nodule

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Related to nodulation: Root nodules

nodule:

see concretionconcretion,
mass or nodule of mineral matter, usually oval or nearly spherical in shape, and occurring in sedimentary rock. It is formed by the accumulation of mineral matter in the pore spaces of the sediment, usually around a fossil or fossil fragment acting as a nucleus.
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nodule

[′näj·ül]
(anatomy)
A small node.
A small aggregation of cells.
(botany)
A bulbous enlargement found on roots of legumes and certain other plants, whose formation is stimulated by symbiotic, nitrogen-fixing bacteria that colonize the roots.
(geology)
A small, hard mass or lump of a mineral or mineral aggregate characterized by a contrasting composition from and a greater hardness than the surrounding sediment or rock matrix in which it is embedded.
(medicine)
A primary skin lesion, seen as a circumscribed solid elevation.

nodule

1. any of the knoblike outgrowths on the roots of clover and many other legumes: contain bacteria involved in nitrogen fixation
2. Anatomy any small node or knoblike protuberance
3. a small rounded lump of rock or mineral substance, esp in a matrix of different rock material
References in periodicals archive ?
Fifty seven per cent of the isolates have induced nodulations in the host plant Lathyrus ochrus.
High genetic diversity in cultivated soils can be due to high demand for nitrogen by the plants, which in turn stimulate nodulation resulting in rhizobia proliferation [45].
R.sullae is characterized by the production of high molecular weight and low molecular weight EPS, the latter having a structure rich in fucose (30%), which increases the nodulation efficiency in the species.
Some micronutrient preparations are acidic and therefore likely to cause reduced nodulation effectiveness.
Smith, "Bradyrhizobium japonicum mutants allowing improved nodulation and nitrogen fixation of field-grown soybean in a short season area," Journal of Agricultural Science, vol.
The lipochitin oligosaccharides, the specific signaling molecules, initiate the process of host plant nodulation. Nod factors trigger the series of responses of legume plants such as deformation of root hairs, formation of infectious threads (cytoplasmic bridge), and division of cortical cells, leading to nodules formation [3, 4].
Upon reinoculation of the host plant, all the isolates from Kisumu and four from MMUST initiated nodulation (Figure 1) and were hence confirmed as root-nodule bacteria.
Leguminous plants and rhizobia maintain a symbiotic relationship, where the rhizobium cannot bring about nodulation and nitrogen fixation without a supply of photosynthates from the host plants.
(2001) Potential for enhancement of root growth and nodulation of soybean coinoculated with Azospirillum and Bradyrhizobium in laboratory systems.