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Author (up) Kraiser, T.; Gras, D.E.; Gutierrez, A.G.; Gonzalez, B.; Gutierrez, R.A. pdf  doi
openurl 
  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 (up) Kraiser, T.; Stuardo, M.; Manzano, M.; Ledger, T.; Gonzalez, B. pdf  doi
openurl 
  Title Simultaneous assessment of the effects of an herbicide on the triad: rhizobacterial community, an herbicide degrading soil bacterium and their plant host Type
  Year 2013 Publication Plant And Soil Abbreviated Journal Plant Soil  
  Volume 366 Issue 1-2 Pages 377-388  
  Keywords 2,4-D herbicide; Acacia caven; Bioremediation; Cupriavidus pinatubonensis JMP134; Plant soil microcosms; Rhizosphere  
  Abstract This work addresses the relevant effects that one single compound, used as model herbicide, provokes on the activity/survival of a suitable herbicide degrading model bacterium and on a plant that hosts this bacterium and its bacterial rhizospheric community. The effects of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D), on Acacia caven hosting the 2,4-D degrading bacterium Cupriavidus pinatubonensis JMP134, and its rhizospheric microbiota, were simultaneously addressed in plant soil microcosms, and followed by culture dependent and independent procedures, herbicide removal tests, bioprotection assays and use of encapsulated bacterial cells. The herbicide provokes deleterious effects on the plant, which are significantly diminished by the presence of the plant associated C. pinatubonensis, especially with encapsulated cells. This improvement correlated with increased 2,4-D degradation rates. The herbicide significantly changes the structure of the A. caven bacterial rhizospheric community; and it also diminishes the preference of C. pinatubonensis for the A. caven rhizosphere compared with the surrounding bulk soil. The addition of an herbicide to soil triggers a complex, although more or less predictable, suite of effects on rhizobacterial communities, herbicide degrading bacteria and their plant hosts that should be taken into account in fundamental studies and design of bio(phyto)remediation procedures.  
  Address Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago 7941169, Chile, Email: bernardo.gonzalez@uai.cl  
  Corporate Author Thesis  
  Publisher Springer Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0032-079x ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000317988600027 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 278  
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Author (up) Ledger, T.; Zuniga, A.; Kraiser, T.; Dasencich, P.; Donoso, R.; Perez-Pantoja, D.; Gonzalez, B. pdf  doi
openurl 
  Title Aromatic compounds degradation plays a role in colonization of Arabidopsis thaliana and Acacia caven by Cupriavidus pinatubonensis JMP134 Type
  Year 2012 Publication Antonie Van Leeuwenhoek International Journal Of General And Molecular Microbiology Abbreviated Journal Antonie Van Leeuwenhoek  
  Volume 101 Issue 4 Pages 713-723  
  Keywords Acacia caven; Arabidopsis thaliana; Aromatic compounds; Cupriavidus pinatubonensis JMP134; Plant growth; Rhizosphere  
  Abstract Plant rhizosphere and internal tissues may constitute a relevant habitat for soil bacteria displaying high catabolic versatility towards xenobiotic aromatic compounds. Root exudates contain various molecules that are structurally related to aromatic xenobiotics and have been shown to stimulate bacterial degradation of aromatic pollutants in the rhizosphere. The ability to degrade specific aromatic components of root exudates could thus provide versatile catabolic bacteria with an advantage for rhizosphere colonization and growth. In this work, Cupriavidus pinatubonensis JMP134, a well-known aromatic compound degrader (including the herbicide 2,4-dichlorophenoxyacetate, 2,4-D), was shown to stably colonize Arabidopsis thaliana and Acacia caven plants both at the rhizoplane and endorhizosphere levels and to use root exudates as a sole carbon and energy source. No deleterious effects were detected on these colonized plants. When a toxic concentration of 2,4-D was applied to colonized A. caven, a marked resistance was induced in the plant, showing that strain JMP134 was both metabolically active and potentially beneficial to its host. The role for the beta-ketoadipate aromatic degradation pathway during plant root colonization by C. pinatubonensis JMP134 was investigated by gene inactivation. A C. pinatubonensis mutant derivative strain displayed a reduced ability to catabolise root exudates isolated from either plant host. In this mutant strain, a lower competence in the rhizosphere of A. caven was also shown, both in gnotobiotic in vitro cultures and in plant/soil microcosms.  
  Address [Ledger, Thomas; Zuniga, Ana; Dasencich, Paola; Donoso, Raul; Gonzalez, Bernardo] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago 7941169, Chile, Email: bernardo.gonzalez@uai.cl  
  Corporate Author Thesis  
  Publisher Springer Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0003-6072 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000303402400003 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 214  
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