Plants lack the ability to independently fix atmospheric nitrogen
Plants cannot independently fix atmospheric nitrogen and instead rely on symbiotic relationships with nitrogen-fixing microorganisms such as rhizobia.
The retrieved papers consistently establish that higher plants lack the metabolic machinery to independently fix atmospheric nitrogen (N2) and instead depend entirely on symbiotic or mutualistic relationships with specialized diazotrophic bacteria, such as rhizobia, which perform the nitrogen fixation process in exchange for plant photosynthates. Because all provided evidence uniformly supports the claim that plants cannot fix nitrogen independently, the balance verdict is SUPPORTED.
Yuliya Serazetdinova, Ekaterina Borodina, Natalya Fotina, Adarsh Naik, Gaurav Mudgal, Lyudmila Asyakina. Rhizobia as complex biofertilizers for wheat: Biological nitrogen fixation and plant growth promotion. 2025. https://doi.org/10.21603/2308-4057-2026-1-669
Notes that plants rely on symbiotic bacteria like rhizobia to acquire fixed atmospheric nitrogen rather than doing it independently.
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Leroy T, Goormachtig S, Van Dingenen J. Unraveling carbon dynamics in legume-rhizobia symbioses: toward a single-cell resolution of symbiotic metabolism.. 2026. https://doi.org/10.1093/jxb/erag342
Explains that legumes acquire nitrogen via a symbiotic interaction with diazotrophic rhizobia bacteria.
Kaste JAM, Ji R, Sydow P, Sawers RJH, Matthews ML. Metabolic modeling predicts synergistic growth benefits between arbuscular mycorrhizal fungi and theoretical N2-fixing rhizobia symbiosis in maize.. 2026. https://doi.org/10.1093/plphys/kiag327
Discusses strategies for engineering nitrogen-fixing rhizobia symbioses in cereal crops that otherwise lack this ability.
Ranjan P, Das D, Bundela V, Ramesh A, Verma RK, Nargund R, Manandhar U, Drijber R, Upadhyay RK, Sharma MP. Role of rhizosphere specific microbiome in enhancing soybean productivity across contrasting soil and crop management systems.. 2026. https://doi.org/10.3389/fpls.2026.1830235
Highlights that plants utilize symbiotic rhizobium interactions to enhance nitrogen acquisition.
Shi Y, Liu H, Yang W, Zhai J, Wang H. Advances in single-cell and spatial omics for studying symbiotic nitrogen fixation: comparative cellular and evolutionary perspectives.. 2026. https://doi.org/10.1186/s13059-026-04024-y
Notes that engineering symbiotic nitrogen fixation in non-legume crops relies on transferring microbial symbioses mechanisms.
Khater AK, Kirui CK, Njeru EM, Githiri SM. 16S rRNA-based genetic diversity and symbiotic efficiency of indigenous cowpea-nodulating rhizobia from semiarid Eastern Kenya.. 2026. https://doi.org/10.3389/fmicb.2026.1875429
Evaluates indigenous cowpea-nodulating rhizobia that establish symbiotic relationships to supply plants with nitrogen.
Wang T, Wang F, Su S, Yan L, Hao Z, Xu J, Han H, Wu Y, Li D, Zhang S. Engineering Symbiotic Nitrogen Fixation for Agriculture: Predominant Role of Host Plants and Fine-Tuning Regulation.. 2026. https://doi.org/10.3390/plants15081256
Focuses on symbiotic nitrogen fixation provided by rhizobia as a sustainable nitrogen source for plants.
Leemann RG, Liu Y, Hjørungnes M, Bailly A, Bellés-Sancho P, Pessi G. <i>Paraburkholderia phymatum</i> STM815<sup>T</sup> Pectate Lyase Has a Negative Impact on Nitrogen-Fixing Symbiosis with Common Bean.. 2026. https://doi.org/10.3390/ijms27052119
Examines nitrogen-fixing rhizobia symbioses in legumes and common beans.
Khantsi M, Babalola OO. Influence of Cowpea Plants on Soil Bacterial Community and Soil Quality: Effects of the Rhizosphere.. 2026. https://doi.org/10.1002/pei3.70157
Describes how plants exchange carbon for symbiotically fixed nitrogen provided by rhizobia bacteria.
Ricks K, Schwarz C, Blaszynski M, Gonzalez D, Lau JA, Heath K, Yannarell A. Mutualisms as engines for rapid adaptation: Rhizobium evolution facilitates plant drought resistance. 2026. https://doi.org/10.64898/2026.07.14.738479
Notes that plants associate with nitrogen-fixing rhizobium mutualists to obtain necessary nitrogen.
Suwa T, Lau JA. The role of microbial resource mutualists in plant adaptation to abiotic environments.. 2026. https://doi.org/10.1093/evolut/qpag113
Indicates that plants depend on rhizobia bacteria carrying mobile genetic elements to fix nitrogen.
Montoya AP, Jensen KT, Griffitts JS, Porter SS. The evolutionary genomics of novel endosymbiosis in wild rhizobia bacteria.. 2026. https://doi.org/10.1016/j.cub.2026.04.071
Discusses how plants rely on symbiotic partnerships with bacteria to access fixed nitrogen.
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