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Grönemeyer, J., Berkelmann, D., Mubyana-John, T., Haiyambo, D., Chimwamurombe, P., Kasaona, B., Hurek, T. and Reinhold-Hurek, B. 2013. A survey for plant-growth-promoting rhizo-bacteria and symbionts associated with crop plants in the Okavango region of Southern Africa. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 287–294


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A survey for plant-growth-promoting rhizo-bacteria and symbionts associated with crop plants in the Okavango region of Southern Africa.

Summary / Notes:

Regions in the Okavango catchment and delta such as highlands of Angola, the Kavango region of Namibia, and the Okavango Delta region of Botswana, although rich in plant diversity and density, have not produced significant yields when cropped by small scale farmers in the region. This phenomenon may be due to many factors among which is low nitrogen and other crop nutrients availability. This region due to its richness in flora may harbour bacteria which play a major role in plant nutrient availability. However, some of these rhizobacteria can be isolated and re-inoculated on crop plants to improve crop yields. Thus a survey on root nodulation of local pulses such as Vigna unguiculata, V. subterranea, and Phaseolus vulgaris, in the Chitembo area of Angola and the Kavango region of Namibia was carried out. Nodulated plants and putatively symbiotic bacteria were detected from a range of sites for all species. In Namibia, isolation of putative plant-growth-promoting rhizobacteria (PGPRs) was done on cereal crops and from other indigenous plants on farmland and from pristine areas. In Botswana, phosphate solubilizing bacteria were isolated from the roots of grasses in the floodplains and assayed for their ability to solubilize soil phosphate with the intention of using them to increase yields in sorghum (Sorghum vulgare). In total, 46 bacterial strains were isolated from nodules of legumes from Namibia, while 37 strains were isolated from Angola. Additionally, 32 strains of plant associated rhizobacteria were obtained from cereals or natural plants from the Kavango region in Namibia, and further ten isolates were selected from the Seronga region in Botswana. The large number of bacteria generated by this survey may contain some bacteria that may promote plant growth and improve soil fertility. Keywords: bambara groundnut, cowpea, nodule, Pennisetum glaucum, phosphate solubilizing bacteria, Rhizobium, sorghum.

Year: 2013

Type: Journal Article

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Schneibel, A., Stellmes, M., Revermann, R. and Finckh, M. 2013. Agricultural expansion during the post-civil war period in southern Angola based on bi-temporal Landsat data. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 311-319
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Große, L.M., Kowalski, B., Domptail, S. and Eigner, A. 2013. Seronga - The People. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 147-158
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Domptail, S., Große, L.M., Kowalski, B. and Baptista, J. 2013. Cusseque/Cacuchi - The People. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 73-80
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Zimmermann, I., Matzopoulos, R. and Kwaambwa, H.M. 2017. Options to improve soil fertility with national resources. Namibian Journal of Environment, 1(B): 7-15
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Steudel, T., Göhmann, H., Flügel, W-A. and Helmschrot, J. 2013. Assessment of hydrological dynamics in the upper Okavango River Basins. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 247–261
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Röder, A., Stellmes, M., Domptail, S., Eschenbach, A., Finckh, M., Gröngröft, A., Helmschrot, J., Pröpper, M., Schneibel, A. and Stoffels, J. 2013. Cumulative effects of policy and management actions on ecosystem services. Challenges and methodological approaches in The Future Okavango project. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 167–183
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Kgathi, D.L., Mmopelwa, G., Vanderpost, C., Wolski, P. and Motsholapheko, M.R. 2013. Impacts of desiccation on ecosystem services and household adaptation in the Okavango Delta, Botswana. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 263–277
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Herold, B., Große, L.M., Domptail, S., Kgathi, D.L., Falk, T., Azebaze, N. and Kowalski, B. 2013. Livelihood diversification in a rural community of the Okavango Delta, Botswana - Results from a Socio-Economic Baseline Survey. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 363–377
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Hinz, M.O. 2013. Makongoro are the Hafumu of water and we respect them, or the ethno-philosophical foundation of customary water law in the Kavango Region of Namibia. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 407–418
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Mubyana-John, T., Tarupiwa, L., Masamba, W.R.L. and Ringrose, S. 2013. Mechanisms of phosphate solubilisation associated with some rhizobacteria in floodplains, as exemplified by the Okavango Region of Seronga, Botswana. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 295–302
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Kralisch, S., Zander, F. and Flügel, W-A. 2013. OBIS - a Data and Information Management System for the Okavango Basin. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 213–220
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Pröpper, M., Falk, T., Domptail, S., Große, L.M. and Kowalski, B. 2013. Partly subsistent household economies and modern consumerism in the Namibian Kavango: Assets, income, expenditure and socio-economic stratification. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 379–391
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Tsheboeng, G. and Murray-Hudson, M. 2013. Spatial variation of population size structure of selected riparian tree species in the Okavango Delta, Botswana. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 341–350
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Wehberg, J., Bock, M., Weinzierl, T., Conrad, O., Böhner, J., Stellmes, M. and Landschreiber, L. 2013. Terrain-based Landscape Structure Classification in Relation to Remote Sensing Products and Soil Data for the Okavango Catchment. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 221–233
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Schneibel, A., Stellmes, M., Frantz, D., Finckh, M. and Revermann, R. 2013. Cusseque - Earth Observation. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 55-57
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Richter, F. 2013. Caiundo - Biodiversity of Birds. In: Oldeland, J., Erb, C., Finckh, M. and Jürgens, N. (eds). Environmental Assessments in the Okavango Region. Biodiversity and Ecology, 5: 97-100
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