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Author Kraiser, T.; Gras, D.E.; Gutierrez, A.G.; Gonzalez, B.; Gutierrez, R.A.
Title A holistic view of nitrogen acquisition in plants Type
Year 2011 Publication Journal Of Experimental Botany Abbreviated Journal J. Exp. Bot.
Volume 62 Issue 4 Pages 1455-1466
Keywords Bacteria; nitrogen; nitrogen acquisition; plants
Abstract Nitrogen (N) is the mineral nutrient required in the greatest amount and its availability is a major factor limiting growth and development of plants. As sessile organisms, plants have evolved different strategies to adapt to changes in the availability and distribution of N in soils. These strategies include mechanisms that act at different levels of biological organization from the molecular to the ecosystem level. At the molecular level, plants can adjust their capacity to acquire different forms of N in a range of concentrations by modulating the expression and function of genes in different N uptake systems. Modulation of plant growth and development, most notably changes in the root system architecture, can also greatly impact plant N acquisition in the soil. At the organism and ecosystem levels, plants establish associations with diverse microorganisms to ensure adequate nutrition and N supply. These different adaptive mechanisms have been traditionally discussed separately in the literature. To understand plant N nutrition in the environment, an integrated view of all pathways contributing to plant N acquisition is required. Towards this goal, in this review the different mechanisms that plants utilize to maintain an adequate N supply are summarized and integrated.
Address [Kraiser, Tatiana; Gras, Diana E.; Gutierrez, Rodrigo A.] Pontificia Univ Catolica Chile, Dept Mol Genet & Microbiol, Ctr Genome Regulat, Santiago 8331010, Chile, Email: rgutierrez@bio.puc.cl
Corporate Author Thesis
Publisher Oxford Univ Press Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0022-0957 ISBN Medium
Area Expedition Conference
Notes WOS:000286989700010 Approved
Call Number UAI @ eduardo.moreno @ Serial 124
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Author Zuniga, A.; Poupin, M.J.; Donoso, R.; Ledger, T.; Guiliani, N.; Gutierrez, R.A.; Gonzalez, B.
Title Quorum Sensing and Indole-3-Acetic Acid Degradation Play a Role in Colonization and Plant Growth Promotion of Arabidopsis thaliana by Burkholderia phytofirmans PsJN Type
Year 2013 Publication Molecular Plant-Microbe Interactions Abbreviated Journal Mol. Plant-Microbe Interact.
Volume 26 Issue 5 Pages 546-553
Keywords
Abstract Although not fully understood, molecular communication in the rhizosphere plays an important role regulating traits involved in plant-bacteria association. Burkholderia phytofirmans PsJN is a well-known plant-growth-promoting bacterium, which establishes rhizospheric and endophytic colonization in different plants. A competent colonization is essential for plant-growth-promoting effects produced by bacteria. Using appropriate mutant strains of B. phytofirmans, we obtained evidence for the importance of N-acyl homoserine lactone-mediated (quorum sensing) cell-to-cell communication in efficient colonization of Arabidopsis thaliana plants and the establishment of a beneficial interaction. We also observed that bacterial degradation of the auxin indole-3-acetic acid (IAA) plays a key role in plant-growth-promoting traits and is necessary for efficient rhizosphere colonization. Wildtype B. phytofirmans but not the iacC mutant in IAA mineralization is able to restore promotion effects in roots of A. thaliana in the presence of exogenously added IAA, indicating the importance of this trait for promoting primary root length. Using a transgenic A. thaliana line with suppressed auxin signaling (miR393) and analyzing the expression of auxin receptors in wild-type inoculated plants, we provide evidence that auxin signaling in plants is necessary for the growth promotion effects produced by B. phytofirmans. The interplay between ethylene and auxin signaling was also confirmed by the response of the plant to a 1-aminocyclopropane-1-carboxylate deaminase bacterial mutant strain.
Address Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago, Chile, Email: bernardo.gonzalez@uai.cl
Corporate Author Thesis
Publisher Amer Phytopathological Soc Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0894-0282 ISBN Medium
Area Expedition Conference
Notes WOS:000317875400008 Approved
Call Number UAI @ eduardo.moreno @ Serial 277
Permanent link to this record