root nodule

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root nodule

[′rüt ′näj‚ül]
(plant pathology)
An abnormal nodular growth on a plant root system caused by the establishment of symbiotic nitrogen-fixing bacteria in the host tissue.
References in periodicals archive ?
Mhamdi R, Laguerre G, Aouani ME, Mars M, Amarger N (2002) Different species and symbiotic genotypes of field rhizobia can nodulate Phaseolus vulgaris in Tunisian soils.
Information is virtually lacking on the symbiotic properties of indigenous populations of rhizobia and their capacity to nodulate and fix nitrogen when in symbiosis with locally-adapted cultivars of Phaseolus and other legume species grown in southern Texas.
Basal area of propodeum strongly striate, posterior edge strongly imbricate; lateral surface rugose, ventrally with a few striae; posterior surface minutely reticulate, slightly nodulate and double-punctate, bigger punctures separated by about three times a puncture width, surface bordered by carinae.
Of the plants without NA, tamarack rhizosphere nitrogenase activity is not reported in the literature, but species of Myrica nodulate with Frankia to become diazotrophic (Troelstra and others, 1992; Young and others, 1992).
There is no point inoculating legume seedlings with strains that don't effectively nodulate with that species.
Surveys of bacteria associated with domesticated legumes typically find very wide heterogeneity in plant growth with different isolates, including some isolates that nodulate plants without providing any benefit at all to their hosts (e.
Studying the occurrence of these organisms in the soil, especially those that nodulate leguminous crops, is relevant for the succession of crops and as a strategy to recover degraded areas, particularly in soils of low natural fertility, such as that of the present study.
The tested tree species differed in their capability to nodulate by the Rhizobium isolates.
Poor soil conditions and intermittent or terminal drought are factors that contribute to the weak ability of Phaseolus vulgaris beans to nodulate and fix atmospheric nitrogen in symbiosis [4, 13, 15].
However, it is not obvious why lineage I bacteria were so strongly dominant in nodule samples from biotype C plants, because the laboratory experiments showed that biotype C hosts could nodulate abundantly with all bacterial lineages present at this site.