Genetics and plant evolution

The distribution of gametophytic apomixis among the Asteraceae spesies from European part of Russia

In a course of investigation of seed productivity under the pollenless regime of flowering and cytogenetic investigation in 250 natural populations of 167 species of 62 the Asteraceae genera from European part of Russia gametophytic apomixis has been discovered in populations of 37 species from 20 genera. For the first time this mode of reproduction has been revealed in 26 species from 10  genera.

Database «Apomicts»

The article describes the possibility of accumulation of empirical data storage and database management «Аpomicts» as an example to study the ability of apomictic reproduction in representatives of the family  Asteraceae.

Research of gametophyte apomixic frequency of Fabaceae family species of Saratov region

During the cytoembriological investigation of the species of Fabaceae family, growing in the different areas of Saratov region the ability of gametophyte apomixic was found out of 4 species of Fabaceae. This way of reproduction of Fabaceae family was noticed for the first time.

Comparative analis of karyotypes of the South-ural Oxytropis DS. species

A karyological study of a chromosome sets structures of seven of the seventeen species of the Oxytropis DC. from natural populations of the South Ural was conducted. There were revealed both interspecific and intraspecific similarities and differences on the chromosome sets structures and the feature of their morphology between the examined species. These results are of interest for further discussion of issues related to taxonomy and evolution of the genus Oxytropis DC.

Apomictic species in genus Hierochloё R. Br.

The article is dedicated to cytoembryology investigation of two cereals species: HierochO glabra (two populations from Kamchatka) and H. repens (one population from Lower Volga region). The plants of these populations are characterized by high frequency of ovules with few (2-4) megagametophytes (5,7; 8,6 и 25%, respectively). This point to the apoarhespory - development of unreduced embryo sacs from somatic nucellus cells.

Apomictic reprodaction way of willows (Salix L.)

During the cytoembriological investigation and the research of seed productivity of the species of Salix L. (Salicaceae), growing in the different areas of Saratov region the ability of gametophyte apomixic was found out in 12 populations of 8 species of willows. This way of seeded reproduction of willows was noticed for the first time.

The research of the apomictic reproduction ability Trollius europaeus L., Adonis wolgensis Stev ex Dc and Anemonoides ranunculoides Holub. (Ranunculaceae)

During cytoembryological investigation of Toillius europaeus L., Adonis wolgensis Stev. and Anemoides ranunculoides (Ranunculaceae) the features of game- tophyte apomixis was found for the first time. The proporcion of ovules with the features of gametophyte apomixis was maked 16,32±6.12 in Trollius europaeus population, 5.82 ±1.82 in Adonis wolgensis population, 3.22 ±1.13% in Anemoides ranunculoides population.

Aposporiy in representatives of the genus Koeleria Pers.

The article presents the results of cytoembryological analysis of two cereal species: Koeleria cristata (L.) Pers. и K. sabuletorum (Domin) Klok. It was found that in the plants of both species many ovules (23 and 30%, respectively) contain from 2 to 5 megagametophytes. In the ovules the multiple embryo sacs were on the same or different development stage. In the nuccelus of some ovules near the embryo sac the big cells could also be observed. The morphology of these cells liked to initial cells of aposporous embryo sacs.

Parthenocarpy and apomixis of willow species

During the research of seed productivity of 6 willow species growing in Saratov region the ability to the parthenocarpic fruit formation was found out for the first time. Correlation was not found out between the ability of Salix plants to parthenocarpy and the ability of reproduction with the help of gametophyte apomixis.

Preparation regenerants Potentilla volgarica Juz. (Rosaceae) for landing from in vitro culture under natural conditions

Plantlets of P. volgarica were obtained in culture in vitro. It is established that rooting was induced on a half-diluted hormone-free medium or supplemented IAA 0.05 mg/L. In vitro rooted plantlets of P. volgarica acclimatized ex vitro  in peat substrate mixed with chalk, vermiculite and a drainage layer of expanded clay. After acclimatization plants were successfully transplanted to natural conditions.