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dc.contributor.authorCoyne, D.L.
dc.contributor.authorOyekanmi, E.
dc.date.accessioned2019-12-04T11:18:15Z
dc.date.available2019-12-04T11:18:15Z
dc.date.issued2007
dc.identifier.citationCoyne, D. & Oyekanmi, E. (2007). Symbiotic nitrogen fixation of two soybean genotypes as affected by rootknot nematodes and microsymbionts. Journal of Biological Sciences, 7(7), 1221-1226.
dc.identifier.issn1727-3048
dc.identifier.urihttps://hdl.handle.net/20.500.12478/3128
dc.description.abstractThe ability of soybean to symbiotically fix Nitrogen (N) was found to be substantially reduced (p≤0.05), after inoculation with root-knot nematode (Meloidogyne incognita). Galling, which is a commonly used indicator of root-knot crop damage, may provide less accurate information about reductions in the symbiotic N fixation of soybean. The experiments were undertaken in Nigeria in pots, using two soybean genotypes (TGx 1448-2E and TGx 1485-1D) with differential susceptibility to nematode. The microsymbionts Glomus mosseae (200 spores), Bradyrhizobium japonicum (106 cells mL1) and Trichoderma pseudokoningii (6.8x107 spores) were applied plant1. Treatments involving nematode inoculation had 1000 second-stage juveniles plant1. Ureide N (fixed N) in stems and petioles, nodulation score and activity, nematode infection and arbuscular mycorrhizal colonization were assessed at harvest using standard methods. Regression and correlation analyses demonstrated that root nematode densities assessed at harvest were highly correlated negatively (p≤0.001) with Symbiotic N Fixation (SNF) as measured from the ureide N. Results confirmed that inoculation of M. incognita reduced SNF, nodulation score, nodule activity and plant growth parameters. However, fixed N was not necessarily related to galling damage. Results indicated that nodulation score and galling may not be the most suitable parameters, by which levels of productivity or damage could be determined in the presence of Meloidogyne sp., but rather ureide N is a more accurate assessment of the effect of M. incognita on soybean.
dc.language.isoen
dc.subjectArbuscular Mycorrhiza
dc.subjectN Fixation
dc.subjectN Dependence
dc.subjectPlant-Parasitic Nematodes
dc.subjectRhizobial Nodulation
dc.subjectUreide N
dc.titleSymbiotic nitrogen fixation of two soybean genotypes as affected by rootknot nematodes and microsymbionts
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationUniversity of Ibadan
cg.coverage.regionAfrica
cg.coverage.regionWest Africa
cg.coverage.countryNigeria
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectPlant Diseases
cg.iitasubjectPests Of Plants
cg.iitasubjectGenetic Improvement
cg.iitasubjectSoybean
cg.accessibilitystatusLimited Access
local.dspaceid94594
cg.identifier.doihttp://dx.doi.org/10.3923/jbs.2007.1221.1226


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