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Measurements of 18 O-Pi uptake indicate fast metabolism of phosphate in tree roots.

Identifieur interne : 000849 ( Main/Exploration ); précédent : 000848; suivant : 000850

Measurements of 18 O-Pi uptake indicate fast metabolism of phosphate in tree roots.

Auteurs : U. Scheerer [Allemagne] ; F. Netzer [Allemagne] ; A F Bauer [Allemagne] ; C. Herschbach [Allemagne]

Source :

RBID : pubmed:30311347

Descripteurs français

English descriptors

Abstract

Phosphorus (P) nutrition of beech ecosystems depends on soil processes, plant internal P cycling and P acquisition. P uptake of trees in the field is currently not validated due to the lack of an experimental approach applicable in natural forests. Application of radiolabelled tracers such as 33 P and 32 P is limited to special research sites and not allowed in natural environments. Moreover, only one stable isotope of P, namely 31 P, exists. One alternative tool to measure P acquisition in the field could be the use of 18 O-labelled 31 P-phosphate (31 P18 O43- ). Phosphate (Pi ) uptake rates calculated from the 18 O enrichment of dried root material after application of 31 Pi18 O43- via nutrient solution was always lower compared to 33 P incorporation, did not show increasing rates of Pi uptake at P deficiency under controlled conditions, and did not reveal seasonal fluctuations in the field. Consequently, a clear correlation between 33 P-based and 18 O-based Pi uptake by roots could not be established. Comparison of Pi  uptake rates achieved from 33 P-Pi and 18 O-Pi application led to the conclusion of high Pi metabolism in roots after Pi uptake. The replacement of 18 O by 16 O from water in 18 O-Pi during root influx, but most probably after Pi uptake into roots, due to metabolic activities, indicates high and fast turnover of Pi . Hence, the use of 18 O-Pi as an alternative tool to estimate Pi acquisition of trees in the field must consider the increase of 18 O abundance in root water that was disregarded in dried root material.

DOI: 10.1111/plb.12922
PubMed: 30311347


Affiliations:


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Le document en format XML

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<title xml:lang="en">Measurements of
<sup>18</sup>
O-P
<sub>i</sub>
uptake indicate fast metabolism of phosphate in tree roots.</title>
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<name sortKey="Scheerer, U" sort="Scheerer, U" uniqKey="Scheerer U" first="U" last="Scheerer">U. Scheerer</name>
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<term>Biological Transport (MeSH)</term>
<term>Fagus (metabolism)</term>
<term>Oxygen Isotopes (metabolism)</term>
<term>Phosphates (metabolism)</term>
<term>Phosphorus Radioisotopes (metabolism)</term>
<term>Plant Roots (metabolism)</term>
<term>Trees (metabolism)</term>
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<term>Arbres (métabolisme)</term>
<term>Fagus (métabolisme)</term>
<term>Isotopes de l'oxygène (métabolisme)</term>
<term>Phosphates (métabolisme)</term>
<term>Racines de plante (métabolisme)</term>
<term>Radio-isotopes du phosphore (métabolisme)</term>
<term>Transport biologique (MeSH)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en">
<term>Oxygen Isotopes</term>
<term>Phosphates</term>
<term>Phosphorus Radioisotopes</term>
</keywords>
<keywords scheme="MESH" qualifier="metabolism" xml:lang="en">
<term>Fagus</term>
<term>Plant Roots</term>
<term>Trees</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr">
<term>Arbres</term>
<term>Fagus</term>
<term>Isotopes de l'oxygène</term>
<term>Phosphates</term>
<term>Racines de plante</term>
<term>Radio-isotopes du phosphore</term>
</keywords>
<keywords scheme="MESH" xml:lang="en">
<term>Biological Transport</term>
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<front>
<div type="abstract" xml:lang="en">Phosphorus (P) nutrition of beech ecosystems depends on soil processes, plant internal P cycling and P acquisition. P uptake of trees in the field is currently not validated due to the lack of an experimental approach applicable in natural forests. Application of radiolabelled tracers such as
<sup>33</sup>
P and
<sup>32</sup>
P is limited to special research sites and not allowed in natural environments. Moreover, only one stable isotope of P, namely
<sup>31</sup>
P, exists. One alternative tool to measure P acquisition in the field could be the use of
<sup>18</sup>
O-labelled
<sup>31</sup>
P-phosphate (
<sup>31</sup>
P
<sup>18</sup>
O
<sub>4</sub>
<sup>3-</sup>
). Phosphate (P
<sub>i</sub>
) uptake rates calculated from the
<sup>18</sup>
O enrichment of dried root material after application of
<sup>31</sup>
P
<sub>i</sub>
<sup>18</sup>
O
<sub>4</sub>
<sup>3-</sup>
via nutrient solution was always lower compared to
<sup>33</sup>
P incorporation, did not show increasing rates of P
<sub>i</sub>
uptake at P deficiency under controlled conditions, and did not reveal seasonal fluctuations in the field. Consequently, a clear correlation between
<sup>33</sup>
P-based and
<sup>18</sup>
O-based P
<sub>i</sub>
uptake by roots could not be established. Comparison of P
<sub>i</sub>
 uptake rates achieved from
<sup>33</sup>
P-P
<sub>i</sub>
and
<sup>18</sup>
O-P
<sub>i</sub>
application led to the conclusion of high P
<sub>i</sub>
metabolism in roots after P
<sub>i</sub>
uptake. The replacement of
<sup>18</sup>
O by
<sup>16</sup>
O from water in
<sup>18</sup>
O-P
<sub>i</sub>
during root influx, but most probably after P
<sub>i</sub>
uptake into roots, due to metabolic activities, indicates high and fast turnover of P
<sub>i</sub>
. Hence, the use of
<sup>18</sup>
O-P
<sub>i</sub>
as an alternative tool to estimate P
<sub>i</sub>
acquisition of trees in the field must consider the increase of
<sup>18</sup>
O abundance in root water that was disregarded in dried root material.</div>
</front>
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<Day>02</Day>
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<ISSN IssnType="Electronic">1438-8677</ISSN>
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<Issue>4</Issue>
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<Title>Plant biology (Stuttgart, Germany)</Title>
<ISOAbbreviation>Plant Biol (Stuttg)</ISOAbbreviation>
</Journal>
<ArticleTitle>Measurements of
<sup>18</sup>
O-P
<sub>i</sub>
uptake indicate fast metabolism of phosphate in tree roots.</ArticleTitle>
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<Abstract>
<AbstractText>Phosphorus (P) nutrition of beech ecosystems depends on soil processes, plant internal P cycling and P acquisition. P uptake of trees in the field is currently not validated due to the lack of an experimental approach applicable in natural forests. Application of radiolabelled tracers such as
<sup>33</sup>
P and
<sup>32</sup>
P is limited to special research sites and not allowed in natural environments. Moreover, only one stable isotope of P, namely
<sup>31</sup>
P, exists. One alternative tool to measure P acquisition in the field could be the use of
<sup>18</sup>
O-labelled
<sup>31</sup>
P-phosphate (
<sup>31</sup>
P
<sup>18</sup>
O
<sub>4</sub>
<sup>3-</sup>
). Phosphate (P
<sub>i</sub>
) uptake rates calculated from the
<sup>18</sup>
O enrichment of dried root material after application of
<sup>31</sup>
P
<sub>i</sub>
<sup>18</sup>
O
<sub>4</sub>
<sup>3-</sup>
via nutrient solution was always lower compared to
<sup>33</sup>
P incorporation, did not show increasing rates of P
<sub>i</sub>
uptake at P deficiency under controlled conditions, and did not reveal seasonal fluctuations in the field. Consequently, a clear correlation between
<sup>33</sup>
P-based and
<sup>18</sup>
O-based P
<sub>i</sub>
uptake by roots could not be established. Comparison of P
<sub>i</sub>
 uptake rates achieved from
<sup>33</sup>
P-P
<sub>i</sub>
and
<sup>18</sup>
O-P
<sub>i</sub>
application led to the conclusion of high P
<sub>i</sub>
metabolism in roots after P
<sub>i</sub>
uptake. The replacement of
<sup>18</sup>
O by
<sup>16</sup>
O from water in
<sup>18</sup>
O-P
<sub>i</sub>
during root influx, but most probably after P
<sub>i</sub>
uptake into roots, due to metabolic activities, indicates high and fast turnover of P
<sub>i</sub>
. Hence, the use of
<sup>18</sup>
O-P
<sub>i</sub>
as an alternative tool to estimate P
<sub>i</sub>
acquisition of trees in the field must consider the increase of
<sup>18</sup>
O abundance in root water that was disregarded in dried root material.</AbstractText>
<CopyrightInformation>© 2018 German Society for Plant Sciences and The Royal Botanical Society of the Netherlands.</CopyrightInformation>
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</AffiliationInfo>
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<LastName>Netzer</LastName>
<ForeName>F</ForeName>
<Initials>F</Initials>
<AffiliationInfo>
<Affiliation>Chair of Tree Physiology, Institute of Forest Sciences, Albert-Ludwigs-University Freiburg, Freiburg, Germany.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Chair of Ecosystem Physiology, Institute of Forest Sciences, Albert-Ludwigs-University Freiburg, Freiburg, Germany.</Affiliation>
</AffiliationInfo>
</Author>
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<AffiliationInfo>
<Affiliation>Chair of Tree Physiology, Institute of Forest Sciences, Albert-Ludwigs-University Freiburg, Freiburg, Germany.</Affiliation>
</AffiliationInfo>
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<AffiliationInfo>
<Affiliation>Chair of Tree Physiology, Institute of Forest Sciences, Albert-Ludwigs-University Freiburg, Freiburg, Germany.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Chair of Ecosystem Physiology, Institute of Forest Sciences, Albert-Ludwigs-University Freiburg, Freiburg, Germany.</Affiliation>
</AffiliationInfo>
</Author>
</AuthorList>
<Language>eng</Language>
<GrantList CompleteYN="Y">
<Grant>
<GrantID>HE 3003/6-1 and HE 3003/6-2</GrantID>
<Agency>Deutsche Forschungsgemeinschaft</Agency>
<Country></Country>
</Grant>
</GrantList>
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<Month>01</Month>
<Day>25</Day>
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<Country>England</Country>
<MedlineTA>Plant Biol (Stuttg)</MedlineTA>
<NlmUniqueID>101148926</NlmUniqueID>
<ISSNLinking>1435-8603</ISSNLinking>
</MedlineJournalInfo>
<ChemicalList>
<Chemical>
<RegistryNumber>0</RegistryNumber>
<NameOfSubstance UI="D010103">Oxygen Isotopes</NameOfSubstance>
</Chemical>
<Chemical>
<RegistryNumber>0</RegistryNumber>
<NameOfSubstance UI="D010710">Phosphates</NameOfSubstance>
</Chemical>
<Chemical>
<RegistryNumber>0</RegistryNumber>
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<MeshHeading>
<DescriptorName UI="D001692" MajorTopicYN="N">Biological Transport</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D029964" MajorTopicYN="N">Fagus</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D010103" MajorTopicYN="N">Oxygen Isotopes</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D010710" MajorTopicYN="N">Phosphates</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D010761" MajorTopicYN="N">Phosphorus Radioisotopes</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D018517" MajorTopicYN="N">Plant Roots</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D014197" MajorTopicYN="N">Trees</DescriptorName>
<QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName>
</MeshHeading>
</MeshHeadingList>
<KeywordList Owner="NOTNLM">
<Keyword MajorTopicYN="N">18O-phosphate uptake</Keyword>
<Keyword MajorTopicYN="N">33P-phosphate uptake</Keyword>
<Keyword MajorTopicYN="N">Fagus sylvatica </Keyword>
<Keyword MajorTopicYN="N">Populus x canescens </Keyword>
<Keyword MajorTopicYN="N">Michaelis-Menten kinetics</Keyword>
<Keyword MajorTopicYN="N">excised non-mycorrhizal roots</Keyword>
<Keyword MajorTopicYN="N">field study</Keyword>
</KeywordList>
</MedlineCitation>
<PubmedData>
<History>
<PubMedPubDate PubStatus="received">
<Year>2018</Year>
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