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Mechanisms underlying enhanced Cd translocation and tolerance in roots of Populus euramericana in response to nitrogen fertilization.

Identifieur interne : 000846 ( Main/Exploration ); précédent : 000845; suivant : 000847

Mechanisms underlying enhanced Cd translocation and tolerance in roots of Populus euramericana in response to nitrogen fertilization.

Auteurs : Junyu Song [République populaire de Chine] ; Patrick M. Finnegan [Australie] ; Wenhui Liu [République populaire de Chine] ; Xiang Li [République populaire de Chine] ; Jean W H. Yong [Suède] ; Jiuting Xu [République populaire de Chine] ; Qi Zhang [République populaire de Chine] ; Yuxin Wen [République populaire de Chine] ; Kexin Qin [République populaire de Chine] ; Jinze Guo [République populaire de Chine] ; Ting Li [République populaire de Chine] ; Chang Zhao [République populaire de Chine] ; Yi Zhang [République populaire de Chine]

Source :

RBID : pubmed:31481203

Descripteurs français

English descriptors

Abstract

A pot experiment was conducted to evaluate how nitrogen (N) availability influences cadmium (Cd) absorption, translocation and stress tolerance in roots of Populus euramericana. Seedling growth was sensitive to N deficiency, but it was unaltered by Cd exposure. Cadmium absorption by roots was promoted by N deficiency, resulting in a higher root Cd concentration compared to the N-sufficient condition. Fine-root length was tightly correlated (R2 = 0.73) with Cd concentration in roots, indicating that vigorous fine-root proliferation under N deficiency contributed to active absorption and accumulation of Cd in roots. Despite accumulation in roots, Cd translocation from roots to shoots was less active under N deficiency compared to N sufficiency. This was related to elevated glutathione reductase (GR) activity and glutathione (GSH) levels in roots after N application, which may not only promote antioxidant defence, but also facilitate the formation of GSH-Cd complexes that are uploaded into root cylinders. Nitrogen application also promoted antioxidant defense in roots via increased production of phytohormones and the level of enzymatic and non-enzymatic antioxidants. Transcript levels for genes responsible for antioxidant defense, Cd detoxification and Cd uploading were increased in roots by N application. The N-stimulated Cd tolerance, detoxification and uploading in roots are factors likely to promote Cd translocation from roots to shoots, which may enhance the biological capacity of this poplar species for phytoremediation of Cd pollution.

DOI: 10.1016/j.plantsci.2019.110206
PubMed: 31481203


Affiliations:


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Le document en format XML

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<name sortKey="Zhang, Qi" sort="Zhang, Qi" uniqKey="Zhang Q" first="Qi" last="Zhang">Qi Zhang</name>
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<name sortKey="Wen, Yuxin" sort="Wen, Yuxin" uniqKey="Wen Y" first="Yuxin" last="Wen">Yuxin Wen</name>
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<nlm:affiliation>State Key Laboratory of Crop Stress Biology in Arid Areas, College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100, PR China. Electronic address: wwwyx_0520@163.com.</nlm:affiliation>
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>State Key Laboratory of Crop Stress Biology in Arid Areas, College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100</wicri:regionArea>
<wicri:noRegion>712100</wicri:noRegion>
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<name sortKey="Qin, Kexin" sort="Qin, Kexin" uniqKey="Qin K" first="Kexin" last="Qin">Kexin Qin</name>
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<nlm:affiliation>State Key Laboratory of Crop Stress Biology in Arid Areas, College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100, PR China. Electronic address: 18821714041@163.com.</nlm:affiliation>
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<name sortKey="Guo, Jinze" sort="Guo, Jinze" uniqKey="Guo J" first="Jinze" last="Guo">Jinze Guo</name>
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<name sortKey="Li, Ting" sort="Li, Ting" uniqKey="Li T" first="Ting" last="Li">Ting Li</name>
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<nlm:affiliation>State Key Laboratory of Crop Stress Biology in Arid Areas, College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100, PR China. Electronic address: lt1077506777@163.com.</nlm:affiliation>
<country xml:lang="fr">République populaire de Chine</country>
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<name sortKey="Zhao, Chang" sort="Zhao, Chang" uniqKey="Zhao C" first="Chang" last="Zhao">Chang Zhao</name>
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<name sortKey="Zhang, Yi" sort="Zhang, Yi" uniqKey="Zhang Y" first="Yi" last="Zhang">Yi Zhang</name>
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<nlm:affiliation>State Key Laboratory of Crop Stress Biology in Arid Areas, College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100, PR China. Electronic address: zhangyi.1978@163.com.</nlm:affiliation>
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<title level="j">Plant science : an international journal of experimental plant biology</title>
<idno type="eISSN">1873-2259</idno>
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<term>Biodegradation, Environmental (MeSH)</term>
<term>Cadmium (metabolism)</term>
<term>Cadmium (toxicity)</term>
<term>Fertilizers (MeSH)</term>
<term>Glutathione (metabolism)</term>
<term>Models, Biological (MeSH)</term>
<term>Nitrogen (deficiency)</term>
<term>Oxidation-Reduction (MeSH)</term>
<term>Plant Roots (physiology)</term>
<term>Populus (physiology)</term>
<term>Seedlings (physiology)</term>
<term>Stress, Physiological (MeSH)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr">
<term>Azote (déficit)</term>
<term>Cadmium (métabolisme)</term>
<term>Cadmium (toxicité)</term>
<term>Dépollution biologique de l'environnement (MeSH)</term>
<term>Engrais (MeSH)</term>
<term>Glutathion (métabolisme)</term>
<term>Modèles biologiques (MeSH)</term>
<term>Oxydoréduction (MeSH)</term>
<term>Plant (physiologie)</term>
<term>Populus (physiologie)</term>
<term>Racines de plante (physiologie)</term>
<term>Stress physiologique (MeSH)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="deficiency" xml:lang="en">
<term>Nitrogen</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en">
<term>Cadmium</term>
<term>Glutathione</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="toxicity" xml:lang="en">
<term>Cadmium</term>
</keywords>
<keywords scheme="MESH" qualifier="déficit" xml:lang="fr">
<term>Azote</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr">
<term>Cadmium</term>
<term>Glutathion</term>
</keywords>
<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr">
<term>Plant</term>
<term>Populus</term>
<term>Racines de plante</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en">
<term>Plant Roots</term>
<term>Populus</term>
<term>Seedlings</term>
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<term>Cadmium</term>
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<term>Dépollution biologique de l'environnement</term>
<term>Engrais</term>
<term>Modèles biologiques</term>
<term>Oxydoréduction</term>
<term>Stress physiologique</term>
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<front>
<div type="abstract" xml:lang="en">A pot experiment was conducted to evaluate how nitrogen (N) availability influences cadmium (Cd) absorption, translocation and stress tolerance in roots of Populus euramericana. Seedling growth was sensitive to N deficiency, but it was unaltered by Cd exposure. Cadmium absorption by roots was promoted by N deficiency, resulting in a higher root Cd concentration compared to the N-sufficient condition. Fine-root length was tightly correlated (R
<sup>2</sup>
= 0.73) with Cd concentration in roots, indicating that vigorous fine-root proliferation under N deficiency contributed to active absorption and accumulation of Cd in roots. Despite accumulation in roots, Cd translocation from roots to shoots was less active under N deficiency compared to N sufficiency. This was related to elevated glutathione reductase (GR) activity and glutathione (GSH) levels in roots after N application, which may not only promote antioxidant defence, but also facilitate the formation of GSH-Cd complexes that are uploaded into root cylinders. Nitrogen application also promoted antioxidant defense in roots via increased production of phytohormones and the level of enzymatic and non-enzymatic antioxidants. Transcript levels for genes responsible for antioxidant defense, Cd detoxification and Cd uploading were increased in roots by N application. The N-stimulated Cd tolerance, detoxification and uploading in roots are factors likely to promote Cd translocation from roots to shoots, which may enhance the biological capacity of this poplar species for phytoremediation of Cd pollution.</div>
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<Year>2019</Year>
<Month>12</Month>
<Day>23</Day>
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<DateRevised>
<Year>2020</Year>
<Month>09</Month>
<Day>30</Day>
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<JournalIssue CitedMedium="Internet">
<Volume>287</Volume>
<PubDate>
<Year>2019</Year>
<Month>Oct</Month>
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<Title>Plant science : an international journal of experimental plant biology</Title>
<ISOAbbreviation>Plant Sci</ISOAbbreviation>
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<ArticleTitle>Mechanisms underlying enhanced Cd translocation and tolerance in roots of Populus euramericana in response to nitrogen fertilization.</ArticleTitle>
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<Abstract>
<AbstractText>A pot experiment was conducted to evaluate how nitrogen (N) availability influences cadmium (Cd) absorption, translocation and stress tolerance in roots of Populus euramericana. Seedling growth was sensitive to N deficiency, but it was unaltered by Cd exposure. Cadmium absorption by roots was promoted by N deficiency, resulting in a higher root Cd concentration compared to the N-sufficient condition. Fine-root length was tightly correlated (R
<sup>2</sup>
= 0.73) with Cd concentration in roots, indicating that vigorous fine-root proliferation under N deficiency contributed to active absorption and accumulation of Cd in roots. Despite accumulation in roots, Cd translocation from roots to shoots was less active under N deficiency compared to N sufficiency. This was related to elevated glutathione reductase (GR) activity and glutathione (GSH) levels in roots after N application, which may not only promote antioxidant defence, but also facilitate the formation of GSH-Cd complexes that are uploaded into root cylinders. Nitrogen application also promoted antioxidant defense in roots via increased production of phytohormones and the level of enzymatic and non-enzymatic antioxidants. Transcript levels for genes responsible for antioxidant defense, Cd detoxification and Cd uploading were increased in roots by N application. The N-stimulated Cd tolerance, detoxification and uploading in roots are factors likely to promote Cd translocation from roots to shoots, which may enhance the biological capacity of this poplar species for phytoremediation of Cd pollution.</AbstractText>
<CopyrightInformation>Copyright © 2019 Elsevier B.V. All rights reserved.</CopyrightInformation>
</Abstract>
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<Author ValidYN="Y">
<LastName>Song</LastName>
<ForeName>Junyu</ForeName>
<Initials>J</Initials>
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<Affiliation>State Key Laboratory of Crop Stress Biology in Arid Areas, College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100, PR China. Electronic address: songjunyu0318@163.com.</Affiliation>
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<Affiliation>State Key Laboratory of Crop Stress Biology in Arid Areas, College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100, PR China.</Affiliation>
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<LastName>Yong</LastName>
<ForeName>Jean W H</ForeName>
<Initials>JWH</Initials>
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<Affiliation>Department of Biosystems and Technology, Swedish University of Agricultural Science, Alanrp, Sweden. Electronic address: jean.yong@slu.se.</Affiliation>
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<Initials>Q</Initials>
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<ForeName>Jinze</ForeName>
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<AffiliationInfo>
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</AffiliationInfo>
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<Initials>Y</Initials>
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</AffiliationInfo>
</Author>
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<Language>eng</Language>
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<PublicationType UI="D016428">Journal Article</PublicationType>
</PublicationTypeList>
<ArticleDate DateType="Electronic">
<Year>2019</Year>
<Month>07</Month>
<Day>29</Day>
</ArticleDate>
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<Country>Ireland</Country>
<MedlineTA>Plant Sci</MedlineTA>
<NlmUniqueID>9882015</NlmUniqueID>
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</Chemical>
<Chemical>
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<NameOfSubstance UI="D002104">Cadmium</NameOfSubstance>
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<Chemical>
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<NameOfSubstance UI="D005978">Glutathione</NameOfSubstance>
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<Chemical>
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<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
<QualifierName UI="Q000633" MajorTopicYN="N">toxicity</QualifierName>
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<MeshHeading>
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</MeshHeading>
<MeshHeading>
<DescriptorName UI="D010084" MajorTopicYN="N">Oxidation-Reduction</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D018517" MajorTopicYN="N">Plant Roots</DescriptorName>
<QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName>
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<Keyword MajorTopicYN="N">Cd detoxification</Keyword>
<Keyword MajorTopicYN="N">Cd translocation</Keyword>
<Keyword MajorTopicYN="N">Nitrogen</Keyword>
<Keyword MajorTopicYN="N">Root proliferation</Keyword>
<Keyword MajorTopicYN="N">Stress tolerance</Keyword>
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<Month>04</Month>
<Day>04</Day>
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<Month>06</Month>
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