Crop wild relatives as part of the adventive component in the flora of Amur Province, Jewish Autonomous Province, Primorsky Territory, and Khabarovsk Territory

Background. The аdventive component in the flora of the Russian Far East changes over time and has its own specific features connected with the region’s natural environments and priority trends of agricultural production. Crop wild relatives (CWR) with the ability to adapt to a new environment are of interest as sources of utilizable plant germplasm and genetic diversity. Amur Province, Jewish Autonomous Province, Primorsky Territory, and Khabarovsk Territory, situated in the southern part of the Russian Far East, were chosen for a comparative study of the composition of adventive CWR plants.

Materials and methods. Information on alien species was taken from publications, herbarium materials, collecting missions, and personal observations. A dendrogram of floristic similarity (Jaccard index) was built using the PAST.1.71 software package.

Results. As a result, an annotated list was compiled. It included 189 plant species, belonging to 87 genera and 22 families: 139 CWR species occurred in Amur Province, 82 in the Jewish Autonomous Province, 143 in Khabarovsk Territory, and 173 in Primorsky Territory. The taxonomic composition and the degree of naturalization were analyzed for the listed species, among which the most threatening and actively spreading ones were identified. A common core of 70 omnipresent adventive CWR was ascertained. A cluster analysis of the species composition in the studied areas showed that the highest level of similarity was in Khabarovsk and Primorsky Territories, while the lowest level of similarity characterized the Jewish Autonomy. The rates of naturalization for alien CWR species were variable across the surveyed areas. The share of species vigorously invading secondary and natural landscapes was higher in the Jewish Autonomy, with the highest absolute figures observed in Primorsky Territory. Active invasive or potentially dangerous species accounted for about 18% of the total number of CWR species in the studied region.

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