Biology

Acoustic Communication Signals between Ants of the Genus Formica (Hymenoptera: Formicidae) and Myrmecophilous Beetles of the Genus Scydmaenus (Coleoptera: Staphylinidae)

In the article was given the mathematical approaches to classification and clustering of data of acoustic signals in communication between myrmecophilic beetles (Scydmaenus hellwigii) and ants (Formica rufa). For the first time for these species were used a cluster analysis which revealed four clusters, each of them has its own command from the beetle to the ant. Each command was defined by specific ranges of dominant frequencies and a range of medium amplitudes (the values of the parameters R).

The Female Gametophyte Structure Features of Two Nicotiana Tabacum L. Mutant Lines

The embryo sacs structure in the two mutant lines of Nicotiana tabacum L. was investigated. The various disturbances in the megagametopyte structure were detected. In the М-3 line the gametophyte mutation suppresses the nucleus mitotic activity and cell walls initiation in embryo sacs. These disturbances lead to the formation of low-nuclear coenocytic or cellular gametophytes. In М-2 line the cellular gametophytes with increased number of cells and nucleus was dominated. The reason of this phenomenon is an increase of mitosis number during a gametophytogenesis.

Antagonistic Activity of Bacterial Association of Apple Shoots Against Phytopathogenic Fungi

Microbial associations on surfaces and internal environment on shoots of apple sorts Golden Delicious, Wealthy and Berkutovka with symptoms of fungal infections were studied. 195 strains of epiphytic and endophytic bacteria, of which 8 strains had marked antagonistic activity against phytopathogenic fungi Alternaria alternaria, Aspergillus tubiengensis, Fusarium incarnatum equiseti, Fusarium tricinctum and Phoma fungicola were isolated. Antagonistic bacterial strains are identified as Bacillus amyloliquefaciens SA77, B. badius SA68, B. gibsonii SA104, B. methyloprophicus SA94, B.

Effect of Exopolysaccharides of the Bacterium Paenibacillus Polymyxa 1465 on Growth and Defense Responses of Wheat

Rhizobacteria of the genus Paenibacillus promote plant growth and induced systemic resistance to diverse environmental stresses. Here we present the results for the effect of exopolysaccharides (EPS) obtained from growth of Paenibacillus polymyxa 1465 with different carbon sources on the early stages in the development of wheat (Triticum aestivum L. cv. Saratovskaya 29) and on the peroxidase activity in wheat seedling tissue.

Light Influence on Morphogenesis Wheat

In work results of research morphogenesis wheat are presented at presence or absence of the light factor. Influence of light on growth of all leaf shoot, activity of a cone of increase and growth of germinal root system of a seedling of wheat is established. In the presence of the light factor growth epicotyl begins with the moment of the termination of growth coleoptile. Growth epicotyl occurs synchronously to growth of a sheath of 1st leaf. In the absence of light growth coleoptile and epicotyl proceeds and after end of growth of a plate and a sheath of 1st leaf.

Morphologigal Characteristics of Seeds of Some Iris L. Species in Saratov Region

The research presents the results of morphological study of seeds belong to five species of Iris L.: I. aphylla L., I. halophila Pall., I. pseudacorus L. I. pumila L., I. sibirica L. which existed in Saratov region and cultivated in the botanical gardens of national research of Saratov state university, previously named «N. G. Chernyshevsky».

The Rare and Endangered Species of Mammals Recommended for Entering into the Third Edition of the Red Book of the Saratov Region

The list of species of the mammals recommended for entering into the third edition of the Red List of the Saratov region is provided. The necessity to correct and extend the protected taxon list in comparison with the second edition is substantiated.

Rare and Disappearing Birds in the Red Book of Saratov Region

A list of bird species recommended for inclusion in the third edition of the Red Book of the Saratov region. Three groups stand out among the rare and protected bird species are introduced for the first time – 10; excluded –14; with the change in status – 22.

Rare and Disappearing Species of Amphibians and Reptiles to Be Included into the Third Edition of Red Book of the Saratov Region

Rare and disappearing species reptiles to be included into the third edition of Red Book of the Saratov region has been compiled on the basis of modern field surveys, collection data, analysis of literature. It contains 7 herpetofauna representatives of region belonging to 3 orders and 5 families.

Rare and Disappearing Species Сephalaspidomorphi and Fish to Be Included Into the Third Edition of Red Book of the Saratov Region

Rare and disappearing species Cephalaspidomorphi and fich to be included into the third edition of Red Book of the Saratov region has been compiled on the basis of modern field surveys, collection data, analysis of literature. It contains 2 species cephalaspidomorphi and 16 species fich.

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