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Endogenous ABA alleviates rice ammonium toxicity by reducing ROS and free ammonium via regulation of the SAPK9–bZIP20 pathway
Ammonium (NH(4)(+)) is one of the principal nitrogen (N) sources in soils, but is typically toxic already at intermediate concentrations. The phytohormone abscisic acid (ABA) plays a pivotal role in responses to environmental stresses. However, the role of ABA under high-NH(4)(+) stress in rice (Ory...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7475098/ https://www.ncbi.nlm.nih.gov/pubmed/32064504 http://dx.doi.org/10.1093/jxb/eraa076 |
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author | Sun, Li Di, Dong-Wei Li, Guangjie Kronzucker, Herbert J Wu, Xiangyu Shi, Weiming |
author_facet | Sun, Li Di, Dong-Wei Li, Guangjie Kronzucker, Herbert J Wu, Xiangyu Shi, Weiming |
author_sort | Sun, Li |
collection | PubMed |
description | Ammonium (NH(4)(+)) is one of the principal nitrogen (N) sources in soils, but is typically toxic already at intermediate concentrations. The phytohormone abscisic acid (ABA) plays a pivotal role in responses to environmental stresses. However, the role of ABA under high-NH(4)(+) stress in rice (Oryza sativa L.) is only marginally understood. Here, we report that elevated NH(4)(+) can significantly accelerate tissue ABA accumulation. Mutants with high (Osaba8ox) and low levels of ABA (Osphs3-1) exhibit elevated tolerance or sensitivity to high-NH(4)(+) stress, respectively. Furthermore, ABA can decrease NH(4)(+)-induced oxidative damage and tissue NH(4)(+) accumulation by enhancing antioxidant and glutamine synthetase (GS)/glutamate synthetasae (GOGAT) enzyme activities. Using RNA sequencing and quantitative real-time PCR approaches, we ascertain that two genes, OsSAPK9 and OsbZIP20, are induced both by high NH(4)(+) and by ABA. Our data indicate that OsSAPK9 interacts with OsbZIP20, and can phosphorylate OsbZIP20 and activate its function. When OsSAPK9 or OsbZIP20 are knocked out in rice, ABA-mediated antioxidant and GS/GOGAT activity enhancement under high-NH(4)(+) stress disappear, and the two mutants are more sensitive to high-NH(4)(+) stress compared with their wild types. Taken together, our results suggest that ABA plays a positive role in regulating the OsSAPK9–OsbZIP20 pathway in rice to increase tolerance to high-NH(4)(+) stress. |
format | Online Article Text |
id | pubmed-7475098 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-74750982020-09-10 Endogenous ABA alleviates rice ammonium toxicity by reducing ROS and free ammonium via regulation of the SAPK9–bZIP20 pathway Sun, Li Di, Dong-Wei Li, Guangjie Kronzucker, Herbert J Wu, Xiangyu Shi, Weiming J Exp Bot Research Papers Ammonium (NH(4)(+)) is one of the principal nitrogen (N) sources in soils, but is typically toxic already at intermediate concentrations. The phytohormone abscisic acid (ABA) plays a pivotal role in responses to environmental stresses. However, the role of ABA under high-NH(4)(+) stress in rice (Oryza sativa L.) is only marginally understood. Here, we report that elevated NH(4)(+) can significantly accelerate tissue ABA accumulation. Mutants with high (Osaba8ox) and low levels of ABA (Osphs3-1) exhibit elevated tolerance or sensitivity to high-NH(4)(+) stress, respectively. Furthermore, ABA can decrease NH(4)(+)-induced oxidative damage and tissue NH(4)(+) accumulation by enhancing antioxidant and glutamine synthetase (GS)/glutamate synthetasae (GOGAT) enzyme activities. Using RNA sequencing and quantitative real-time PCR approaches, we ascertain that two genes, OsSAPK9 and OsbZIP20, are induced both by high NH(4)(+) and by ABA. Our data indicate that OsSAPK9 interacts with OsbZIP20, and can phosphorylate OsbZIP20 and activate its function. When OsSAPK9 or OsbZIP20 are knocked out in rice, ABA-mediated antioxidant and GS/GOGAT activity enhancement under high-NH(4)(+) stress disappear, and the two mutants are more sensitive to high-NH(4)(+) stress compared with their wild types. Taken together, our results suggest that ABA plays a positive role in regulating the OsSAPK9–OsbZIP20 pathway in rice to increase tolerance to high-NH(4)(+) stress. Oxford University Press 2020-07-25 2020-02-17 /pmc/articles/PMC7475098/ /pubmed/32064504 http://dx.doi.org/10.1093/jxb/eraa076 Text en © The Author(s) 2020. Published by Oxford University Press on behalf of the Society for Experimental Biology. http://creativecommons.org/licenses/by/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Papers Sun, Li Di, Dong-Wei Li, Guangjie Kronzucker, Herbert J Wu, Xiangyu Shi, Weiming Endogenous ABA alleviates rice ammonium toxicity by reducing ROS and free ammonium via regulation of the SAPK9–bZIP20 pathway |
title | Endogenous ABA alleviates rice ammonium toxicity by reducing ROS and free ammonium via regulation of the SAPK9–bZIP20 pathway |
title_full | Endogenous ABA alleviates rice ammonium toxicity by reducing ROS and free ammonium via regulation of the SAPK9–bZIP20 pathway |
title_fullStr | Endogenous ABA alleviates rice ammonium toxicity by reducing ROS and free ammonium via regulation of the SAPK9–bZIP20 pathway |
title_full_unstemmed | Endogenous ABA alleviates rice ammonium toxicity by reducing ROS and free ammonium via regulation of the SAPK9–bZIP20 pathway |
title_short | Endogenous ABA alleviates rice ammonium toxicity by reducing ROS and free ammonium via regulation of the SAPK9–bZIP20 pathway |
title_sort | endogenous aba alleviates rice ammonium toxicity by reducing ros and free ammonium via regulation of the sapk9–bzip20 pathway |
topic | Research Papers |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7475098/ https://www.ncbi.nlm.nih.gov/pubmed/32064504 http://dx.doi.org/10.1093/jxb/eraa076 |
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