Native bacterial endophytes promote host growth in a species-specific manner; phytohormone manipulations do not result in common growth responses.

<h4>Background</h4>All plants in nature harbor a diverse community of endophytic bacteria which can positively affect host plant growth. Changes in plant growth frequently reflect alterations in phytohormone homoeostasis by plant-growth-promoting (PGP) rhizobacteria which can decrease et...

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Autores principales:	Hoang Hoa Long, Dominik D Schmidt, Ian T Baldwin
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2008
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0e1cb3396b534f2390eddcbc66c698e8
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spelling	oai:doaj.org-article:0e1cb3396b534f2390eddcbc66c698e82021-11-25T06:11:36ZNative bacterial endophytes promote host growth in a species-specific manner; phytohormone manipulations do not result in common growth responses.1932-620310.1371/journal.pone.0002702https://doaj.org/article/0e1cb3396b534f2390eddcbc66c698e82008-07-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/18628963/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>All plants in nature harbor a diverse community of endophytic bacteria which can positively affect host plant growth. Changes in plant growth frequently reflect alterations in phytohormone homoeostasis by plant-growth-promoting (PGP) rhizobacteria which can decrease ethylene (ET) levels enzymatically by 1-aminocyclopropane-1-carboxylate (ACC) deaminase or produce indole acetic acid (IAA). Whether these common PGP mechanisms work similarly for different plant species has not been rigorously tested.<h4>Methodology/principal findings</h4>We isolated bacterial endophytes from field-grown Solanum nigrum; characterized PGP traits (ACC deaminase activity, IAA production, phosphate solubilization and seedling colonization); and determined their effects on their host, S. nigrum, as well as on another Solanaceous native plant, Nicotiana attenuata. In S. nigrum, a majority of isolates that promoted root growth were associated with ACC deaminase activity and IAA production. However, in N. attenuata, IAA but not ACC deaminase activity was associated with root growth. Inoculating N. attenuata and S. nigrum with known PGP bacteria from a culture collection (DSMZ) reinforced the conclusion that the PGP effects are not highly conserved.<h4>Conclusions/significance</h4>We conclude that natural endophytic bacteria with PGP traits do not have general and predictable effects on the growth and fitness of all host plants, although the underlying mechanisms are conserved.Hoang Hoa LongDominik D SchmidtIan T BaldwinPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 3, Iss 7, p e2702 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hoang Hoa Long Dominik D Schmidt Ian T Baldwin Native bacterial endophytes promote host growth in a species-specific manner; phytohormone manipulations do not result in common growth responses.
description	<h4>Background</h4>All plants in nature harbor a diverse community of endophytic bacteria which can positively affect host plant growth. Changes in plant growth frequently reflect alterations in phytohormone homoeostasis by plant-growth-promoting (PGP) rhizobacteria which can decrease ethylene (ET) levels enzymatically by 1-aminocyclopropane-1-carboxylate (ACC) deaminase or produce indole acetic acid (IAA). Whether these common PGP mechanisms work similarly for different plant species has not been rigorously tested.<h4>Methodology/principal findings</h4>We isolated bacterial endophytes from field-grown Solanum nigrum; characterized PGP traits (ACC deaminase activity, IAA production, phosphate solubilization and seedling colonization); and determined their effects on their host, S. nigrum, as well as on another Solanaceous native plant, Nicotiana attenuata. In S. nigrum, a majority of isolates that promoted root growth were associated with ACC deaminase activity and IAA production. However, in N. attenuata, IAA but not ACC deaminase activity was associated with root growth. Inoculating N. attenuata and S. nigrum with known PGP bacteria from a culture collection (DSMZ) reinforced the conclusion that the PGP effects are not highly conserved.<h4>Conclusions/significance</h4>We conclude that natural endophytic bacteria with PGP traits do not have general and predictable effects on the growth and fitness of all host plants, although the underlying mechanisms are conserved.
format	article
author	Hoang Hoa Long Dominik D Schmidt Ian T Baldwin
author_facet	Hoang Hoa Long Dominik D Schmidt Ian T Baldwin
author_sort	Hoang Hoa Long
title	Native bacterial endophytes promote host growth in a species-specific manner; phytohormone manipulations do not result in common growth responses.
title_short	Native bacterial endophytes promote host growth in a species-specific manner; phytohormone manipulations do not result in common growth responses.
title_full	Native bacterial endophytes promote host growth in a species-specific manner; phytohormone manipulations do not result in common growth responses.
title_fullStr	Native bacterial endophytes promote host growth in a species-specific manner; phytohormone manipulations do not result in common growth responses.
title_full_unstemmed	Native bacterial endophytes promote host growth in a species-specific manner; phytohormone manipulations do not result in common growth responses.
title_sort	native bacterial endophytes promote host growth in a species-specific manner; phytohormone manipulations do not result in common growth responses.
publisher	Public Library of Science (PLoS)
publishDate	2008
url	https://doaj.org/article/0e1cb3396b534f2390eddcbc66c698e8
work_keys_str_mv	AT hoanghoalong nativebacterialendophytespromotehostgrowthinaspeciesspecificmannerphytohormonemanipulationsdonotresultincommongrowthresponses AT dominikdschmidt nativebacterialendophytespromotehostgrowthinaspeciesspecificmannerphytohormonemanipulationsdonotresultincommongrowthresponses AT iantbaldwin nativebacterialendophytespromotehostgrowthinaspeciesspecificmannerphytohormonemanipulationsdonotresultincommongrowthresponses
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Native bacterial endophytes promote host growth in a species-specific manner; phytohormone manipulations do not result in common growth responses.

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