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Indole-3-acetic acid-regulated genes in Rhizobium etli CNPAF512. 2009

Stijn Spaepen, and Frederik Das, and Ellen Luyten, and Jan Michiels, and Jos Vanderleyden
Centre of Microbial and Plant Genetics and INPAC, K.U. Leuven, Heverlee, Belgium.

In the rhizosphere and their interaction with plants rhizobia encounter many different plant compounds, including phytohormones like auxins. Moreover, some rhizobial strains are capable of producing the auxin, indole-3-acetic acid (IAA). However, the role of IAA for the bacterial partner in the legume-Rhizobium symbiosis is not known. To identify the effect of IAA on rhizobial gene expression, a transposon (mTn5gusA-oriV) mutant library of Rhizobium etli, enriched for mutants that show differential gene expression under microaerobiosis and/or addition of nodule extracts as compared with control conditions, was screened for altered gene expression upon IAA addition. Four genes were found to be regulated by IAA. These genes appear to be involved in plant signal processing, motility or attachment to plant roots, clearly demonstrating a distinct role for IAA in legume-Rhizobium interactions.

UI MeSH Term Description Entries
D007210 Indoleacetic Acids Acetic acid derivatives of the heterocyclic compound indole. (Merck Index, 11th ed) Auxin,Auxins,Indolylacetic Acids,Acids, Indoleacetic,Acids, Indolylacetic
D007887 Fabaceae The large family of plants characterized by pods. Some are edible and some cause LATHYRISM or FAVISM and other forms of poisoning. Other species yield useful materials like gums from ACACIA and various LECTINS like PHYTOHEMAGGLUTININS from PHASEOLUS. Many of them harbor NITROGEN FIXATION bacteria on their roots. Many but not all species of "beans" belong to this family. Afzelia,Amorpha,Andira,Baptisia,Callerya,Ceratonia,Clathrotropis,Colophospermum,Copaifera,Delonix,Euchresta,Guibourtia,Legumes,Machaerium,Pithecolobium,Stryphnodendron,Leguminosae,Pea Family,Pithecellobium,Tachigalia,Families, Pea,Family, Pea,Legume,Pea Families
D001426 Bacterial Proteins Proteins found in any species of bacterium. Bacterial Gene Products,Bacterial Gene Proteins,Gene Products, Bacterial,Bacterial Gene Product,Bacterial Gene Protein,Bacterial Protein,Gene Product, Bacterial,Gene Protein, Bacterial,Gene Proteins, Bacterial,Protein, Bacterial,Proteins, Bacterial
D013559 Symbiosis The relationship between two different species of organisms that are interdependent; each gains benefits from the other or a relationship between different species where both of the organisms in question benefit from the presence of the other. Endosymbiosis,Commensalism,Mutualism
D015964 Gene Expression Regulation, Bacterial Any of the processes by which cytoplasmic or intercellular factors influence the differential control of gene action in bacteria. Bacterial Gene Expression Regulation,Regulation of Gene Expression, Bacterial,Regulation, Gene Expression, Bacterial
D016254 Mutagenesis, Insertional Mutagenesis where the mutation is caused by the introduction of foreign DNA sequences into a gene or extragenic sequence. This may occur spontaneously in vivo or be experimentally induced in vivo or in vitro. Proviral DNA insertions into or adjacent to a cellular proto-oncogene can interrupt GENETIC TRANSLATION of the coding sequences or interfere with recognition of regulatory elements and cause unregulated expression of the proto-oncogene resulting in tumor formation. Gene Insertion,Insertion Mutation,Insertional Activation,Insertional Mutagenesis,Linker-Insertion Mutagenesis,Mutagenesis, Cassette,Sequence Insertion,Viral Insertional Mutagenesis,Activation, Insertional,Activations, Insertional,Cassette Mutagenesis,Gene Insertions,Insertion Mutations,Insertion, Gene,Insertion, Sequence,Insertional Activations,Insertional Mutagenesis, Viral,Insertions, Gene,Insertions, Sequence,Linker Insertion Mutagenesis,Mutagenesis, Linker-Insertion,Mutagenesis, Viral Insertional,Mutation, Insertion,Mutations, Insertion,Sequence Insertions
D042163 Rhizobium etli A species of gram-negative bacteria and nitrogen innoculant of PHASEOLUS VULGARIS.

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