Биология

The article presents the results of cytoembryological analysis of four cenopopulations of two Anthoxanthum L. species from the fl ora of the Saratov region: A. nitens (Weber) Y.Schouten & Veldkamp and A. repens (Host) Veldkamp. Embryological characters of Hieracium-type apospory and pseudogamy were recorded in plants of both species: (1) formation of several eight-nucleate seven-celled embryo sacs in the ovule; (2) development of the proembryo in unfertilized megagametophytes with intact polar nuclei.

The article presents the results of testing and optimization of the sample preparation technique for fl ow cytometric analysis of two species that have not been previously studied in this aspect: Colchicum bulbocodium subsp. versicolor and C. laetum. We are using optimal LB01 buff er with added sodium thiosulfate, as internal standards we take Petroselinum crispum and Secale cereale. For the fi rst time, the DNA content in living samples of C. bulbocodium subsp. versicolor (2C = 8.049 pg) and C.

The article presents the results of a comparative analysis of the distribution of plant species belonging to the families Typhaceae, Potamogetonaceae, Ruppiaceae, Juncaginaceae, Alismataceae, Butomaceae, Hydrocharitaceae in the Lower Volga region based on the materials of the herbarium of the Saratov State University named after N. G. Chernyshevsky (SARAT).

Halophilic microorganisms attract the attention of researchers due to their ability, acquired during adaptation to existence in extreme conditions, to synthesize biopolymers with unique properties that are potentially in demand in biotechnology. Bacteria inhabiting the rhizosphere of plants growing in soils with an increased level of mineralization often demonstrate growth-stimulating activity.

List of herbarium papers of black-fruited sedge Carex melanostachya Bieb. ex Willd. stored in Herbarium of Saratov State University had been made in number of 132 specimens from Russia (Astrachan, Volgograd, Orenburg, Saratov regions and Kalmuck), also Kazakhstan with the framework of preparation for project 'Flora of Rossia'.

Description of seven main associations of oak forests in Chvalynsk national park of Saratov region had been made depending on soil and position on the relief. The state of viability had been estimated. Species composition of herbaceous and shrubs strata had been discovered.

We studied the nitric oxide availability in blood in healthy and hypertensive female rats under deficient of estrogens under rest and stress conditions. We found that the basal and stress NO levels were lower in hypertensive vs. healthy female rats.

In article are considered changes of some physical and chemical parameters of blood white female rats on at toxic influence by ions of cadmium and during the various periods of adaptation.