Conservation and divergence of signalling pathways between roots and soil microbes - the Rhizobium -legume symbiosis compared to the development of lateral roots, mycorrhizal interactions and nematode-induced galls
Date
2003
Authors
Mathesius, Ulrike
Journal Title
Journal ISSN
Volume Title
Publisher
Kluwer Academic Publishers
Abstract
This review compares endophytic symbiotic and pathogenic root-microbe interactions and examines how the development of root structures elicited by various micro-organisms could have evolved by recruitment of existing plant developmental pathways. Plants are exposed to a multitude of soil micro-organisms which affect root development and performance. Their interactions can be of symbiotic and pathogenic nature, both of which can result in the formation of new root structures - how does the plant regulate the different outcomes of interactions with microbes? The idea that pathways activated in plant by micro-organisms could have been 'hijacked' from plant developmental pathways is not new, it was essentially proposed by P. S. Nutman in 1948, but at that time, the molecular evidence to support that hypothesis was missing. Genetic evidence for overlaps between different plant-microbe interactions have previously been examined. This review compares the physiological and molecular plant responses to symbiotic rhizobia with those to arbuscular mycorrhizal fungi, pathogenic nematodes and the development of lateral roots and summarises evidence from both molecular and cellular studies for substantial overlaps in the signalling pathways underlying root-micro-organism interactions. A more difficult question has been why plant responses to micro-organisms are so similar, even though the outcomes are very different. Possible hypotheses for divergence of signalling pathways and future approaches to test these ideas are presented.
Description
Keywords
Keywords: arbuscular mycorrhiza; gall; host-symbiont interaction; legume; nematode; nodulation; rhizobacterium; root system; Arbuscular mycorrhizae; Fungi; Mycorrhizae; Nematoda; Rhizobium Arbuscular mycorrhiza; Auxin; Flavonoids; Lateral root formation; Nematode galls; Nodulation
Citation
Collections
Source
Plant and Soil
Type
Journal article
Book Title
Entity type
Access Statement
License Rights
Restricted until
2037-12-31