Diffusive and Metabolic Limitations to Photosynthesis under Drought and Salinity in C3 Plants
Identifieur interne : 000360 ( Istex/Corpus ); précédent : 000359; suivant : 000361Diffusive and Metabolic Limitations to Photosynthesis under Drought and Salinity in C3 Plants
Auteurs : J. Flexas ; J. Bota ; F. Loreto ; G. Cornic ; T. D. SharkeySource :
- Plant Biology [ 1435-8603 ] ; 2004-05.
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Abstract
Abstract: Drought and salinity are two widespread environmental conditions leading to low water availability for plants. Low water availability is considered the main environmental factor limiting photosynthesis and, consequently, plant growth and yield worldwide. There has been a long‐standing controversy as to whether drought and salt stresses mainly limit photosynthesis through diffusive resistances or by metabolic impairment. Reviewing in vitro and in vivo measurements, it is concluded that salt and drought stress predominantly affect diffusion of CO2 in the leaves through a decrease of stomatal and mesophyll conductances, but not the biochemical capacity to assimilate CO2, at mild to rather severe stress levels. The general failure of metabolism observed at more severe stress suggests the occurrence of secondary oxidative stresses, particularly under high‐light conditions. Estimates of photosynthetic limitations based on the photosynthetic response to intercellular CO2 may lead to artefactual conclusions, even if patchy stomatal closure and the relative increase of cuticular conductance are taken into account, as decreasing mesophyll conductance can cause the CO2 concentration in chloroplasts of stressed leaves to be considerably lower than the intercellular CO2 concentration. Measurements based on the photosynthetic response to chloroplast CO2 often confirm that the photosynthetic capacity is preserved but photosynthesis is limited by diffusive resistances in drought and salt‐stressed leaves.
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DOI: 10.1055/s-2004-820867
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Low water availability is considered the main environmental factor limiting photosynthesis and, consequently, plant growth and yield worldwide. There has been a long‐standing controversy as to whether drought and salt stresses mainly limit photosynthesis through diffusive resistances or by metabolic impairment. Reviewing in vitro and in vivo measurements, it is concluded that salt and drought stress predominantly affect diffusion of CO2 in the leaves through a decrease of stomatal and mesophyll conductances, but not the biochemical capacity to assimilate CO2, at mild to rather severe stress levels. The general failure of metabolism observed at more severe stress suggests the occurrence of secondary oxidative stresses, particularly under high‐light conditions. Estimates of photosynthetic limitations based on the photosynthetic response to intercellular CO2 may lead to artefactual conclusions, even if patchy stomatal closure and the relative increase of cuticular conductance are taken into account, as decreasing mesophyll conductance can cause the CO2 concentration in chloroplasts of stressed leaves to be considerably lower than the intercellular CO2 concentration. Measurements based on the photosynthetic response to chloroplast CO2 often confirm that the photosynthetic capacity is preserved but photosynthesis is limited by diffusive resistances in drought and salt‐stressed leaves.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>J. Flexas</name><affiliations><json:string>Universitat de les Illes Balears, Palma de Mallorca, Balears, Spain</json:string></affiliations></json:item><json:item><name>J. Bota</name><affiliations><json:string>Universitat de les Illes Balears, Palma de Mallorca, Balears, Spain</json:string></affiliations></json:item><json:item><name>F. Loreto</name><affiliations><json:string>CNR ‐ IBAF, Monterotondo Scalo, Italy</json:string></affiliations></json:item><json:item><name>G. Cornic</name><affiliations><json:string>Université de Paris‐Sud, Orsay, France</json:string></affiliations></json:item><json:item><name>T. D. 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Low water availability is considered the main environmental factor limiting photosynthesis and, consequently, plant growth and yield worldwide. There has been a long‐standing controversy as to whether drought and salt stresses mainly limit photosynthesis through diffusive resistances or by metabolic impairment. Reviewing in vitro and in vivo measurements, it is concluded that salt and drought stress predominantly affect diffusion of CO2 in the leaves through a decrease of stomatal and mesophyll conductances, but not the biochemical capacity to assimilate CO2, at mild to rather severe stress levels. The general failure of metabolism observed at more severe stress suggests the occurrence of secondary oxidative stresses, particularly under high‐light conditions. Estimates of photosynthetic limitations based on the photosynthetic response to intercellular CO2 may lead to artefactual conclusions, even if patchy stomatal closure and the relative increase of cuticular conductance are taken into account, as decreasing mesophyll conductance can cause the CO2 concentration in chloroplasts of stressed leaves to be considerably lower than the intercellular CO2 concentration. 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D.</givenNames><familyName>Sharkey</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="ES"><unparsedAffiliation>Universitat de les Illes Balears, Palma de Mallorca, Balears, Spain</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="IT"><unparsedAffiliation>CNR ‐ IBAF, Monterotondo Scalo, Italy</unparsedAffiliation></affiliation><affiliation xml:id="a3" countryCode="FR"><unparsedAffiliation>Université de Paris‐Sud, Orsay, France</unparsedAffiliation></affiliation><affiliation xml:id="a4" countryCode="US"><unparsedAffiliation>University of Wisconsin‐Madison, USA</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">Diffusive limitations to photosynthesis</keyword><keyword xml:id="k2">metabolic limitations to photosynthesis</keyword><keyword xml:id="k3">drought</keyword><keyword xml:id="k4">salinity</keyword><keyword xml:id="k5">photosynthetic metabolism</keyword><keyword xml:id="k6">stomatal‐mesophyll conductance</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><p><b>Abstract: </b> Drought and salinity are two widespread environmental conditions leading to low water availability for plants. Low water availability is considered the main environmental factor limiting photosynthesis and, consequently, plant growth and yield worldwide. There has been a long‐standing controversy as to whether drought and salt stresses mainly limit photosynthesis through diffusive resistances or by metabolic impairment. Reviewing <i>in vitro</i> and <i>in vivo</i> measurements, it is concluded that salt and drought stress predominantly affect diffusion of CO<sub>2</sub> in the leaves through a decrease of stomatal and mesophyll conductances, but not the biochemical capacity to assimilate CO<sub>2</sub>, at mild to rather severe stress levels. The general failure of metabolism observed at more severe stress suggests the occurrence of secondary oxidative stresses, particularly under high‐light conditions. Estimates of photosynthetic limitations based on the photosynthetic response to intercellular CO<sub>2</sub> may lead to artefactual conclusions, even if patchy stomatal closure and the relative increase of cuticular conductance are taken into account, as decreasing mesophyll conductance can cause the CO<sub>2</sub> concentration in chloroplasts of stressed leaves to be considerably lower than the intercellular CO<sub>2</sub> concentration. Measurements based on the photosynthetic response to chloroplast CO<sub>2</sub> often confirm that the photosynthetic capacity is preserved but photosynthesis is limited by diffusive resistances in drought and salt‐stressed leaves.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Diffusive and Metabolic Limitations to Photosynthesis under Drought and Salinity in C3 Plants</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Diffusive and Metabolic Limitations to Photosynthesis under Drought and Salinity in C</title></titleInfo><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Flexas</namePart><affiliation>Universitat de les Illes Balears, Palma de Mallorca, Balears, Spain</affiliation><description>Correspondence: Laboratori de Fisiologia Vegetal Departament de Biologia Universitat de les Illes Balears Carretera de Valldemossa Km 7.5 07122 Palma de Mallorca, Balears Spain E‐mail: </description><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Bota</namePart><affiliation>Universitat de les Illes Balears, Palma de Mallorca, Balears, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">F.</namePart><namePart type="family">Loreto</namePart><affiliation>CNR ‐ IBAF, Monterotondo Scalo, Italy</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">G.</namePart><namePart type="family">Cornic</namePart><affiliation>Université de Paris‐Sud, Orsay, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">T. D.</namePart><namePart type="family">Sharkey</namePart><affiliation>University of Wisconsin‐Madison, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="review-article" displayLabel="reviewArticle"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2004-05</dateIssued><edition>Received: November 12, 2003; Accepted: February 9, 2003</edition><copyrightDate encoding="w3cdtf">2004</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="references">107</extent></physicalDescription><abstract lang="en">Abstract: Drought and salinity are two widespread environmental conditions leading to low water availability for plants. 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Measurements based on the photosynthetic response to chloroplast CO2 often confirm that the photosynthetic capacity is preserved but photosynthesis is limited by diffusive resistances in drought and salt‐stressed leaves.</abstract><subject lang="en"><genre>Keywords</genre><topic>Diffusive limitations to photosynthesis</topic><topic>metabolic limitations to photosynthesis</topic><topic>drought</topic><topic>salinity</topic><topic>photosynthetic metabolism</topic><topic>stomatal‐mesophyll conductance</topic></subject><relatedItem type="host"><titleInfo><title>Plant Biology</title></titleInfo><genre type="Journal">journal</genre><identifier type="ISSN">1435-8603</identifier><identifier type="eISSN">1438-8677</identifier><identifier type="DOI">10.1111/(ISSN)1438-8677</identifier><identifier type="PublisherID">PLB</identifier><part><date>2004</date><detail type="volume"><caption>vol.</caption><number>6</number></detail><detail type="issue"><caption>no.</caption><number>3</number></detail><extent unit="pages"><start>269</start><end>279</end><total>11</total></extent></part></relatedItem><identifier type="istex">E938760CF175C06EB9FECC553822A724BAC52E4C</identifier><identifier type="DOI">10.1055/s-2004-820867</identifier><identifier type="ArticleID">PLB269</identifier><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Publishing Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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|texte= Diffusive and Metabolic Limitations to Photosynthesis under Drought and Salinity in C3 Plants
}}
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