[Adaptation of the Seed Reproduction System to Conditions of Maritime Antarctic in Deschampsia antarctica E. Desv.].

Deschampsia antarctica E. Desv. is one of the two flowering plants that, along with Colobanthus quitensis (Kunth) Bartl.

[In planta transformation of maize through inoculation of Agrobacterium into the silks].

Integration of T-DNA into the maize genome as a result of treatment of silks with Agrobacterium cells, containing activated vir genes, was demonstrated. In planta treatment of maize (Zea mays L) was performed during flowering in field. Cell suspension of Agrobacterium tumefaiciens strain GV3101(pTd33), carrying activated vir genes, was applied onto the previously isolated silks, which were afterwards pollinated with the pollen of the same cultivar.

[Genetic control of cytoplasmic male sterility in plants: state of the problem and current approaches].

The organization and functions of genetic systems controlling cytoplasmic male sterility (CMS) in plants are reviewed. Mitochondrial genes that code for specific proteins disturbing the functions of mitochondria have been found by comparisons between CMS lines and fertile F1 hybrids and between forms originating from in vitro cultures (fertile revertants, cybrids). Nuclear fertility-restorer genes abrogate expression of these mitochondrial genes at the transcriptional or posttranslational level and thereby prevent synthesis of their protein products.

[Protein synthesis in maize haploids and diploids during cultivation under normal conditions and in the presence of phenol].

14C-leucine incorporation in cytoplasmic protein was compared for three haploid forms, three derivative autodiploid lines and four hybrid forms of maize. It has been found that the precursor incorporation in the haploid forms was by 15-20% higher that in appropriate autodiploid lines. However, the level of protein synthesis wes practically the same for all investigated diploid forms.