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

Nampei, Mami; Jiadkong, Kamonthip; Chuamnakthong, Sumana; Wangsawang, Thanakorn; Sreewongchai, Tanee; Ueda, Akihiro

doi:10.3390/plants10071295

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

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Graduate School of Integrated Sciences for Life, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan

Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan

Faculty of Agricultural Technology, Valaya Alongkorn Rajabhat University under the Royal Patronage, 1 Moo 20, Phaholyothin Road, Klong Neung, Klong Luang, Pathum Thani 13180, Thailand

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Department of Agronomy, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand

Author to whom correspondence should be addressed.

Academic Editors: Ewa Hanus-Fajerska and Iwona Kamińska

Plants 2021, 10(7), 1295; https://doi.org/10.3390/plants10071295

Received: 9 May 2021 / Revised: 17 June 2021 / Accepted: 22 June 2021 / Published: 25 June 2021

(This article belongs to the Special Issue Plants Subjected to Salinity Stress)

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Abstract

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. View Full-Text

Keywords: Na exclusion; nutrients accumulation; rice saline-alkaline tolerance

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Nampei, M.; Jiadkong, K.; Chuamnakthong, S.; Wangsawang, T.; Sreewongchai, T.; Ueda, A. Different Rhizospheric pH Conditions Affect Nutrient Accumulations in Rice under Salinity Stress. Plants 2021, 10, 1295. https://doi.org/10.3390/plants10071295

AMA Style

Nampei M, Jiadkong K, Chuamnakthong S, Wangsawang T, Sreewongchai T, Ueda A. Different Rhizospheric pH Conditions Affect Nutrient Accumulations in Rice under Salinity Stress. Plants. 2021; 10(7):1295. https://doi.org/10.3390/plants10071295

Chicago/Turabian Style

Nampei, Mami, Kamonthip Jiadkong, Sumana Chuamnakthong, Thanakorn Wangsawang, Tanee Sreewongchai, and Akihiro Ueda. 2021. "Different Rhizospheric pH Conditions Affect Nutrient Accumulations in Rice under Salinity Stress" Plants 10, no. 7: 1295. https://doi.org/10.3390/plants10071295

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

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