OrangerV1, Main, Exploration, bibRecord, 001D49

Lutein Accumulation in the Absence of Zeaxanthin Restores Nonphotochemical Quenching in the Arabidopsis thaliana npq1 Mutant[W][OA]

Identifieur interne : 001D49 ( Main/Exploration ); précédent : 001D48; suivant : 001D50

Lutein Accumulation in the Absence of Zeaxanthin Restores Nonphotochemical Quenching in the Arabidopsis thaliana npq1 Mutant[W][OA]

Auteurs : Zhirong Li [États-Unis] ; Tae Kyu Ahn [États-Unis] ; Thomas J. Avenson [États-Unis] ; Matteo Ballottari [Italie] ; Jeffrey A. Cruz [États-Unis] ; David M. Kramer [États-Unis] ; Roberto Bassi [Italie] ; Graham R. Fleming [États-Unis] ; Jay D. Keasling [États-Unis] ; Krishna K. Niyogi [États-Unis]

Source :

The Plant Cell [ 1040-4651 ] ; 2009.

RBID : PMC:2714924

Abstract

Plants protect themselves from excess absorbed light energy through thermal dissipation, which is measured as nonphotochemical quenching of chlorophyll fluorescence (NPQ). The major component of NPQ, qE, is induced by high transthylakoid ΔpH in excess light and depends on the xanthophyll cycle, in which violaxanthin and antheraxanthin are deepoxidized to form zeaxanthin. To investigate the xanthophyll dependence of qE, we identified suppressor of zeaxanthin-less1 (szl1) as a suppressor of the Arabidopsis thaliana npq1 mutant, which lacks zeaxanthin. szl1 npq1 plants have a partially restored qE but lack zeaxanthin and have low levels of violaxanthin, antheraxanthin, and neoxanthin. However, they accumulate more lutein and α-carotene than the wild type. szl1 contains a point mutation in the lycopene β-cyclase (LCYB) gene. Based on the pigment analysis, LCYB appears to be the major lycopene β-cyclase and is not involved in neoxanthin synthesis. The Lhcb4 (CP29) and Lhcb5 (CP26) protein levels are reduced by 50% in szl1 npq1 relative to the wild type, whereas other Lhcb proteins are present at wild-type levels. Analysis of carotenoid radical cation formation and leaf absorbance changes strongly suggest that the higher amount of lutein substitutes for zeaxanthin in qE, implying a direct role in qE, as well as a mechanism that is weakly sensitive to carotenoid structural properties.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2714924

DOI: 10.1105/tpc.109.066571
PubMed: 19549928
PubMed Central: 2714924

Affiliations:

Le document en format XML

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<xref ref-type="fn" rid="fn3">[OA]</xref>
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<author><name sortKey="Kramer, David M" sort="Kramer, David M" uniqKey="Kramer D" first="David M." last="Kramer">David M. Kramer</name>
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<affiliation wicri:level="1"><nlm:aff id="aff4">Dipartimento Scientifico e Tecnologico, Università di Verona, I-37134 Verona, Italy</nlm:aff>
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<author><name sortKey="Fleming, Graham R" sort="Fleming, Graham R" uniqKey="Fleming G" first="Graham R." last="Fleming">Graham R. Fleming</name>
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<country xml:lang="fr">États-Unis</country>
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<country xml:lang="fr">États-Unis</country>
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</placeName>
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<series><title level="j">The Plant Cell</title>
<idno type="ISSN">1040-4651</idno>
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<imprint><date when="2009">2009</date>
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<front><div type="abstract" xml:lang="en"><p>Plants protect themselves from excess absorbed light energy through thermal dissipation, which is measured as nonphotochemical quenching of chlorophyll fluorescence (NPQ). The major component of NPQ, qE, is induced by high transthylakoid ΔpH in excess light and depends on the xanthophyll cycle, in which violaxanthin and antheraxanthin are deepoxidized to form zeaxanthin. To investigate the xanthophyll dependence of qE, we identified <italic>suppressor of zeaxanthin-less1</italic>
 (<italic>szl1</italic>
) as a suppressor of the <italic>Arabidopsis thaliana</italic>
 <italic>npq1</italic>
 mutant, which lacks zeaxanthin. <italic>szl1 npq1</italic>
 plants have a partially restored qE but lack zeaxanthin and have low levels of violaxanthin, antheraxanthin, and neoxanthin. However, they accumulate more lutein and α-carotene than the wild type. <italic>szl1</italic>
 contains a point mutation in the lycopene β-cyclase (<italic>LCYB</italic>
) gene. Based on the pigment analysis, LCYB appears to be the major lycopene β-cyclase and is not involved in neoxanthin synthesis. The Lhcb4 (CP29) and Lhcb5 (CP26) protein levels are reduced by 50% in <italic>szl1 npq1</italic>
 relative to the wild type, whereas other Lhcb proteins are present at wild-type levels. Analysis of carotenoid radical cation formation and leaf absorbance changes strongly suggest that the higher amount of lutein substitutes for zeaxanthin in qE, implying a direct role in qE, as well as a mechanism that is weakly sensitive to carotenoid structural properties.</p>
</div>
</front>
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<name sortKey="Fleming, Graham R" sort="Fleming, Graham R" uniqKey="Fleming G" first="Graham R." last="Fleming">Graham R. Fleming</name>
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   |texte=   Lutein Accumulation in the Absence of Zeaxanthin Restores Nonphotochemical Quenching in the Arabidopsis thaliana npq1 Mutant[W][OA]
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Lutein Accumulation in the Absence of Zeaxanthin Restores Nonphotochemical Quenching in the Arabidopsis thaliana npq1 Mutant[W][OA]

Lutein Accumulation in the Absence of Zeaxanthin Restores Nonphotochemical Quenching in the Arabidopsis thaliana npq1 Mutant[W][OA]

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