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PMID: 17990959 Published · ppublish English Journal Article Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S.

Salicylic acid and jasmonic acid signaling defense pathways reduce natural bacterial diversity on Arabidopsis thaliana.

Molecular plant-microbe interactions : MPMI ·Vol. 20 ·No. 12 ·2007-12-00 ·Pages 1512-22

Kniskern JM, Traw MB, Bergelson J

Abstract

Terrestrial plants serve as large and diverse habitats for a wide range of pathogenic and nonpathogenic microbes, yet these communities are not well described and little is known about the effects of plant defense on microbial communities in nature. We designed a field experiment to determine how variation in two plant defense signaling pathways affects the size, diversity, and composition of the natural endophytic and epiphytic bacterial communities of Arabidopsis thaliana. To do this, we provide an initial characterization of these bacterial communities in one population in southwestern Michigan, United States, and we compare these two communities among A. thaliana mutants deficient in salicylic acid (SA) and jasmonic acid (JA) signaling defense pathways, controls, and plants with artificially elevated levels of defense. We identified 30 distinct bacterial groups on A. thaliana that differ in colony morphology and 16S rRNA sequence. We show that induction of SA-mediated defenses reduced endophytic bacterial community diversity, whereas plants deficient in JA-mediated defenses experienced greater epiphytic bacterial diversity. Furthermore, there was a positive relationship between total community size and diversity, indicating that relatively susceptible plants should, in general, harbor higher bacterial diversity. This experiment provides novel information about the ecology of bacteria on A. thaliana and demonstrates that variation in two specific plant-signaling defense pathways can influence bacterial diversity on plants.

MeSH Terms

Arabidopsis/genetics,metabolism,microbiology Bacteria/classification,genetics,growth & development Biodiversity Colony Count, Microbial Cyclopentanes/metabolism Molecular Sequence Data Mutation Oxylipins/metabolism Phenotype RNA, Ribosomal/chemistry Salicylic Acid/metabolism Signal Transduction

Chemicals

Cyclopentanes Oxylipins RNA, Ribosomal jasmonic acid Salicylic Acid

Authors & Affiliations

3 authors, click to expand affiliations / ORCID

Kniskern Joel M

Department of Ecology and Evolution, University of Chicago, 60637, USA.

Traw M Brian

Bergelson Joy

Article Info

Journal

Molecular plant-microbe interactions : MPMI

Abbr.

Mol Plant Microbe Interact

ISSN

0894-0282

DOI

10.1094/MPMI-20-12-1512

Published

2007-12-00

Pages

1512-22

Language

English

Region

United States

NLM ID

9107902

Subset

Grants

NIGMS NIH HHS · R01 GM057994 · United States

Databases

GENBANK

EF154087, EF154088, EF154089, EF154090, EF154091, EF154092, EF154093, EF154094, EF154095, EF154096, EF154097, EF154098, EF154099, EF154100, EF154101, EF154102, EF154103, EF154104, EF154105, EF154106, EF154107, EF154108, EF154109, EF154110, EF154111, EF154112, EF154113, EF154114, EF154115, EF154116, EF154117, EF154118, EF154119, EF154120, EF154121, EF154122, EF154123, EF154124, EF154125, EF154126, EF154127, EF154128, EF154129, EF154130, EF154131, EF154132, EF154133, EF154134, EF154135, EF154136, EF154137, EF154138, EF154139, EF154140, EF154141, EF154142, EF154143, EF154144, EF154145, EF154146, EF154147, EF154148, EF154149, EF154150, EF154151, EF154152, EF154153, EF154154, EF154155, EF154156, EF154157, EF154158, EF154159, EF154160, EF154161, EF154162, EF154163, EF154164, EF154165, EF154166, EF154167, EF154168, EF154169, EF154170, EF154171, EF154172, EF154173, EF154174, EF154175, EF154176, EF154177, EF154178, EF154179, EF154180, EF154181, EF154182, EF154183, EF154184, EF154185, EF154186, EF154187, EF154188, EF154189

External Links

PubMed source DOI: 10.1094/MPMI-20-12-1512 View journal details

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Salicylic acid and jasmonic acid signaling defense pathways reduce natural bacterial diversity on Arabidopsis thaliana.

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