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Different Rhizospheric pH Conditions Affect Nutrient Accumulations in Rice under Salinity Stress

This study was conducted to determine the responses to saline-alkaline (SA) stress with regard to nutrient accumulation in two rice varieties having different tolerances to salt-stress. A salinity-tolerant landrace, Pokkali, and a salinity-sensitive variety, PTT1, were exposed to three levels of SA...

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Autores principales: Nampei, Mami, Jiadkong, Kamonthip, Chuamnakthong, Sumana, Wangsawang, Thanakorn, Sreewongchai, Tanee, Ueda, Akihiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8309205/
https://www.ncbi.nlm.nih.gov/pubmed/34202279
http://dx.doi.org/10.3390/plants10071295
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author Nampei, Mami
Jiadkong, Kamonthip
Chuamnakthong, Sumana
Wangsawang, Thanakorn
Sreewongchai, Tanee
Ueda, Akihiro
author_facet Nampei, Mami
Jiadkong, Kamonthip
Chuamnakthong, Sumana
Wangsawang, Thanakorn
Sreewongchai, Tanee
Ueda, Akihiro
author_sort Nampei, Mami
collection PubMed
description This study was conducted to determine the responses to saline-alkaline (SA) stress with regard to nutrient accumulation in two rice varieties having different tolerances to salt-stress. A salinity-tolerant landrace, Pokkali, and a salinity-sensitive variety, PTT1, were exposed to three levels of SA conditions, pH 7.0 (mild), pH 8.0 (moderate), and pH 9.0 (severe), under 50 mM Na stress. The results indicated that Pokkali had comparably greater SA tolerance than PTT1 owing to its higher biomass production. The maintenance of the lower Na/K ratio in Pokkali shoots was achieved by the higher expression of OsHKT1;5 encoding a Na(+) transporter in the shoots, OsNHX1 encoding a tonoplast-localized Na(+)/H(+) antiporter in the roots, and OsHAK16 encoding a K(+) transporter in the roots under SA conditions. We propose that the high expression of Fe deficiency-responsive genes, OsIRT1, OsIRO2, OsYSL15, OsNAS1, and OsNAS2, in both rice varieties under all SA conditions should contribute to Fe homeostasis in the shoots. In addition, SA treatment increased the concentrations of Ca, Mn, Zn, and Cu in the roots but decreased their concentrations in the shoots of both varieties. Overall, the results indicated that high rhizospheric pH influenced nutrient uptake and translocation from the roots to the shoots in rice.
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spelling pubmed-83092052021-07-25 Different Rhizospheric pH Conditions Affect Nutrient Accumulations in Rice under Salinity Stress Nampei, Mami Jiadkong, Kamonthip Chuamnakthong, Sumana Wangsawang, Thanakorn Sreewongchai, Tanee Ueda, Akihiro Plants (Basel) Article This study was conducted to determine the responses to saline-alkaline (SA) stress with regard to nutrient accumulation in two rice varieties having different tolerances to salt-stress. A salinity-tolerant landrace, Pokkali, and a salinity-sensitive variety, PTT1, were exposed to three levels of SA conditions, pH 7.0 (mild), pH 8.0 (moderate), and pH 9.0 (severe), under 50 mM Na stress. The results indicated that Pokkali had comparably greater SA tolerance than PTT1 owing to its higher biomass production. The maintenance of the lower Na/K ratio in Pokkali shoots was achieved by the higher expression of OsHKT1;5 encoding a Na(+) transporter in the shoots, OsNHX1 encoding a tonoplast-localized Na(+)/H(+) antiporter in the roots, and OsHAK16 encoding a K(+) transporter in the roots under SA conditions. We propose that the high expression of Fe deficiency-responsive genes, OsIRT1, OsIRO2, OsYSL15, OsNAS1, and OsNAS2, in both rice varieties under all SA conditions should contribute to Fe homeostasis in the shoots. In addition, SA treatment increased the concentrations of Ca, Mn, Zn, and Cu in the roots but decreased their concentrations in the shoots of both varieties. Overall, the results indicated that high rhizospheric pH influenced nutrient uptake and translocation from the roots to the shoots in rice. MDPI 2021-06-25 /pmc/articles/PMC8309205/ /pubmed/34202279 http://dx.doi.org/10.3390/plants10071295 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Nampei, Mami
Jiadkong, Kamonthip
Chuamnakthong, Sumana
Wangsawang, Thanakorn
Sreewongchai, Tanee
Ueda, Akihiro
Different Rhizospheric pH Conditions Affect Nutrient Accumulations in Rice under Salinity Stress
title Different Rhizospheric pH Conditions Affect Nutrient Accumulations in Rice under Salinity Stress
title_full Different Rhizospheric pH Conditions Affect Nutrient Accumulations in Rice under Salinity Stress
title_fullStr Different Rhizospheric pH Conditions Affect Nutrient Accumulations in Rice under Salinity Stress
title_full_unstemmed Different Rhizospheric pH Conditions Affect Nutrient Accumulations in Rice under Salinity Stress
title_short Different Rhizospheric pH Conditions Affect Nutrient Accumulations in Rice under Salinity Stress
title_sort different rhizospheric ph conditions affect nutrient accumulations in rice under salinity stress
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8309205/
https://www.ncbi.nlm.nih.gov/pubmed/34202279
http://dx.doi.org/10.3390/plants10071295
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