Биология

Megaspore- and megagametophytogenesis in tobacco mutant with reduced cells number in embryo sacs were studied. It is established, that the mutation causes a disturbance of one pair of homologous chromosomes conjugation in meiosis. Consequently alongside with the haploid (24-chromosomal) spores aneuploid (23-chromosomal) spores forms which are developed into abnormal embryo sacs. At cenocyte stage of megagametophytes development falling out of 1-2 mitoses and/or their abnormal course were observed, as well as abnormalities in embryo sacs polarization.

The data base of condition rare plants species in Saratov province has been composed for the first time for region. The structure of base and patterns of presenting data in various levels are considered. Keywords: DATA BASE, RARE SPECIES OF PLANTS, MONITORING, SARATOV PROVINCE

As a result of the revision of herbarium samples of Thymus (Lamiaceae) collected in the central part of the Russian Caucasus (Kabardino-Balkarian Republic, Karachay-Cherkess Republic, Republic of North Ossetia-Alania, Stavropol Territory) and transferred to the Herbarium of the Institute of Ecology of the Volga river basin of the Russian Academy of Sciences (PVB), 17 species of the genus Thymus were identifi ed: T. buschianus Klokov et Des.-Shost., T. caucasicus Willd. ex Ronniger, T. daghestanicus Klokov et Des.-Shost., T. elisabethae Klokov et Des.-Shost., T.

We optimizes the composition and concentration of the enzymes, the time for enzymatic treatment and the volume of the enzyme mixture. We also optimized the concentration osmotic of agent, the centrifugation mode, and fi lter pore size for protoplasts isolating from epidermal cells of maize roots (Zea mays L.) of the Brown Marker (BM) line. It was found that 150 minutes is the optimal time for 150 mg root tissue maceration.

The paper presents the results of the study of the biological features of Orthosiphon aristatus (Blume) Miq. (awned orthosiphon) in open ground conditions on the Southern Coast of the Crimea and in a greenhouse. Features of fl owering, structure of male and female generative structures are revealed.

. Recently, much attention has been paid to the development of technologies for biodegradation of organopollutants and the search for promising biodestructors. The environmental accumulation of lignin-like compounds and synthetic dyes poses a huge threat not only to ecosystems and biodiversity, but also to human health. Phenol oxidases are enzymes with broad substrate specifi city, with oxidizing ability towards various polyphenols and aromatic amines. Therefore the use of phenol oxydases as bioremediation agents is promising due to their unique catalytic properties.

The article for the fi rst time presents the comparative results of the content of ash substances, sulfur, phenolic compounds (tannins), ascorbic acid in the leaves of plants Iris hybrida, Hosta decorata, H. albomarginata, H. lancifolia, cultivated in the Central Siberian Botanical Garden (CSBS, Akademgorodok) and used in landscaping the urban environment of the Berdsk and Koltsovo settlements (Novosibirsk region) during the seasonal development in 2020.

From the stand point of the possible use of microorganisms in water purifi cation biotechnologies, studying microorganisms capable of removing dangerous pollutants such as heavy metals from the aquatic environment is of great importance. Microbial screening was conducted on isolates from microbiocenoses of highly magnetic soils of the city Mednogorsk (Orenburg region, Russia), to assess their resistance to manganese (II) ions.

Crambid moth Neocrambus wolfschlaegeri (Schawerda, 1937) is reported from the Volga-Ural Region (Orenburg and Saratov Provinces). This represents the fi rst record of this species from Russia. The external morphology and genitalia are illustrated and some details of the morphology are discussed.