this strain, capable of degrading petroleum hydrocarbons by 50–70% both in acid and in neutral media.

Description of a modern state of flora and vegetation of the Volgograd reservoir in administrative boundaries of the Saratov region was suggested in the article. Modern composition of reservoir flora was revealed. Overgrowing features of different parts of the reservoir were investigated.

 Microbial ecological systems of Dolycoris baccarum L. and Carpocoris fuscispinus Boh. digestive tract in territory of the Saratov region was studied. 20 bacteria species belonging to 13 genera was revealed. Erwinia rhapontici causing diseases at plants was among them.

From a position of S.S. Khokhlov’s conception (1946) in the light of the modern data on embryology and genetics of apomixis the perspectives of plant evolution is discussed. On the example of Poaceae it is demonstrated, that apomixis is the mechanism, which helps the modern plants to achieve the reproductive success. 

On group of genotipes T.aestivum and T.durum studied features of development of shoot apex and primordium leaves of embryo shoot of a germ seed wheat. On genotipes T.aestivum investigated laws of growth and development of shoot apex, leaves, influence defoliation on morphogenes of the main shoot, realization of elements of production at change the source-sink of the relationships. 

Possible pathways of the agamic complex evolution in flowering plants are under consideration. Arguments are addused that gametophytic apomixis as the mode of reproduction in flowering plants existed in all the times of their evolution and that agamic complex transformated in sexual polyploid complexes.

On the basis of the results from analyses of lipopolysaccharides of eight Azospirillum strains, we showed that the major fatty-acid contents in these lipopolysaccharides were those of 3-hydroxytetradecanoic, hexadecanoic 3-hydroxyhexadecanoic, and octadecenoic acids. This finding confirms that these microorganisms are correctly assigned to the α-subclass of Proteobacreria. An exception was the fatty-acid profile of the lipopolysaccharide from A.