Intragenomic polymorphism of ITS2 of nuclear ribosomal DNA sequences was analysed in 30 samples belonging to Nitraria schoberi, N. sibirica. The nucleotide variability of the ITS2 region was detected in the studied Nitraria species as single-nucleotide substitutions (mainly transitions) and single-nucleotide deletion. Five ribotypes of Nitraria were identified in Russia, Kazakhstan and Tajikistan. These ribotypes formed two haplogroups that belong to the species N. schoberi and N. sibirica, respectively. The high importance of the discriminatory role of the ITS2 spacer in identifying species of the genus Nitraria is confirmed.

No abstract

The article determines the species composition of causative agents of plant leaf diseases of the genus Alnus Mill. for the Siberian region, that grow in the arboretum collections and urbanized environment. The author has identified four phytopathogens, their spread and harmfulness are specified; established the confinement of foliar fungal pathogens to the host plant species, its ontogeny phase, and abiotic environmental factors. It had been found a hyperparasite Ramularia uredinis (W. Voss) Sacc. on a causative agent of alder rust (Melampsoridium alni (Thum.) Dietel), for which this phytopathogen is a new host.

No abstract