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    DIVERSITY AND METABOLIC POTENTIAL OF CULTURABLE N2-FIXING AND P-SOLUBILISING BACTERIA FROM RHIZOSPHERE OF WILD CROPS IN VAN LAKE BASIN -TURKEY
    (Pakistan Botanical Soc, 2024) Erman, Murat; Kotan, Recep; Cakmakci, Ramazan; Cig, Fatih; Karagoez, Kenan; Soenmez, Ferit; EL Sabagh, Ayman
    The diversity of phosphate solubilizing and nitrogen -fixing bacteria from rhizospheric soil samples of different plant species (native wild cereals, beet, stonecrops, onion, rose, raspberry, and 10 other plant genera) grown at four different locations in the Van Lake Basin, Turkey were investigated. A total of 169 rhizosperic soil samples were gathered from these plant species, and over 777 rhizoplane bacteria were haphazardly selected from agar -solidified trypticase soy broth and examined for fatty acid methyl ester (FAME) reports. As a result, 57 bacterial genera were recognised, which 64.8% gone to five genera viz., Bacillus (29.6%), Pseudomonas (9.8%), Stenotrophomonas (9.7%), Paenibacillus (5.7%), Micrococcus (5.1%), and Arthrobacter (4.9%). Approximately 56.8% of bacteria were found to be gram -positive (GPB), while 43.2% as gram -negative bacteria (GNB). In the of total GPB, 56.3% were N2 -fixing bacteria and 46.6% were P-solubilising bacteria, while in the case of GNB, 43.7% were N2 -fixing bacteria and 53.4% were P-solubilising bacteria. A total of 651 bacteria were isolated from the rhizospheric samples of the 20 plant genera, and subjected to further analysis. Of the 651 isolates, 542 were able to fix nitrogen, 279 were able to solubilize phosphates, and 247 isolates could fix both nitrogen and solubilize phosphates all at once. Bacillus, Pseudomonas, Stenotrophomonas, Paenibacillus, Micrococcus, Serratia, and Pantoea genera were the most prominent N2 -fixing and P-solubilising groups. Additionally, B. megaterium, B. atrophaeus, B. cereus, B. pumilus, B. licheniformis, B. subtilis, Pb. polymyxa, Pb. macerans, Pb. macquariensis, Bb. choshinensis, Ste. maltophilia, Ps. fluorescens, Ps. putida, Ps. stutzeri, Pn. agglomerans, Mic. luteus, Rco. erythropolis, Kocuria rosea, Csb. Meningosepticum, and Serratia fonticola were the mainly frequent P-solubilising and N2 -fixing species in the native rhizosphere soils of plants.
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    Effects of environmentally friendly plant growth promoting bacteria on dry matter yield in high elevation rangelands of Turkey
    (Range Management Society of India, 2021) Güllap, Mehmet Kerim; Yıldırım, N. Zeynep; Çomaklı, Binali; Çakmakçı, Ramazan; Kotan, Recep
    This study was carried out on high-elevation rangelands of Erzurum, Turkey between 2011 and 2014 for four-years period. The goal of this study was to determine the effects of plant growth-promoting bacteria (PGPB) on dry matter yield of rangelands. Based on the results of our study, DM yield, resulting from most of the treatments with bacterial strains plus 50% N or 50% N+P fertilizers were higher than treatments of bacterial strains without fertilizers. Although 100% N+P and N fertilizer without bacterial strains produced higher DM yield than check plots and bacteria alone treatments, the treatments that received half of N + P fertilizer with bacteria strains were significantly higher than 100% N and 100% N+100% P fertilizer and the other treatments, except the treatments with Pantoea agglomerans (treatment 18) strain with half doses of N+P. Among the treatments tested, half of N fertilizer with Pseudomonas fluorescens T26 strain gave higher DM yield than in optimum NP fertilizer (10 kg N da-1 + 5 kg P2 O5 da-1) but yield increase was not statistically different. Results of this study showed that applied half of N fertilizer with PGPB may be effective to increase DM yield of rangelands and to reduce chemical fertilizer use. © 2021, Range Management Society of India.
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    Effects of Root Plant Growth Promoting Rhizobacteria Inoculations on the Growth and Nutrient Content of Grapevine
    (Taylor & Francis Inc, 2018) Erdogan, Ummugulsum; Turan, Metin; Ates, Fadime; Kotan, Recep; Cakmakci, Ramazan; Erdogan, Yasar; Kitir, Nurguel
    The objective of this study was to evaluate the effects of seven nitrogen (N-2)-fixing and/or phosphorus (P)-solubilizing and siderophore-producing microorganism based bio-fertilizers in single and triple strain combinations isolated from the acidic rhizospheric soil of native tea, grapevine, and wild red raspberries. As a result of this study, bacterial efficiency was found to be variable and depended on the bacterial strains and evaluated growth parameters. Plant growth-promoting rhizobacteria (PGPR) has improved macro- and micro-nutrient concentrations in grapevine leaves, and stimulated plant growth. Triple inoculation and single inoculation based bio fertilizers were found to stimulate overall plant growth, including shoot and leaf weight, main shoot length, leaf ground index, chlorophyll, nitrogen, zinc and iron content of grapevine cv Italy'. Bio-fertilizers increased the nutrients such as nitrogen, zinc and iron concentrations and consequently increased the chlorophyll content of the leaves.