Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. [1] Under nitrogen -limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia. [2]

2020年1月1日 · Nodulating plants include actinorhizal plants, Parasponia and the economically important legume family. In this chapter, we will describe the diversity of nodule shapes, the molecular mechanisms underlying the inception of nodule primordia, as well as the development and the maintenance of the symbiotic organ.

There are two main types of nodules found in plants: root nodules and stem nodules. Root nodules are the most common and are found on the roots of leguminous plants such as peas, beans, and clover. Stem nodules, on the other hand, are less common and are usually found on woody plants in specific ecosystems.

Root nodules are well-organized structures produced on the roots of most legume plants after inoculation with certain, mostly nitrogen-fixing species of bacteria of the genus Rhizobium and, to a lesser extent, by bacteria of the genera Bradyrhizobium and Azorhizobium.

1999年11月11日 · Symbiotic nitrogen-fixing root nodules on legumes are founded by root cortical cells that de-differentiate and restart cell division to establish nodule primordia.

In summary, legumes balance the number of nodules formed with the plant’s need for N by the integration of the outputs of at least three signaling pathways. Both local and systemic, these pathways include a pathway for nodule initiation, an inhibitory pathway for nodule number (AON), and an inhibitory pathway based on N sufficiency.

2023年12月1日 · Root nodule development plays a vital role in establishing the mutualistic relationship between legumes and nitrogen-fixing rhizobia. Two primary processes are involved in nodule development: formative cell divisions in the root …

Recent progress in symbiosis has revealed several key components of host plants required for nitrogen-fixing nodule organogenesis, in which complicated metabolic and signaling pathways in the host plant are reprogrammed to generate nodules in the cortex upon perception of the rhizobial Nod factor.

Legumes and a few plant species are capable of forming root nodules on their roots, in which plants have a mutual endosymbiotic relationship with nitrogen-fixing bacteria collectively called rhizobia (Oldroyd et al. 2011, Roy et al. 2020, Suzaki et al. 2015).

1 天前 · Legumes form root nodules with symbiotic nitrogen-fixing rhizobacteria, which require ample iron to ensure symbiosis establishment and efficient nitrogen fixation. The functions and mechanisms of ...