Mycorrhizal-mediated lower proline accumulation in Poncirus trifoliata under water deficit derives from the integration of inhibition of proline synthesis with increase of proline degradation.
Identifieur interne : 001A51 ( Main/Corpus ); précédent : 001A50; suivant : 001A52Mycorrhizal-mediated lower proline accumulation in Poncirus trifoliata under water deficit derives from the integration of inhibition of proline synthesis with increase of proline degradation.
Auteurs : Ying-Ning Zou ; Qiang-Sheng Wu ; Yong-Ming Huang ; Qiu-Dan Ni ; Xin-Hua HeSource :
- PloS one [ 1932-6203 ] ; 2013.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Proline.
- metabolism : Plant Roots.
- microbiology : Plant Roots, Poncirus.
- physiology : Mycorrhizae, Plant Leaves, Poncirus, Seedlings.
- Biomass, Droughts.
Abstract
Proline accumulation was often correlated with drought tolerance of plants infected by arbuscular mycorrhizal fungi (AMF), whereas lower proline in some AM plants including citrus was also found under drought stress and the relevant mechanisms have not been fully elaborated. In this study proline accumulation and activity of key enzymes relative to proline biosynthesis (▵(1)-pyrroline-5-carboxylate synthetase, P5CS; ornithine-δ-aminotransferase, OAT) and degradation (proline dehydrogenase, ProDH) were determined in trifoliate orange (Poncirus trifoliata, a widely used citrus rootstock) inoculated with or without Funneliformis mosseae and under well-watered (WW) or water deficit (WD). AMF colonization significantly increased plant height, stem diameter, leaf number, root volume, biomass production of both leaves and roots and leaf relative water content, irrespectively of water status. Water deficit induced more tissue proline accumulation, in company with an increase of P5CS activity, but a decrease of OAT and ProDH activity, no matter whether under AM or no-AM. Compared with no-AM treatment, AM treatment resulted in lower proline concentration and content in leaf, root, and total plant under both WW and WD. The AMF colonization significantly decreased the activity of both P5CS and OAT in leaf, root, and total plant under WW and WD, except for an insignificant difference of root OAT under WD. The AMF inoculation also generally increased tissue ProDH activity under WW and WD. Plant proline content significantly positively correlated with plant P5CS activity, negatively with plant ProDH activity, but not with plant OAT activity. These results suggest that AM plants may suffer less from WD, thereby inducing lower proline accumulation, which derives from the integration of an inhibition of proline synthesis with an enhancement of proline degradation.
DOI: 10.1371/journal.pone.0080568
PubMed: 24260421
PubMed Central: PMC3832396
Links to Exploration step
pubmed:24260421Le document en format XML
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<author><name sortKey="Zou, Ying Ning" sort="Zou, Ying Ning" uniqKey="Zou Y" first="Ying-Ning" last="Zou">Ying-Ning Zou</name>
<affiliation><nlm:affiliation>College of Horticulture and Gardening, Yangtze University, Jingzhou, China.</nlm:affiliation>
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<author><name sortKey="Wu, Qiang Sheng" sort="Wu, Qiang Sheng" uniqKey="Wu Q" first="Qiang-Sheng" last="Wu">Qiang-Sheng Wu</name>
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<author><name sortKey="Huang, Yong Ming" sort="Huang, Yong Ming" uniqKey="Huang Y" first="Yong-Ming" last="Huang">Yong-Ming Huang</name>
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<author><name sortKey="Ni, Qiu Dan" sort="Ni, Qiu Dan" uniqKey="Ni Q" first="Qiu-Dan" last="Ni">Qiu-Dan Ni</name>
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<author><name sortKey="He, Xin Hua" sort="He, Xin Hua" uniqKey="He X" first="Xin-Hua" last="He">Xin-Hua He</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">Mycorrhizal-mediated lower proline accumulation in Poncirus trifoliata under water deficit derives from the integration of inhibition of proline synthesis with increase of proline degradation.</title>
<author><name sortKey="Zou, Ying Ning" sort="Zou, Ying Ning" uniqKey="Zou Y" first="Ying-Ning" last="Zou">Ying-Ning Zou</name>
<affiliation><nlm:affiliation>College of Horticulture and Gardening, Yangtze University, Jingzhou, China.</nlm:affiliation>
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<author><name sortKey="Huang, Yong Ming" sort="Huang, Yong Ming" uniqKey="Huang Y" first="Yong-Ming" last="Huang">Yong-Ming Huang</name>
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<author><name sortKey="Ni, Qiu Dan" sort="Ni, Qiu Dan" uniqKey="Ni Q" first="Qiu-Dan" last="Ni">Qiu-Dan Ni</name>
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<author><name sortKey="He, Xin Hua" sort="He, Xin Hua" uniqKey="He X" first="Xin-Hua" last="He">Xin-Hua He</name>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Biomass (MeSH)</term>
<term>Droughts (MeSH)</term>
<term>Mycorrhizae (physiology)</term>
<term>Plant Leaves (physiology)</term>
<term>Plant Roots (metabolism)</term>
<term>Plant Roots (microbiology)</term>
<term>Poncirus (microbiology)</term>
<term>Poncirus (physiology)</term>
<term>Proline (metabolism)</term>
<term>Seedlings (physiology)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Proline</term>
</keywords>
<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Plant Roots</term>
</keywords>
<keywords scheme="MESH" qualifier="microbiology" xml:lang="en"><term>Plant Roots</term>
<term>Poncirus</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Mycorrhizae</term>
<term>Plant Leaves</term>
<term>Poncirus</term>
<term>Seedlings</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Biomass</term>
<term>Droughts</term>
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<front><div type="abstract" xml:lang="en">Proline accumulation was often correlated with drought tolerance of plants infected by arbuscular mycorrhizal fungi (AMF), whereas lower proline in some AM plants including citrus was also found under drought stress and the relevant mechanisms have not been fully elaborated. In this study proline accumulation and activity of key enzymes relative to proline biosynthesis (▵(1)-pyrroline-5-carboxylate synthetase, P5CS; ornithine-δ-aminotransferase, OAT) and degradation (proline dehydrogenase, ProDH) were determined in trifoliate orange (Poncirus trifoliata, a widely used citrus rootstock) inoculated with or without Funneliformis mosseae and under well-watered (WW) or water deficit (WD). AMF colonization significantly increased plant height, stem diameter, leaf number, root volume, biomass production of both leaves and roots and leaf relative water content, irrespectively of water status. Water deficit induced more tissue proline accumulation, in company with an increase of P5CS activity, but a decrease of OAT and ProDH activity, no matter whether under AM or no-AM. Compared with no-AM treatment, AM treatment resulted in lower proline concentration and content in leaf, root, and total plant under both WW and WD. The AMF colonization significantly decreased the activity of both P5CS and OAT in leaf, root, and total plant under WW and WD, except for an insignificant difference of root OAT under WD. The AMF inoculation also generally increased tissue ProDH activity under WW and WD. Plant proline content significantly positively correlated with plant P5CS activity, negatively with plant ProDH activity, but not with plant OAT activity. These results suggest that AM plants may suffer less from WD, thereby inducing lower proline accumulation, which derives from the integration of an inhibition of proline synthesis with an enhancement of proline degradation. </div>
</front>
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<Abstract><AbstractText>Proline accumulation was often correlated with drought tolerance of plants infected by arbuscular mycorrhizal fungi (AMF), whereas lower proline in some AM plants including citrus was also found under drought stress and the relevant mechanisms have not been fully elaborated. In this study proline accumulation and activity of key enzymes relative to proline biosynthesis (▵(1)-pyrroline-5-carboxylate synthetase, P5CS; ornithine-δ-aminotransferase, OAT) and degradation (proline dehydrogenase, ProDH) were determined in trifoliate orange (Poncirus trifoliata, a widely used citrus rootstock) inoculated with or without Funneliformis mosseae and under well-watered (WW) or water deficit (WD). AMF colonization significantly increased plant height, stem diameter, leaf number, root volume, biomass production of both leaves and roots and leaf relative water content, irrespectively of water status. Water deficit induced more tissue proline accumulation, in company with an increase of P5CS activity, but a decrease of OAT and ProDH activity, no matter whether under AM or no-AM. Compared with no-AM treatment, AM treatment resulted in lower proline concentration and content in leaf, root, and total plant under both WW and WD. The AMF colonization significantly decreased the activity of both P5CS and OAT in leaf, root, and total plant under WW and WD, except for an insignificant difference of root OAT under WD. The AMF inoculation also generally increased tissue ProDH activity under WW and WD. Plant proline content significantly positively correlated with plant P5CS activity, negatively with plant ProDH activity, but not with plant OAT activity. These results suggest that AM plants may suffer less from WD, thereby inducing lower proline accumulation, which derives from the integration of an inhibition of proline synthesis with an enhancement of proline degradation. </AbstractText>
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