Related Experiment Video
Updated: Jun 26, 2026

Plant Promoter Analysis: Identification and Characterization of Root Nodule Specific Promoter in the Common Bean
Published on: December 23, 2017
Initiation of a legume nodule with an indeterminate meristem involves proliferating host cells that harbour infection
Vera A Voroshilova1, Kirill N Demchenko1,2, Nicholas J Brewin3
1All-Russia Research Institute for Agricultural Microbiology, Laboratory of Genetics of Plant-Microbe Interactions, Podbelsky chaussee 3, 196608, Pushkin 8, St Petersburg, Russia.
Abstract:
A comparative analysis of nodule morphogenesis was carried out for three symbiotically defective pea (Pisum sativum) mutants that show abnormalities in nodule development.In the wild-type lines, resumption of cell proliferation in the pericycle and inner cortex results in the development of a nodule primordium, within which are found proliferating cells that harbour infection threads. However, this class of cell is not observed in the mutants RisFixA (sym41) and SGEFix–-2 (sym33) where nodule development is arrested at the point of formation of the apical nodule meristem. Itis proposed that the presence of proliferating cells harbouring infection threads is a prerequisite for normal formation of the nodule meristem.In mutant SGEFix–-1 (sym40), nodule development does not differ from that of wild-type plants in the early stages but is blocked at the stage after nodule meristem persistence. A scheme is proposed for the sequential functioning of pea symbiotic genes Sym33, Sym40 and Sym41 in the programme of nodule development.
More Related Videos
Related Concept Videos
Microbe-Plant Interactions
Colonisation of Pathogens
Primary and Secondary Growth in Roots and Shoots
Infection
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
Morphogenesis
The Roles of Bacteria and Fungi in Plant Nutrition

