Introduction of a novel pathway for IAA biosynthesis to rhizobia alters vetch root nodule development

Serena Camerini; Beatrice Senatore; Enza Lonardo; Esther Imperlini; Carmen Bianco; Giancarlo Moschetti; Giuseppe L. Rotino; Bruno Campion; Roberto Defez

doi:10.1007/s00203-008-0365-7

Introduction of a novel pathway for IAA biosynthesis to rhizobia alters vetch root nodule development

Serena Camerini, Beatrice Senatore, Enza Lonardo, Esther Imperlini, Carmen Bianco, Giancarlo Moschetti, Giuseppe L. Rotino, Bruno Campion, Roberto Defez

IRCCS SDN

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Abstract

We introduced into Rhizobium leguminosarum bv. viciae LPR1105 a new pathway for the biosynthesis of the auxin, indole-3-acetic acid (IAA), under the control of a stationary phase-activated promoter active both in free-living bacteria and bacteroids. The newly introduced genes are the iaaM gene from Pseudomonas savastanoi and the tms2 gene from Agrobacterium tumefaciens. Free-living bacteria harbouring the promoter-iaaMtms2 construct release into the growth medium 14-fold more IAA than the wild-type parental strain. This IAA overproducing R. l. viciae, the RD20 strain, elicits the development of vetch root nodules containing up to 60-fold more IAA than nodules infected by the wild-type strain LPR1105. Vetch root nodules derived from RD20 are fewer in number per plant, heavier in terms of dry weight and show an enlarged and more active meristem. A significant increase in acetylene reduction activity was measured in nodules elicited in vetch by RD20.

Original language	English
Pages (from-to)	67-77
Number of pages	11
Journal	Archives of Microbiology
Volume	190
Issue number	1
DOIs	https://doi.org/10.1007/s00203-008-0365-7
Publication status	Published - Jul 2008

Keywords

ARA
Auxin
IAA
Nitrogen fixation
Nodule zone
Vicia hirsuta

ASJC Scopus subject areas

Microbiology

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Introduction of a novel pathway for IAA biosynthesis to rhizobia alters vetch root nodule development. / Camerini, Serena; Senatore, Beatrice; Lonardo, Enza; Imperlini, Esther; Bianco, Carmen; Moschetti, Giancarlo; Rotino, Giuseppe L.; Campion, Bruno; Defez, Roberto.

In: Archives of Microbiology, Vol. 190, No. 1, 07.2008, p. 67-77.

Research output: Contribution to journal › Article › peer-review

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abstract = "We introduced into Rhizobium leguminosarum bv. viciae LPR1105 a new pathway for the biosynthesis of the auxin, indole-3-acetic acid (IAA), under the control of a stationary phase-activated promoter active both in free-living bacteria and bacteroids. The newly introduced genes are the iaaM gene from Pseudomonas savastanoi and the tms2 gene from Agrobacterium tumefaciens. Free-living bacteria harbouring the promoter-iaaMtms2 construct release into the growth medium 14-fold more IAA than the wild-type parental strain. This IAA overproducing R. l. viciae, the RD20 strain, elicits the development of vetch root nodules containing up to 60-fold more IAA than nodules infected by the wild-type strain LPR1105. Vetch root nodules derived from RD20 are fewer in number per plant, heavier in terms of dry weight and show an enlarged and more active meristem. A significant increase in acetylene reduction activity was measured in nodules elicited in vetch by RD20.",

keywords = "ARA, Auxin, IAA, Nitrogen fixation, Nodule zone, Vicia hirsuta",

author = "Serena Camerini and Beatrice Senatore and Enza Lonardo and Esther Imperlini and Carmen Bianco and Giancarlo Moschetti and Rotino, {Giuseppe L.} and Bruno Campion and Roberto Defez",

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AU - Camerini, Serena

AU - Senatore, Beatrice

AU - Lonardo, Enza

AU - Imperlini, Esther

AU - Bianco, Carmen

AU - Moschetti, Giancarlo

AU - Rotino, Giuseppe L.

AU - Campion, Bruno

AU - Defez, Roberto

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KW - Nodule zone

KW - Vicia hirsuta

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Introduction of a novel pathway for IAA biosynthesis to rhizobia alters vetch root nodule development

Abstract

Keywords

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