Plant growth-promoting rhizobacteria able to improve NPK availability: selection, identification and effects on tomato growth

ABSTRACT Nitrogen, P and K are essential macronutrients that are not readily available to plants. Rhizobacteria are able to convert these unavailable forms for subsequent uptake by the plant, diverse species have been characterized as N2 fixers, P solubilizers and capable to solubilize mineral K fro...

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Autores principales:	Reyes-Castillo,Altagracia, Gerding,Macarena, Oyarzúa,Pía, Zagal,Erick, Gerding,Javiera, Fischer,Susana
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2019
Materias:	Acinetobacter N2 fixation phosphorus and potassium solubilization Pseudomonas Rahnella Solanum lycopersicum
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392019000300473
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spelling	oai:scielo:S0718-583920190003004732019-07-18Plant growth-promoting rhizobacteria able to improve NPK availability: selection, identification and effects on tomato growthReyes-Castillo,AltagraciaGerding,MacarenaOyarzúa,PíaZagal,ErickGerding,JavieraFischer,Susana Acinetobacter N2 fixation phosphorus and potassium solubilization Pseudomonas Rahnella Solanum lycopersicum ABSTRACT Nitrogen, P and K are essential macronutrients that are not readily available to plants. Rhizobacteria are able to convert these unavailable forms for subsequent uptake by the plant, diverse species have been characterized as N2 fixers, P solubilizers and capable to solubilize mineral K from unavailable forms. The objective of this study was to select rhizobacteria capable of improving NPK availability and promoting tomato (Solanum lycopersicum L.) growth. Fifteen strains were studied. Four strains were selected for their capacity to fix N2, three for their ability to solubilize P, and six for their capacity to solubilize biotite and K-feldspar, isolated from tomato, lentil, chili pepper, faba bean and lettuce crops in Andisol and Alfisol soils. Through 16SrRNA sequencing, selected strains were identified as Pseudomonas gessardi, P. koreensis, P. brassicacearum, P. marginalis, Acinetobacter calcoaceticus and Rahnella aquatica. Phosphorus solubilizing strains did not show a positive effect on plant growth or an increase in available soil P. The N2 fixing bacteria Tmt-16 strain increased root growth in 23.57%; maintained the highest N content in plant tissue, 2.60%, higher amount of N available in the soil, 2.95 mg kg-1, and a higher content of N-NH4 + 1.95 mg kg-1. The K solubilizing strains Ls-C21, Ltj-62 and LsC-58 reached 17.0 to 19.0 mg kg-1 available K and 0.04 to 0.05 mg kg-1 exchangeable K (p ≤ 0.05.). These four endemic rhizobacteria can be potentially used as biofertilizers, allowing a reduction in the use of chemical fertilizers and a more sustainable production of tomatoesinfo:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.79 n.3 20192019-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392019000300473en10.4067/S0718-58392019000300473
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Acinetobacter N2 fixation phosphorus and potassium solubilization Pseudomonas Rahnella Solanum lycopersicum
spellingShingle	Acinetobacter N2 fixation phosphorus and potassium solubilization Pseudomonas Rahnella Solanum lycopersicum Reyes-Castillo,Altagracia Gerding,Macarena Oyarzúa,Pía Zagal,Erick Gerding,Javiera Fischer,Susana Plant growth-promoting rhizobacteria able to improve NPK availability: selection, identification and effects on tomato growth
description	ABSTRACT Nitrogen, P and K are essential macronutrients that are not readily available to plants. Rhizobacteria are able to convert these unavailable forms for subsequent uptake by the plant, diverse species have been characterized as N2 fixers, P solubilizers and capable to solubilize mineral K from unavailable forms. The objective of this study was to select rhizobacteria capable of improving NPK availability and promoting tomato (Solanum lycopersicum L.) growth. Fifteen strains were studied. Four strains were selected for their capacity to fix N2, three for their ability to solubilize P, and six for their capacity to solubilize biotite and K-feldspar, isolated from tomato, lentil, chili pepper, faba bean and lettuce crops in Andisol and Alfisol soils. Through 16SrRNA sequencing, selected strains were identified as Pseudomonas gessardi, P. koreensis, P. brassicacearum, P. marginalis, Acinetobacter calcoaceticus and Rahnella aquatica. Phosphorus solubilizing strains did not show a positive effect on plant growth or an increase in available soil P. The N2 fixing bacteria Tmt-16 strain increased root growth in 23.57%; maintained the highest N content in plant tissue, 2.60%, higher amount of N available in the soil, 2.95 mg kg-1, and a higher content of N-NH4 + 1.95 mg kg-1. The K solubilizing strains Ls-C21, Ltj-62 and LsC-58 reached 17.0 to 19.0 mg kg-1 available K and 0.04 to 0.05 mg kg-1 exchangeable K (p ≤ 0.05.). These four endemic rhizobacteria can be potentially used as biofertilizers, allowing a reduction in the use of chemical fertilizers and a more sustainable production of tomatoes
author	Reyes-Castillo,Altagracia Gerding,Macarena Oyarzúa,Pía Zagal,Erick Gerding,Javiera Fischer,Susana
author_facet	Reyes-Castillo,Altagracia Gerding,Macarena Oyarzúa,Pía Zagal,Erick Gerding,Javiera Fischer,Susana
author_sort	Reyes-Castillo,Altagracia
title	Plant growth-promoting rhizobacteria able to improve NPK availability: selection, identification and effects on tomato growth
title_short	Plant growth-promoting rhizobacteria able to improve NPK availability: selection, identification and effects on tomato growth
title_full	Plant growth-promoting rhizobacteria able to improve NPK availability: selection, identification and effects on tomato growth
title_fullStr	Plant growth-promoting rhizobacteria able to improve NPK availability: selection, identification and effects on tomato growth
title_full_unstemmed	Plant growth-promoting rhizobacteria able to improve NPK availability: selection, identification and effects on tomato growth
title_sort	plant growth-promoting rhizobacteria able to improve npk availability: selection, identification and effects on tomato growth
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2019
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392019000300473
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Plant growth-promoting rhizobacteria able to improve NPK availability: selection, identification and effects on tomato growth

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