Meaning of root nodules, plant. Swelling on roots, especially of LEGUMES, which is often related to RHIZOBIUM infection functioning for NITROGEN FIXATIONRoot nodules may … ‘Nitrogen-fixing bacteria in the root nodules of leguminous plants (such as peas and clover) take in nitrogen direct from the air and pass it on to the plant, both feeding the plant and enriching the soil.’ All higher plants show developmental plasticity in response to the availability of nitrogen (N) in the soil. Root Nodules, Plant (n.). 1. We isolated two MsENOD40 clones, designated MsENOD40–1 and MsENOD40–2, with distinct promoters from an alfalfa ( Medicago sativa cv Chief) genomic library. Nodule definition is - a small mass of rounded or irregular shape: such as. The first is making nitrogen available for the current crop. The nodules do this in conjunction with a specific type of bacteria, of the genus Rhizobium. Basically, these bacteria form a symbiotic relationship with legume plants that helps the beans and peas get additional nutrients. ENOD40 , an early nodulin gene, is expressed following inoculation with Rhizobium meliloti or by adding R. meliloti -produced nodulation (Nod) factors or the plant hormone cytokinin to uninoculated roots. Root nodules capture nitrogen from the air, convert it to ammonia, and then break that down into more usable forms for the plant. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia. In legumes, N starvation causes the formation of root nodules, where symbiotic rhizobacteria fix atmospheric N 2 for the host in exchange for fixed carbon (C) from the shoot. The second is when the plants are tilled under after the harvest. Information and translations of root nodules, plant in the most comprehensive dictionary definitions resource on the web. The nodule is a highly specialized organ [1].Two morphological types of nodules are known and they are determined by the plant host (Figure 10-1).The first type is called indeterminate and these nodules occur on clover and alfalfa, for example. Albini's n's gray nodules of the size of small grains, sometimes seen on the free edges of the atrioventricular valves of infants; they are remains of fetal structures. Many types of plants, both woody and herbaceous, can be propagated by stem cuttings, a process that yields a plant identical to its parent. These nodules help feed the plant and other surrounding plants. Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. What “fixing” means is that the nodules absorb nitrogen from the air and convert it into ammonia in a useable form (NH3) that the plants can readily take up for growth. Definition of root nodules, plant in the Definitions.net dictionary. The plants then develop nodules which house the bacteria. For successful rooting, cut immediately below … How to use nodule in a sentence. nodule [nod´ūl] a small node that is solid and can be detected by touch. They appear as modified lateral roots with a terminal apical meristem, but with lateral vascular tissue. Root nodule - Wikipedia. Here, we tested whether plastic responses to internal [N] of legumes are altered by their symbionts. A 6-inch or longer cutting is taken from the parent plant for rooting in the soil. This fixing action has a two-fold effect. What does root nodules, plant mean? Legume, also called pod, fruit of plants in the pea family ().Most legumes are dehiscent fruits that release their seeds by splitting open along two seams, though some, such as peanuts (Arachis hypogaea) and carobs (Ceratonia siliqua), do not naturally open.The fruits come in a variety of sizes and shapes; many, however, are long and narrow and bear their seeds in a single line. 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