Improvement of rhizobium-soybean symbiosis and nitrogen fixation under drought

dc.contributor.authorKibido, Tsholofelo Reineth
dc.contributor.authorKunert, Karl J.
dc.contributor.authorMakgopa, Matome Eugene
dc.contributor.authorGreve, Michelle
dc.contributor.authorVorster, Juan
dc.contributor.emailjuan.vorster@up.ac.zaen_ZA
dc.date.accessioned2021-06-25T13:45:40Z
dc.date.available2021-06-25T13:45:40Z
dc.date.issued2020-02
dc.description.abstractThe symbiotic interaction between soybean plants and rhizobacteria can be severely affected by drought, which results in a reduction in symbiotic nitrogen fixation and ultimately decreased yields. The aim of our research was to determine whether symbiotically efficient rhizobia that can better tolerate soil water deficits can improve nodule performance in plants subjected to drought. Firstly, rhizobial strains were selected that exhibited differences in tolerance to salt (NaCl) or water deficit (PEG 6000). Sinorhizobium fredii strain SMH12 showed the highest tolerance to these treatments while Bradyrhizobium diazoefficiens strain WB74‐1 showed the lowest tolerance. Greenhouse‐grown Prima 2000 soybean plants were then inoculated with either SMH12 or WB74‐1 and subjected to two water deficit regimes. Different nodule and plant growth traits were determined, including nodule number, dry weight, water potential, and the accumulation of malondialdehyde and ureide. Plants inoculated with SMH12 had significantly more nodules under water deficit conditions than those inoculated WB74‐1, despite having lower root and shoot biomass. SMH12‐inoculated plants had higher nodule water potentials and lower malondialdehyde contents than the WB74‐1‐inoculated plants. These results demonstrate that inoculation of soybean plants with the more water deficit‐tolerant S. fredii strain improved nodule characteristics when plants were grown under water deficit conditions. However, these improved nodule characteristics do not always directly translate into better plant growth.en_ZA
dc.description.departmentForestry and Agricultural Biotechnology Institute (FABI)en_ZA
dc.description.departmentPlant Production and Soil Scienceen_ZA
dc.description.librarianpm2021en_ZA
dc.description.sponsorshipUniversity of Pretoria; NRF/DST; Oil and Protein Development Trust (OPOT); Sasol Agriculture trust in South Africa; NRF Young researcher development grant (112144) (BJV).en_ZA
dc.description.urihttp://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2048-3694en_ZA
dc.description.urihttps://wileyonlinelibrary.com/journal/fes3en_ZA
dc.identifier.citationKibido T, Kunert K, Makgopa M, Greve M, Vorster J. Improvement of rhizobium‐soybean symbiosis and nitrogen fixation under drought. Food and Energy Security 2020;e177. https://doi.org/10.1002/fes3.177.en_ZA
dc.identifier.issn2048-3694 (online)
dc.identifier.other10.1002/fes3.177
dc.identifier.urihttp://hdl.handle.net/2263/80619
dc.language.isoenen_ZA
dc.publisherWiley Open Accessen_ZA
dc.rights© 2019 The Authors. Food and Energy Security published by John Wiley & Sons Ltd. and the Association of Applied Biologists. This is an open access article under the terms of the Creative Commons Attribution License.en_ZA
dc.subjectDroughten_ZA
dc.subjectNitrogen fixationen_ZA
dc.subjectOsmotoleranceen_ZA
dc.subjectRhizobiumen_ZA
dc.subjectSoybeanen_ZA
dc.titleImprovement of rhizobium-soybean symbiosis and nitrogen fixation under droughten_ZA
dc.typeArticleen_ZA

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