Growth Features of Castanea sativa Mill. in Forest Stands Infected by Cryphoneciria parasitica (Murrill) М. Е. Barr. in Abkhazia.

Currently, the forest plantations of Castanea sativa Mill. are largely damaged by phytopathogenic organisms, of which Cryphoneciria parasitica (Murrill) М. Е. Barr. has the most negative impact. The spread of this type of disease reduces the vital state and significantly reduces the life expectancy of C. sativa trees. For the first time, using dendrochronological analysis, the specificity of distribution and degree of phytopathogenic damage to C. sativa trunk tissues were assessed. It was revealed that in its lower part the dieback of the peripheral layers of wood occurs fairly evenly with a total degradation of cellular structures in the amount of 18-20%. In the middle segments of the trunk this figure increases almost twice. And the greatest degree of wood dieback is observed in the upper part of damaged trees. It was found that climatic changes of the last decades determine the strengthening of destructive processes in the woodland of C. sativa of the Caucasus.

[Pollen quality of Pinus pithyusa Stev. in natural stands of the South Crimea].

Results of long-term research of germination rate, vitality and dynamics of in vitro growth of P. pithyusa pollen are shown. Dynamics of pollen quality under the action of external factors has been defined.

[Study of some characteristics of morphogenesis and germination of Pinus pallasiana D. Don. pollen]. / Issledovanie nekotorykh osobennostei morfogeneza i prorastaniia pyl'tsy Pinus pallasiana D. Don.

Investigation of Pinus pallasiana D. Don. pollen morphogenesis in natural forest plantations of the southern slope of the Main ridge of Crimean mountains has been carried out. Some abnormalities of pollen grain and pollen tube formation in the course of pollen germination in vitro are described. The dynamics of developmental abnormalities of P. allasiana male gametophyte is characterized.

[Genetic control of allozymes of Pinus pityusa Stev. in natural Crimean populations]. / Geneticheskii kontrol' allozimov u sosny Pitsundskoi (Pinus pityusa Stev.) prirodnykh populiatsii Kryma.

The genetic control of 9 enzymous systems in 46 trees of Pinus pityusa Stev. of two isolated Crimean populations was studied using electrophoretic separation of izsozymes in vertical plates of polyacrylamide gel. The detailed description of electrophoretic spectra of ADH, ACP, DIA, GOT, GDH, LAP, MDH, FDH, and SOD encoded by 20 loci is presented. The comparative analysis of the results published data on these allozymous loci in closely related pine species of genus Pinus L. was made.