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Tashkent, Uzbekistan

Khaitov B.,University of Natural Resources and Life Sciences, Vienna | Khaitov B.,Tashkent State Agrarian University | Patino-Ruiz J.D.,University of Natural Resources and Life Sciences, Vienna | Pina T.,University of Natural Resources and Life Sciences, Vienna | And 2 more authors.
Ecology and Evolution

Aboveground plant performance is strongly influenced by belowground microorganisms, some of which are pathogenic and have negative effects, while others, such as nitrogen-fixing bacteria and arbuscular mycorrhizal fungi, usually have positive effects. Recent research revealed that belowground interactions between plants and functionally distinct groups of microorganisms cascade up to aboveground plant associates such as herbivores and their natural enemies. However, while functionally distinct belowground microorganisms commonly co-occur in the rhizosphere, their combined effects, and relative contributions, respectively, on performance of aboveground plant-associated organisms are virtually unexplored. Here, we scrutinized and disentangled the effects of free-living nitrogen-fixing (diazotrophic) bacteria Azotobacter chroococcum (DB) and arbuscular mycorrhizal fungi Glomus mosseae (AMF) on host plant choice and reproduction of the herbivorous two-spotted spider mite Tetranychus urticae on common bean plants Phaseolus vulgaris. Additionally, we assessed plant growth, and AMF and DB occurrence and density as affected by each other. Both AMF alone and DB alone increased spider mite reproduction to similar levels, as compared to the control, and exerted additive effects under co-occurrence. These effects were similarly apparent in host plant choice, that is, the mites preferred leaves from plants with both AMF and DB to plants with AMF or DB to plants grown without AMF and DB. DB, which also act as AMF helper bacteria, enhanced root colonization by AMF, whereas AMF did not affect DB abundance. AMF but not DB increased growth of reproductive plant tissue and seed production, respectively. Both AMF and DB increased the biomass of vegetative aboveground plant tissue. Our study breaks new ground in multitrophic belowground-aboveground research by providing first insights into the fitness implications of plant-mediated interactions between interrelated belowground fungi-bacteria and aboveground herbivores. Our study provides a key example of the interrelated effects of two primarily plant-mutualistic microorganisms, mycorrhizal fungi and free-living nitrogen-fixing bacteria, on herbivorous spider mites feeding on aboveground plant parts. It breaks new ground in multi-trophic below-aboveground research by providing first insights into the implications of plant-mediated belowground fungi-bacteria interactions on fitness of aboveground herbivores. © 2015 Published by John Wiley & Sons Ltd. Source

Kaipnazarov T.N.,Academy of Sciences of Uzbekistan | Mukhamedov N.S.,Academy of Sciences of Uzbekistan | Okmanov R.Ya.,Academy of Sciences of Uzbekistan | Berdimbetova G.E.,Academy of Sciences of Uzbekistan | Zhonkhozhaeva F.B.,Tashkent State Agrarian University
Russian Journal of Organic Chemistry

The reaction of 1-methyl-1H-benzimidazol-2-amine with arenesulfonyl chlorides in the presence of triethylamine afforded 1-arenesulfonyl-3-methyl-2, 3-dihydro-1H-benzimidazol-2-imines instead of expected N-(1-methyl-1H- benzimidazol 2-yl)arenesulfonamides. © 2013 Pleiades Publishing, Ltd. Source

Iskandarov Z.S.,Tashkent State Agrarian University | Halimov A.S.,Academy of Sciences of Uzbekistan
Applied Solar Energy (English translation of Geliotekhnika)

In the current paper, the numerical calculation of useful power received from the regeneration of the exhaust drying agent in a solar-fuel drying installation is presented. The useful power of solar radiation is defined at the given values of the environment. © 2014, Allerton Press, Inc. Source

Mambetnazarov A.B.,Tashkent State Agrarian University
Bulgarian Journal of Agricultural Science

In article is considered total water consumption cotton plant depending on soil-meliorations’ of the zone, mechanical composition of ground in layer of the aerations and constructions, adding soil of water, level soil of water and their mineralization. The Republic of Karakalpakstan is located north of the area of world cotton production. In relation to climate of the region refer to the desert zone. Annual precipitation is 80–100 mm, and the total evaporation is 10–12 times greater than precipitation. Therefore, under these conditions, agriculture is based solely on artificial irrigation. It is therefore necessary to determine the components of the water balance equation soils under cotton. The results of research conducted on the 2009–2014 in farm “Kuat” Chimbay region suggests that the total water consumption of cotton fields depends on the depth of groundwater. Lowering of the groundwater causes the flow of irrigation water increases. The main incoming part of the water balance in soils automorphic series (GWL < 3 m) of irrigation water, less importance rainfall and soil moisture created is not growing season. The total water consumption of cotton on irrigated soils is automorphic series – 6790 m3/ha. The share of irrigation in total water consumption norms cotton field is 58.9%, soil moisture, 34.4%, and 6.6% of precipitation. Transpiration expended 65.5%, evaporation from the soil surface of 40.3%. © 2016, National Centre for Agrarian Sciences. All rights reserved. Source

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