The Interaction between Auxin and Nitric Oxide Regulates Root Growth in Response to Iron Deficiency in Rice

Fe deficiency (-Fe) is a common abiotic stress that affects the root development of plants. Auxin and nitric oxide (NO) are key regulator of root growth under -Fe. However, the interactions between auxin and NO regulate root growth in response to Fe deficiency are complex and unclear. In this study,...

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Autores principales: Sun, Huwei, Feng, Fan, Liu, Juan, Zhao, Quanzhi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5743679/
https://www.ncbi.nlm.nih.gov/pubmed/29312409
http://dx.doi.org/10.3389/fpls.2017.02169
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author Sun, Huwei
Feng, Fan
Liu, Juan
Zhao, Quanzhi
author_facet Sun, Huwei
Feng, Fan
Liu, Juan
Zhao, Quanzhi
author_sort Sun, Huwei
collection PubMed
description Fe deficiency (-Fe) is a common abiotic stress that affects the root development of plants. Auxin and nitric oxide (NO) are key regulator of root growth under -Fe. However, the interactions between auxin and NO regulate root growth in response to Fe deficiency are complex and unclear. In this study, the indole-3-acetic acid (IAA) and NO levels in roots, and the responses of root growth in rice to different levels of Fe supply were investigated using wild type (WT), ospin1b and osnia2 mutants. -Fe promoted LR formation but inhibited seminal root elongation. IAA levels, [(3)H] IAA transport, and expression levels of PIN1a-c genes in roots were reduced under -Fe, suggesting that polar auxin transport from shoots to roots was decreased. Application of IAA to -Fe seedlings restored seminal root length, but not LR density, to levels similar to those under normal Fe (+Fe), and the seminal root length was shorter in two ospin1b mutants relative to WT under +Fe, but not under -Fe, confirming that auxin transport participates in -Fe-inhibited seminal root elongation. Moreover, -Fe-induced LR density and -Fe-inhibited seminal root elongation paralleled NO production in roots. Interestingly, similar NO accumulation and responses of LR density and root elongation were observed in osnia2 mutants compared to WT, and the higher expression of NOA gene under -Fe, suggesting that -Fe-induced NO was generated via the NO synthase-like pathway rather than the nitrate reductase pathway. However, IAA could restore the functions of NO in inhibiting seminal root elongation, but did not replace the role of NO-induced LR formation under -Fe. Overall, our findings suggested that NO functions downstream of auxin in regulating LR formation; NO-inhibited seminal root elongation by decreasing meristem activity in root tips under -Fe, with the involvement of auxin.
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spelling pubmed-57436792018-01-08 The Interaction between Auxin and Nitric Oxide Regulates Root Growth in Response to Iron Deficiency in Rice Sun, Huwei Feng, Fan Liu, Juan Zhao, Quanzhi Front Plant Sci Plant Science Fe deficiency (-Fe) is a common abiotic stress that affects the root development of plants. Auxin and nitric oxide (NO) are key regulator of root growth under -Fe. However, the interactions between auxin and NO regulate root growth in response to Fe deficiency are complex and unclear. In this study, the indole-3-acetic acid (IAA) and NO levels in roots, and the responses of root growth in rice to different levels of Fe supply were investigated using wild type (WT), ospin1b and osnia2 mutants. -Fe promoted LR formation but inhibited seminal root elongation. IAA levels, [(3)H] IAA transport, and expression levels of PIN1a-c genes in roots were reduced under -Fe, suggesting that polar auxin transport from shoots to roots was decreased. Application of IAA to -Fe seedlings restored seminal root length, but not LR density, to levels similar to those under normal Fe (+Fe), and the seminal root length was shorter in two ospin1b mutants relative to WT under +Fe, but not under -Fe, confirming that auxin transport participates in -Fe-inhibited seminal root elongation. Moreover, -Fe-induced LR density and -Fe-inhibited seminal root elongation paralleled NO production in roots. Interestingly, similar NO accumulation and responses of LR density and root elongation were observed in osnia2 mutants compared to WT, and the higher expression of NOA gene under -Fe, suggesting that -Fe-induced NO was generated via the NO synthase-like pathway rather than the nitrate reductase pathway. However, IAA could restore the functions of NO in inhibiting seminal root elongation, but did not replace the role of NO-induced LR formation under -Fe. Overall, our findings suggested that NO functions downstream of auxin in regulating LR formation; NO-inhibited seminal root elongation by decreasing meristem activity in root tips under -Fe, with the involvement of auxin. Frontiers Media S.A. 2017-12-22 /pmc/articles/PMC5743679/ /pubmed/29312409 http://dx.doi.org/10.3389/fpls.2017.02169 Text en Copyright © 2017 Sun, Feng, Liu and Zhao. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Plant Science
Sun, Huwei
Feng, Fan
Liu, Juan
Zhao, Quanzhi
The Interaction between Auxin and Nitric Oxide Regulates Root Growth in Response to Iron Deficiency in Rice
title The Interaction between Auxin and Nitric Oxide Regulates Root Growth in Response to Iron Deficiency in Rice
title_full The Interaction between Auxin and Nitric Oxide Regulates Root Growth in Response to Iron Deficiency in Rice
title_fullStr The Interaction between Auxin and Nitric Oxide Regulates Root Growth in Response to Iron Deficiency in Rice
title_full_unstemmed The Interaction between Auxin and Nitric Oxide Regulates Root Growth in Response to Iron Deficiency in Rice
title_short The Interaction between Auxin and Nitric Oxide Regulates Root Growth in Response to Iron Deficiency in Rice
title_sort interaction between auxin and nitric oxide regulates root growth in response to iron deficiency in rice
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5743679/
https://www.ncbi.nlm.nih.gov/pubmed/29312409
http://dx.doi.org/10.3389/fpls.2017.02169
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