Ammonium regulates Fe deficiency responses by enhancing nitric oxide signaling in Arabidopsis thaliana

Ammonium ( N H 4 + ) plays an important role in phosphorus-deficiency responses in rice, but its role in responses to Fe deficiency remains unknown. Here, we demonstrate that the accumulation of N H 4 + plays a pivotal role when Arabidopsis thaliana plants are subject to Fe deficiency. The Arabidops...

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Veröffentlicht in:	Planta 2019-10, Vol.250 (4), p.1089-1102
Hauptverfasser:	Zhu, Xiao Fang, Dong, Xiao Ying, Wu, Qi, Shen, Ren Fang
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Sprache:	eng
Schlagworte:	Accumulation Agriculture Ammonium Ammonium Compounds - metabolism Arabidopsis Arabidopsis - genetics Arabidopsis - physiology Arabidopsis Proteins - genetics Arabidopsis Proteins - metabolism Arabidopsis thaliana Biological Transport Biomedical and Life Sciences Cell Wall - metabolism Cell walls Chelates Chlorosis Ecology Ferric-chelate reductase Forestry Gene Expression Regulation, Plant Hemicellulose Iron Deficiencies Iron deficiency Life Sciences Membrane Transport Proteins - genetics Membrane Transport Proteins - metabolism Mutation Nicotianamine Nitric oxide Nitric Oxide - metabolism ORIGINAL ARTICLE Phosphorus Phosphorus - metabolism Plant Sciences Polysaccharides - metabolism Reductases Shoots Signal Transduction Signs and symptoms Stress, Physiological Translocation
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description	Ammonium ( N H 4 + ) plays an important role in phosphorus-deficiency responses in rice, but its role in responses to Fe deficiency remains unknown. Here, we demonstrate that the accumulation of N H 4 + plays a pivotal role when Arabidopsis thaliana plants are subject to Fe deficiency. The Arabidopsis amt1-3 mutant, which is defective in endogenous N H 4 + sensing, exhibited increased sensitivity to Fe deficiency compared to WT (wild type; Col-0). In addition, exogenous application of N H 4 + significantly alleviated Fe deficiency symptoms in plants. N H 4 + triggers the production of nitric oxide (NO), which then induces ferric-chelate reductase (FCR) activity and accelerates the release of Fe from the cell wall, especially hemicellulose, thereby increasing the availability of soluble Fe in roots. N H 4 + also increases soluble Fe levels in shoots by upregulating genes involved in Fe translocation, such as FRD3 (FERRIC REDUCTASE DEFECTIVE3) and NAS1 (NICOTIANAMINE SYNTHASE1), hence, alleviating leaf chlorosis. Overall, N H 4 + plays an important role in the reutilization of Fe from the cell wall and the redistribution of Fe from root to shoot in Fe-deficient arabidopsis, a process dependent on NO accumulation.
doi_str_mv	10.1007/s00425-019-03202-6
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Here, we demonstrate that the accumulation of N H 4 + plays a pivotal role when Arabidopsis thaliana plants are subject to Fe deficiency. The Arabidopsis amt1-3 mutant, which is defective in endogenous N H 4 + sensing, exhibited increased sensitivity to Fe deficiency compared to WT (wild type; Col-0). In addition, exogenous application of N H 4 + significantly alleviated Fe deficiency symptoms in plants. N H 4 + triggers the production of nitric oxide (NO), which then induces ferric-chelate reductase (FCR) activity and accelerates the release of Fe from the cell wall, especially hemicellulose, thereby increasing the availability of soluble Fe in roots. N H 4 + also increases soluble Fe levels in shoots by upregulating genes involved in Fe translocation, such as FRD3 (FERRIC REDUCTASE DEFECTIVE3) and NAS1 (NICOTIANAMINE SYNTHASE1), hence, alleviating leaf chlorosis. 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Academic</collection><jtitle>Planta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhu, Xiao Fang</au><au>Dong, Xiao Ying</au><au>Wu, Qi</au><au>Shen, Ren Fang</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ammonium regulates Fe deficiency responses by enhancing nitric oxide signaling in Arabidopsis thaliana</atitle><jtitle>Planta</jtitle><stitle>Planta</stitle><addtitle>Planta</addtitle><date>2019-10-01</date><risdate>2019</risdate><volume>250</volume><issue>4</issue><spage>1089</spage><epage>1102</epage><pages>1089-1102</pages><issn>0032-0935</issn><eissn>1432-2048</eissn><abstract>Ammonium ( N H 4 + ) plays an important role in phosphorus-deficiency responses in rice, but its role in responses to Fe deficiency remains unknown. 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subjects	Accumulation Agriculture Ammonium Ammonium Compounds - metabolism Arabidopsis Arabidopsis - genetics Arabidopsis - physiology Arabidopsis Proteins - genetics Arabidopsis Proteins - metabolism Arabidopsis thaliana Biological Transport Biomedical and Life Sciences Cell Wall - metabolism Cell walls Chelates Chlorosis Ecology Ferric-chelate reductase Forestry Gene Expression Regulation, Plant Hemicellulose Iron Deficiencies Iron deficiency Life Sciences Membrane Transport Proteins - genetics Membrane Transport Proteins - metabolism Mutation Nicotianamine Nitric oxide Nitric Oxide - metabolism ORIGINAL ARTICLE Phosphorus Phosphorus - metabolism Plant Sciences Polysaccharides - metabolism Reductases Shoots Signal Transduction Signs and symptoms Stress, Physiological Translocation
title	Ammonium regulates Fe deficiency responses by enhancing nitric oxide signaling in Arabidopsis thaliana
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