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Role of Rhizosphere Bacteria and Root Exudates on the Assimilation of Phosphorus = = Rol De Las Bacterias De La Rizosfera y los Exudados De Las Raices en La Asimilacion Del Fosforo.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Role of Rhizosphere Bacteria and Root Exudates on the Assimilation of Phosphorus =/
Reminder of title:	Rol De Las Bacterias De La Rizosfera y los Exudados De Las Raices en La Asimilacion Del Fosforo.
remainder title:	Rol De Las Bacterias De La Rizosfera y los Exudados De Las Raices en La Asimilacion Del Fosforo.
Author:	Pantigoso Guevara, Hugo A.
Description:	1 online resource (128 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 83-12, Section: B.
Contained By:	Dissertations Abstracts International83-12B.
Subject:	Agriculture. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28965273click for full text (PQDT)
ISBN:	9798438780366

Role of Rhizosphere Bacteria and Root Exudates on the Assimilation of Phosphorus = = Rol De Las Bacterias De La Rizosfera y los Exudados De Las Raices en La Asimilacion Del Fosforo.
Pantigoso Guevara, Hugo A.

Role of Rhizosphere Bacteria and Root Exudates on the Assimilation of Phosphorus =Rol De Las Bacterias De La Rizosfera y los Exudados De Las Raices en La Asimilacion Del Fosforo.Rol De Las Bacterias De La Rizosfera y los Exudados De Las Raices en La Asimilacion Del Fosforo. - 1 online resource (128 pages)

Source: Dissertations Abstracts International, Volume: 83-12, Section: B.

Thesis (Ph.D.)--Colorado State University, 2022.

Includes bibliographical references

Deficient phosphorus (P) bioavailability in soils is a major challenge for sustainable food production as effective strategies to access unavailable P are limited. Solubilizing-bacteria and root exudate metabolites that solubilize P are promising approaches to increase available P for plants. We hypothesized that compounds in root exudates could elicit the P-solubilization activity of bacteria. To test this hypothesis, the root exudates of Arabidopsis grown in vitro under sufficient and deficient P conditions were characterized using GC-MS. We tested the ability of previously screened root exudates to solubilize plant-unavailable P in vitro. In parallel, potential P-solubilizing bacteria were isolated from the rhizosphere of wild potatoes using conventional microbiology techniques. The bacteria strains were tested, both individually and in consortia, for their ability to solubilize organic (phytin) and inorganic (calcium) P sources in vitro and in planta. Lastly, selected root exudate compounds were incubated together with P-solubilizing bacteria, and bacterial growth, P solubilization activity, and plant growth were evaluated. Our results demonstrate that malic, nicotinic, and 3-hydroxypropionic acids improved solubilization of P as compared to a control. Likewise, the bacterial strains E. cloacae, P. pseudoalcaligenes, and B. thuringiensis enhanced plant growth and P content with additions of plant-unavailable P. Furthermore, we found that threonine and 4-hydroxybutyric acid elicit P solubilization in all bacteria, under both organic and inorganic sources, independent of bacterial growth. Subsequent exogenous application of threonine to soils improved plant root growth, enhanced nitrogen and phosphorus content in roots and increased available levels of potassium, calcium, and magnesium in soils. Altogether, our findings expand on the function of exuded specialized compounds and suggest approaches to effectively recover residual P from soil, improving crop growth and nutrition.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798438780366Subjects--Topical Terms:

518588
Agriculture.
Subjects--Index Terms:

PhosphorusIndex Terms--Genre/Form:

542853
Electronic books.

Role of Rhizosphere Bacteria and Root Exudates on the Assimilation of Phosphorus = = Rol De Las Bacterias De La Rizosfera y los Exudados De Las Raices en La Asimilacion Del Fosforo.
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502 $a Thesis (Ph.D.)--Colorado State University, 2022.
504 $a Includes bibliographical references
520 $a Deficient phosphorus (P) bioavailability in soils is a major challenge for sustainable food production as effective strategies to access unavailable P are limited. Solubilizing-bacteria and root exudate metabolites that solubilize P are promising approaches to increase available P for plants. We hypothesized that compounds in root exudates could elicit the P-solubilization activity of bacteria. To test this hypothesis, the root exudates of Arabidopsis grown in vitro under sufficient and deficient P conditions were characterized using GC-MS. We tested the ability of previously screened root exudates to solubilize plant-unavailable P in vitro. In parallel, potential P-solubilizing bacteria were isolated from the rhizosphere of wild potatoes using conventional microbiology techniques. The bacteria strains were tested, both individually and in consortia, for their ability to solubilize organic (phytin) and inorganic (calcium) P sources in vitro and in planta. Lastly, selected root exudate compounds were incubated together with P-solubilizing bacteria, and bacterial growth, P solubilization activity, and plant growth were evaluated. Our results demonstrate that malic, nicotinic, and 3-hydroxypropionic acids improved solubilization of P as compared to a control. Likewise, the bacterial strains E. cloacae, P. pseudoalcaligenes, and B. thuringiensis enhanced plant growth and P content with additions of plant-unavailable P. Furthermore, we found that threonine and 4-hydroxybutyric acid elicit P solubilization in all bacteria, under both organic and inorganic sources, independent of bacterial growth. Subsequent exogenous application of threonine to soils improved plant root growth, enhanced nitrogen and phosphorus content in roots and increased available levels of potassium, calcium, and magnesium in soils. Altogether, our findings expand on the function of exuded specialized compounds and suggest approaches to effectively recover residual P from soil, improving crop growth and nutrition.
520 $a La biodisponibilidad deficiente de fosforo (P) en los suelos es un desafio importante para la produccion sostenible de alimentos, ya que las estrategias efectivas para acceder al P no disponible son limitadas. Las bacterias solubilizadoras y los metabolitos del exudado de raices que solubilizan P son enfoques prometedores para aumentar el P disponible para las plantas. Presumimos que los compuestos en los exudados de las raices podrian provocar la actividad de solubilizacion de P de las bacterias. Para probar esta hipotesis, los exudados de raices de Arabidopsis cultivadas in vitro en condiciones de P suficiente y deficiente se caracterizaron mediante GC-MS. Probamos la capacidad de los exudados de raices previamente examinados para solubilizar in vitro el P no disponible para las plantas. Paralelamente, se aislaron bacterias solubilizadoras de fosforo potenciales de la rizosfera de papas silvestres utilizando tecnicas de microbiologia convencional. Las cepas bacterianas se probaron, tanto individualmente como en consorcios, en cuanto a su capacidad para solubilizar fuentes de P organicas (fitina) e inorganicas (calcio) in vitro e in planta. Por ultimo, se incubaron compuestos de exudado de raices seleccionados junto con bacterias solubilizadoras de P y se evaluo el crecimiento bacteriano, la actividad de solubilizacion de P y el crecimiento de las plantas. Nuestros resultados demuestran que los acidos malico, nicotinico y 3-hidroxipropionico mejoraron la solubilizacion de P en comparacion con un control. Del mismo modo, las cepas bacterianas E. cloacae, P. pseudoalcaligenes y B. thuringiensis mejoraron el crecimiento de las plantas y el contenido de P con adiciones de P no disponible para las plantas. Ademas, encontramos que la treonina y el acido 4-hidroxibutirico provocan la solubilizacion de P en todas las bacterias, bajo fuentes tanto organicas como inorganicas, independientemente del crecimiento bacteriano. La aplicacion exogena posterior de treonina a los suelos mejoro el crecimiento de las raices de las plantas, mejoro el contenido de nitrogeno y fosforo en las raices y aumento los niveles disponibles de potasio, calcio y magnesio en los suelos. En conjunto, nuestros hallazgos amplian la funcion de los compuestos especializados exudados y sugieren enfoques para recuperar de manera efectiva el P residual del suelo, mejorando el crecimiento y la nutricion de los cultivos.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Agriculture. $3 518588
650 4 $a Biology. $3 522710
650 4 $a Horticulture. $3 555447
650 4 $a Soil sciences. $3 2122699
650 4 $a Molecular biology. $3 517296
650 4 $a Biochemistry. $3 518028
653 $a Phosphorus
653 $a Plant
653 $a Rhizobacteria
653 $a Rhizosphere
653 $a Root exudates
653 $a Soil
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710 2 $a Colorado State University. $b Horticulture & Landscape Architecture. $3 3563791
773 0 $t Dissertations Abstracts International $g 83-12B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28965273 $z click for full text (PQDT)