Among the mountain systems that make up the Zarafshan range within Uzbekistan, the largest is the Karatepa mountain range with an absolute height of 2200 m. It can conditionally be divided into four vertical altitude zones. The highest zone occupies a height of 1800-2200 m; the middle zone is 1200-1800 m and the lower zone is 750-1200 m. Below this height is the foothills. The aim of the research is to study the species composition and abundance of phytonematodes associated with perennial wild plants of the Zarafshan mountains. The objects of study were phytonematodes living in the roots, aboveground organs, and the root soil of plants. The subject of the study is to elucidate the regular changes in the species diversity and the numerical composition of phytonematodes in mountain biocenoses depending on changes in the vertical-altitude zones of mountain ranges. In the collected samples, 121 species were found belonging to two classes (Adenophorea, Secernentea), four subclasses (Enoplia, Chromadoria, Rhabditia, Diplogastria) and eight orders of nematodes. Among the orders, Tylenchida, represented with 59 species, dominates. For convenience of analysis, the detected phytonematodes were classified according to A. A. Paramonov  into pararisobionts, eusaprobionts, devisaprobionts, non-specific phytohelminths or mycophages and true parasites. Pararisobionts are found in the root soil of plants and feed on soil detritus, bacteria and other organisms, in particular nematodes. Depending on the type of food, they are divided into detritophages, bacteriophages and predators. Eusaprobionts - detritophages, feed on bacterial microflora in rotting plant debris. Davisaprobionts are semi-saprobiotic nematodes; feed on dead plant cells both in plants and in basal soil. Mycophages feed on the mycelium of fungi and plant roots. True parasites feed only on living plant tissue. Depending on the location of the nematodes, they were divided into external and internal (root and leaf) parasites.
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Narzullaev, Sardor Baxriddinovich; Mavlyanov, Ochil Mavlyanovich; and Xakimov, Najmiddin Xakimovich
"FEATURES OF VERTICAL DISTRIBUTION OF PHYTONEMATODES UNDER CONDITIONS OF THE KARATEPIN MOUNTAIN ECOSYSTEMS,"
Bulletin of Gulistan State University: Vol. 2020
, Article 23.
Available at: https://uzjournals.edu.uz/gulduvestnik/vol2020/iss1/23