Document Detail

60Ma of legume nodulation. What's new? What's changing?
MedLine Citation:
PMID:  18209109     Owner:  NLM     Status:  MEDLINE    
Current evidence suggests that legumes evolved about 60 million years ago. Genetic material for nodulation was recruited from existing DNA, often following gene duplication. The initial process of infection probably did not involve either root hairs or infection threads. From this initial event, two branched pathways of nodule developmental processes evolved, one involving and one not involving the development of infection threads to 'escort' bacteria to young nodule cells. Extant legumes have a wide range of nodule structures and at least 25% of them do not have infection threads. The latter have uniform infected tissue whereas those that have infection threads have infected cells interspersed with uninfected (interstitial) cells. Each type of nodule may develop indeterminately, with an apical meristem, or show determinate growth. These nodule structures are host determined and are largely congruent with taxonomic position. In addition to variation on the plant side, the last 10 years have seen the recognition of many new types of 'rhizobia', bacteria that can induce nodulation and fix nitrogen. It is not yet possible to fit these into the emerging pattern of nodule evolution.
Janet I Sprent
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Publication Detail:
Type:  Journal Article; Review     Date:  2008-01-21
Journal Detail:
Title:  Journal of experimental botany     Volume:  59     ISSN:  1460-2431     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2008  
Date Detail:
Created Date:  2008-03-19     Completed Date:  2008-05-08     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  1081-4     Citation Subset:  IM    
Division of Applied and Environmental Biology, University of Dundee, Dundee DD1 4HN, Scotland, UK.
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MeSH Terms
Bacteria / isolation & purification
Bacterial Physiological Phenomena
Fabaceae / growth & development,  microbiology*
Root Nodules, Plant / microbiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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