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Combined with two legumes adopted as model systems, Medicago truncatula and Lotus japonicus, genetic studies have led to a wealth of information on the signaling involved in establishing and regulating nodule development . This review addresses two systemic pathways, autoregulation of nodulation (AON), which involve control of nodule numbers in response to the establishment of symbiosis, the ...
Actinorhizal-type nodules are markedly different structures found in non-legumes. In this type, cells derived from the root cortex form the infected tissue, and the prenodule becomes part of the mature nodule. Despite this seemingly major difference, it is possible to produce such nodules in legumes by a single homeotic mutation. [14]
Apr 4, 2022 · Studies have found that unmanaged, wild legumes have a higher diversity of non-rhizobia endophytes than domesticated legumes. Because nodulation is an energetically costly symbiosis for the host plant, the prevalence of non-rhizobia in root nodules suggests that they provide another important service to ‘earn their keep’.
Dec 3, 2009 · Nodules in the family Leguminosae come in many different shapes and forms, depending partly on the host that bears them. This review focuses on the peripheral tissues that surround the infected tissues of four anatomically distinct classes of nodules: nodules with indeterminate meristems (from the Trifolieae and Fabeae tribes); desmodioid nodules with determinate meristems (from the Phaseoleae ...
Nov 23, 2024 · Figure: Root Nodules: Root nodules are formed when nitrogen fixing bacteria called rhizobia enter the cells of a host plant. Rhizobia normally live in the soil and can exist without a host plant. However, when legume plants encounter low nitrogen conditions and want to form a symbiotic relationship with rhizobia they release flavinoids into the soil.
Nodule development and senescence also have specific features. Whereas multiple review articles have described the early steps of nodu le formation and functioning, the rupture of the interaction has not been reviewed recently. In this context, this review focuses on the different characteristics of root nodule senescence. 2.
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May 28, 2018 · Interestingly, the response seems to be contingent on the source of nitrogen, as nitrate and ammonia have a strong inhibitory effect on nodule development, while urea generally does not, with some species-specific exceptions reported (e.g., cowpea; Dart & Wildon, 1970; Vigue, Harper, Hageman, & Peters, 1977). This is an area that requires further attention at the molecular-genetic level.
