Magnesium deficiency–induced impairment of photosynthesis in leaves of fruiting Citrus reticulata trees accompanied by up‐regulation of antioxidant metabolism to avoid photo‐oxidative damage
Identifieur interne : 001485 ( Main/Exploration ); précédent : 001484; suivant : 001486Magnesium deficiency–induced impairment of photosynthesis in leaves of fruiting Citrus reticulata trees accompanied by up‐regulation of antioxidant metabolism to avoid photo‐oxidative damage
Auteurs : Ning Tang [République populaire de Chine] ; Yan Li [République populaire de Chine] ; Li-Song Chen [République populaire de Chine]Source :
- Journal of Plant Nutrition and Soil Science [ 1436-8730 ] ; 2012-10.
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Abstract
Limited data are available on the physiological responses of leaves from fruiting trees to magnesium (Mg) deficiency. Magnesium deficiency–induced effects on photosystem II (PSII) photochemistry in leaves of fruiting (Citrus reticulate cv. Ponkan) trees were assessed by the chlorophyll a fluorescence (OJIP) transient. Magnesium deficiency decreased leaf CO2 assimilation and carbohydrates, but had no effect on intercellular CO2 concentration. Activity of ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco) and concentrations of Chlorophyll (Chl) and carotenoids (Car) decreased to a lesser extent than CO2 assimilation. Chlorophyll a fluorescence transient from Mg‐deficient leaves had increased O step and decreased P step, accompanied by positive ΔL, ΔK, ΔJ, and ΔI bands. Magnesium deficiency decreased maximum quantum yield of primary photochemistry (Fv/Fm), quantum yield of electron transport from Q<$>_A^‐<$> to the photosystem I (PSI) end electron acceptors (φR0), maximum amplitude of IP phase and total performance index (PItot, abs), but increased deactiviation of oxygen‐evolving complex (OEC) and energy dissipation. Magnesium‐deficient leaves had higher or similar activities of antioxidant enzymes except for lower catalase (CAT) activity, higher or similar concentrations of antioxidant metabolites, and a higher ratio of Car : Chl. Magnesium‐deficiency did not affect concentration of malondialdehyde (MDA) and ratios of ascorbate (ASC) to ASC + dehydroascorbate (DHA) and reduced glutathione (GSH) to GSH + oxidized glutathione (GSSG). In conclusion, Mg deficiency–induced impairment of the whole photosynthetic electron transport chain may be the main factor contributing to decreased CO2 assimilation. Enhanced energy dissipation and antioxidant metabolism provide sufficient protection to Mg‐deficient leaves against photo‐oxidative damage.
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DOI: 10.1002/jpln.201100329
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Magnesium deficiency–induced impairment of photosynthesis in leaves of fruiting Citrus reticulata trees accompanied by up‐regulation of antioxidant metabolism to avoid photo‐oxidative damage</title><author><name sortKey="Tang, Ning" sort="Tang, Ning" uniqKey="Tang N" first="Ning" last="Tang">Ning Tang</name></author><author><name sortKey="Li, Yan" sort="Li, Yan" uniqKey="Li Y" first="Yan" last="Li">Yan Li</name></author><author><name sortKey="Chen, Li Ong" sort="Chen, Li Ong" uniqKey="Chen L" first="Li-Song" last="Chen">Li-Song Chen</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:DDA350CBB979112443D738778E574E95C8E47D05</idno><date when="2012" year="2012">2012</date><idno type="doi">10.1002/jpln.201100329</idno><idno type="url">https://api.istex.fr/document/DDA350CBB979112443D738778E574E95C8E47D05/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001909</idno><idno type="wicri:Area/Istex/Curation">001908</idno><idno type="wicri:Area/Istex/Checkpoint">000155</idno><idno type="wicri:doubleKey">1436-8730:2012:Tang N:magnesium:deficiency:induced</idno><idno type="wicri:Area/Main/Merge">001500</idno><idno type="wicri:Area/Main/Curation">001485</idno><idno type="wicri:Area/Main/Exploration">001485</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Magnesium deficiency–induced impairment of photosynthesis in leaves of fruiting Citrus reticulata trees accompanied by up‐regulation of antioxidant metabolism to avoid photo‐oxidative damage</title><author><name sortKey="Tang, Ning" sort="Tang, Ning" uniqKey="Tang N" first="Ning" last="Tang">Ning Tang</name><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>College of Resources and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002</wicri:regionArea><placeName><settlement type="city">Fuzhou</settlement><region type="province">Fujian</region></placeName></affiliation><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Institute of Horticultural Plant Physiology, Biochemistry and Molecular Biology, Fujian Agriculture and Forestry University, Fuzhou 350002</wicri:regionArea><placeName><settlement type="city">Fuzhou</settlement><region type="province">Fujian</region></placeName></affiliation><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Present address: Bioengineering College, Chongqing University, Chongqing 400044</wicri:regionArea><wicri:noRegion>Chongqing 400044</wicri:noRegion></affiliation></author><author><name sortKey="Li, Yan" sort="Li, Yan" uniqKey="Li Y" first="Yan" last="Li">Yan Li</name><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>College of Resources and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002</wicri:regionArea><placeName><settlement type="city">Fuzhou</settlement><region type="province">Fujian</region></placeName></affiliation></author><author><name sortKey="Chen, Li Ong" sort="Chen, Li Ong" uniqKey="Chen L" first="Li-Song" last="Chen">Li-Song Chen</name><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>College of Resources and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002</wicri:regionArea><placeName><settlement type="city">Fuzhou</settlement><region type="province">Fujian</region></placeName></affiliation><affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Plant Nutrition and Soil Science</title><title level="j" type="abbrev">Z. 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Bodenk.</title><idno type="ISSN">1436-8730</idno><idno type="eISSN">1522-2624</idno><imprint><publisher>WILEY‐VCH Verlag</publisher><pubPlace>Weinheim</pubPlace><date type="published" when="2012-10">2012-10</date><biblScope unit="volume">175</biblScope><biblScope unit="issue">5</biblScope><biblScope unit="page" from="784">784</biblScope><biblScope unit="page" to="793">793</biblScope></imprint><idno type="ISSN">1436-8730</idno></series><idno type="istex">DDA350CBB979112443D738778E574E95C8E47D05</idno><idno type="DOI">10.1002/jpln.201100329</idno><idno type="ArticleID">JPLN201100329</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1436-8730</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Citrus reticulata</term><term>chlorophyll a fluorescence (OJIP) transient</term><term>photosystem</term><term>ribulose‐1,5‐bisphosphate carboxylase/oxygenase</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Limited data are available on the physiological responses of leaves from fruiting trees to magnesium (Mg) deficiency. Magnesium deficiency–induced effects on photosystem II (PSII) photochemistry in leaves of fruiting (Citrus reticulate cv. Ponkan) trees were assessed by the chlorophyll a fluorescence (OJIP) transient. Magnesium deficiency decreased leaf CO2 assimilation and carbohydrates, but had no effect on intercellular CO2 concentration. Activity of ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco) and concentrations of Chlorophyll (Chl) and carotenoids (Car) decreased to a lesser extent than CO2 assimilation. Chlorophyll a fluorescence transient from Mg‐deficient leaves had increased O step and decreased P step, accompanied by positive ΔL, ΔK, ΔJ, and ΔI bands. Magnesium deficiency decreased maximum quantum yield of primary photochemistry (Fv/Fm), quantum yield of electron transport from Q<$>_A^‐<$> to the photosystem I (PSI) end electron acceptors (φR0), maximum amplitude of IP phase and total performance index (PItot, abs), but increased deactiviation of oxygen‐evolving complex (OEC) and energy dissipation. Magnesium‐deficient leaves had higher or similar activities of antioxidant enzymes except for lower catalase (CAT) activity, higher or similar concentrations of antioxidant metabolites, and a higher ratio of Car : Chl. Magnesium‐deficiency did not affect concentration of malondialdehyde (MDA) and ratios of ascorbate (ASC) to ASC + dehydroascorbate (DHA) and reduced glutathione (GSH) to GSH + oxidized glutathione (GSSG). In conclusion, Mg deficiency–induced impairment of the whole photosynthetic electron transport chain may be the main factor contributing to decreased CO2 assimilation. Enhanced energy dissipation and antioxidant metabolism provide sufficient protection to Mg‐deficient leaves against photo‐oxidative damage.</div></front></TEI><affiliations><list><country><li>République populaire de Chine</li></country><region><li>Fujian</li></region><settlement><li>Fuzhou</li></settlement></list><tree><country name="République populaire de Chine"><region name="Fujian"><name sortKey="Tang, Ning" sort="Tang, Ning" uniqKey="Tang N" first="Ning" last="Tang">Ning Tang</name></region><name sortKey="Chen, Li Ong" sort="Chen, Li Ong" uniqKey="Chen L" first="Li-Song" last="Chen">Li-Song Chen</name><name sortKey="Li, Yan" sort="Li, Yan" uniqKey="Li Y" first="Yan" last="Li">Yan Li</name><name sortKey="Tang, Ning" sort="Tang, Ning" uniqKey="Tang N" first="Ning" last="Tang">Ning Tang</name><name sortKey="Tang, Ning" sort="Tang, Ning" uniqKey="Tang N" first="Ning" last="Tang">Ning Tang</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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