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Effects of Plant Growth Promoting Rhizobacteria on the Content of Abscisic Acid and Salt Resistance of Wheat Plants

Although salinity inhibits plant growth, application of appropriate rhizosphere bacteria can diminish this negative effect. We studied one possible mechanism that may underlie this beneficial response. Wheat plants were inoculated with Bacillus subtilis IB-22 and Pseudomonas mandelii IB-Ki14 and the...

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Autores principales: Arkhipova, Tatiana, Martynenko, Elena, Sharipova, Guzel, Kuzmina, Ludmila, Ivanov, Igor, Garipova, Margarita, Kudoyarova, Guzel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7690891/
https://www.ncbi.nlm.nih.gov/pubmed/33114358
http://dx.doi.org/10.3390/plants9111429
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author Arkhipova, Tatiana
Martynenko, Elena
Sharipova, Guzel
Kuzmina, Ludmila
Ivanov, Igor
Garipova, Margarita
Kudoyarova, Guzel
author_facet Arkhipova, Tatiana
Martynenko, Elena
Sharipova, Guzel
Kuzmina, Ludmila
Ivanov, Igor
Garipova, Margarita
Kudoyarova, Guzel
author_sort Arkhipova, Tatiana
collection PubMed
description Although salinity inhibits plant growth, application of appropriate rhizosphere bacteria can diminish this negative effect. We studied one possible mechanism that may underlie this beneficial response. Wheat plants were inoculated with Bacillus subtilis IB-22 and Pseudomonas mandelii IB-Ki14 and their consequences for growth, water relations, and concentrations of the hormone abscisic acid (ABA) were followed in the presence of soil salinity. Salinity alone increased ABA concentration in wheat leaves and roots and this was associated with decreased stomatal conductance, but also with chlorophyll loss. Bacterial treatment raised ABA concentrations in roots, suppressed accumulation of leaf ABA, decreased chlorophyll loss, and promoted leaf area and transpiration. However, water balance was maintained due to increased water uptake by inoculated plants, brought about in part by a larger root system. The effect may be the outcome of ABA action since the hormone is known to maintain root extension in stressed plants. Root ABA concentration was highest in salt-stressed plants inoculated with B. subtilis and this contributed to greater root hydraulic conductivity. We conclude that bacteria can raise salt resistance in wheat by increasing root ABA, resulting in larger root systems that can also possess enhanced hydraulic conductivity thereby supporting better-hydrated leaves.
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spelling pubmed-76908912020-11-27 Effects of Plant Growth Promoting Rhizobacteria on the Content of Abscisic Acid and Salt Resistance of Wheat Plants Arkhipova, Tatiana Martynenko, Elena Sharipova, Guzel Kuzmina, Ludmila Ivanov, Igor Garipova, Margarita Kudoyarova, Guzel Plants (Basel) Article Although salinity inhibits plant growth, application of appropriate rhizosphere bacteria can diminish this negative effect. We studied one possible mechanism that may underlie this beneficial response. Wheat plants were inoculated with Bacillus subtilis IB-22 and Pseudomonas mandelii IB-Ki14 and their consequences for growth, water relations, and concentrations of the hormone abscisic acid (ABA) were followed in the presence of soil salinity. Salinity alone increased ABA concentration in wheat leaves and roots and this was associated with decreased stomatal conductance, but also with chlorophyll loss. Bacterial treatment raised ABA concentrations in roots, suppressed accumulation of leaf ABA, decreased chlorophyll loss, and promoted leaf area and transpiration. However, water balance was maintained due to increased water uptake by inoculated plants, brought about in part by a larger root system. The effect may be the outcome of ABA action since the hormone is known to maintain root extension in stressed plants. Root ABA concentration was highest in salt-stressed plants inoculated with B. subtilis and this contributed to greater root hydraulic conductivity. We conclude that bacteria can raise salt resistance in wheat by increasing root ABA, resulting in larger root systems that can also possess enhanced hydraulic conductivity thereby supporting better-hydrated leaves. MDPI 2020-10-24 /pmc/articles/PMC7690891/ /pubmed/33114358 http://dx.doi.org/10.3390/plants9111429 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Arkhipova, Tatiana
Martynenko, Elena
Sharipova, Guzel
Kuzmina, Ludmila
Ivanov, Igor
Garipova, Margarita
Kudoyarova, Guzel
Effects of Plant Growth Promoting Rhizobacteria on the Content of Abscisic Acid and Salt Resistance of Wheat Plants
title Effects of Plant Growth Promoting Rhizobacteria on the Content of Abscisic Acid and Salt Resistance of Wheat Plants
title_full Effects of Plant Growth Promoting Rhizobacteria on the Content of Abscisic Acid and Salt Resistance of Wheat Plants
title_fullStr Effects of Plant Growth Promoting Rhizobacteria on the Content of Abscisic Acid and Salt Resistance of Wheat Plants
title_full_unstemmed Effects of Plant Growth Promoting Rhizobacteria on the Content of Abscisic Acid and Salt Resistance of Wheat Plants
title_short Effects of Plant Growth Promoting Rhizobacteria on the Content of Abscisic Acid and Salt Resistance of Wheat Plants
title_sort effects of plant growth promoting rhizobacteria on the content of abscisic acid and salt resistance of wheat plants
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7690891/
https://www.ncbi.nlm.nih.gov/pubmed/33114358
http://dx.doi.org/10.3390/plants9111429
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