[Effects of 6-BA and AsA on photosynthesis photoinhibition of attached poplar leaves under osmotic stress of root].
Identifieur interne : 004084 ( Main/Curation ); précédent : 004083; suivant : 004085[Effects of 6-BA and AsA on photosynthesis photoinhibition of attached poplar leaves under osmotic stress of root].
Auteurs : Yulong Feng [République populaire de Chine] ; Yongshuang Ma ; Zhili FengSource :
- Ying yong sheng tai xue bao = The journal of applied ecology [ 1001-9332 ] ; 2004.
Descripteurs français
- KwdFr :
- MESH :
- analyse : Espèces réactives de l'oxygène.
- pharmacologie : Acide ascorbique, Kinétine.
- physiologie : Photosynthèse, Plant, Populus.
- Composés benzyliques, Purines.
English descriptors
- KwdEn :
- MESH :
- chemical , analysis : Reactive Oxygen Species.
- chemical , pharmacology : Ascorbic Acid, Kinetin.
- chemical : Benzyl Compounds, Purines.
- physiology : Photosynthesis, Populus, Seedlings.
Abstract
In order to know more about the relationships between photosynthesis photoinhibition and reactive oxygen species metabolism, the effects of 6-benzyladenine (6-BA) and ascorbate (AsA) on net photosynthetic rate (Pn), apparent quantum yield (AQY), superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities, O2-* generation rate, and H2O2 and malondialdehyde (MDA) contents were studied with attached leaves of poplar clone seedlings under osmotic stress of root. Under osmotic stress, the photosynthesis photoinhibition of attached poplar leaves, judged by the significant decrease of Pn and AQY, was aggravated, and the balance of reactive oxygen species metabolism was destroyed. The superoxide dismutase (SOD) activity increased, but ascorbate peroxidase (APX) activity decreased. In the meantime, the O2-* generation rate and the contents of H2O2 and malondialdehyde (MDA) increased. When osmotic stressed poplar seedlings were pretreated with 6-BA and AsA, the activities of SOD and APX increased, O2-* generation rate and H2O2 and MDA contents decreased, and photosynthesis photoinhibition was alleviated. The contents of reactive oxygen species and MDA in poplar leaves were negatively correlated with net photosynthetic rate and apparent quantum yield. It's indicated that the photosynthesis photoinhibition of attached leaves of poplar clone seedlings had intrinsic relations with the accumulation of reactive oxygen species under osmotic stress of root, and the alleviation effects of 6-BA and AsA on photosynthesis photoinhibition were related to their promotion effects to the scavenging system of reactive oxygen species.
PubMed: 15825433
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pubmed:15825433Le document en format XML
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<author><name sortKey="Feng, Yulong" sort="Feng, Yulong" uniqKey="Feng Y" first="Yulong" last="Feng">Yulong Feng</name>
<affiliation wicri:level="1"><nlm:affiliation>Kunming Division, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, China. fyl@xtbg.ac.cn</nlm:affiliation>
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>Kunming Division, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming</wicri:regionArea>
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<author><name sortKey="Ma, Yongshuang" sort="Ma, Yongshuang" uniqKey="Ma Y" first="Yongshuang" last="Ma">Yongshuang Ma</name>
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<author><name sortKey="Feng, Zhili" sort="Feng, Zhili" uniqKey="Feng Z" first="Zhili" last="Feng">Zhili Feng</name>
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<author><name sortKey="Feng, Yulong" sort="Feng, Yulong" uniqKey="Feng Y" first="Yulong" last="Feng">Yulong Feng</name>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ascorbic Acid (pharmacology)</term>
<term>Benzyl Compounds (MeSH)</term>
<term>Kinetin (pharmacology)</term>
<term>Photosynthesis (physiology)</term>
<term>Populus (physiology)</term>
<term>Purines (MeSH)</term>
<term>Reactive Oxygen Species (analysis)</term>
<term>Seedlings (physiology)</term>
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<keywords scheme="KwdFr" xml:lang="fr"><term>Acide ascorbique (pharmacologie)</term>
<term>Composés benzyliques (MeSH)</term>
<term>Espèces réactives de l'oxygène (analyse)</term>
<term>Kinétine (pharmacologie)</term>
<term>Photosynthèse (physiologie)</term>
<term>Plant (physiologie)</term>
<term>Populus (physiologie)</term>
<term>Purines (MeSH)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Reactive Oxygen Species</term>
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<keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en"><term>Ascorbic Acid</term>
<term>Kinetin</term>
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<keywords scheme="MESH" type="chemical" xml:lang="en"><term>Benzyl Compounds</term>
<term>Purines</term>
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<keywords scheme="MESH" qualifier="analyse" xml:lang="fr"><term>Espèces réactives de l'oxygène</term>
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<keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr"><term>Acide ascorbique</term>
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<term>Plant</term>
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<term>Populus</term>
<term>Seedlings</term>
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<front><div type="abstract" xml:lang="en">In order to know more about the relationships between photosynthesis photoinhibition and reactive oxygen species metabolism, the effects of 6-benzyladenine (6-BA) and ascorbate (AsA) on net photosynthetic rate (Pn), apparent quantum yield (AQY), superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities, O2-* generation rate, and H2O2 and malondialdehyde (MDA) contents were studied with attached leaves of poplar clone seedlings under osmotic stress of root. Under osmotic stress, the photosynthesis photoinhibition of attached poplar leaves, judged by the significant decrease of Pn and AQY, was aggravated, and the balance of reactive oxygen species metabolism was destroyed. The superoxide dismutase (SOD) activity increased, but ascorbate peroxidase (APX) activity decreased. In the meantime, the O2-* generation rate and the contents of H2O2 and malondialdehyde (MDA) increased. When osmotic stressed poplar seedlings were pretreated with 6-BA and AsA, the activities of SOD and APX increased, O2-* generation rate and H2O2 and MDA contents decreased, and photosynthesis photoinhibition was alleviated. The contents of reactive oxygen species and MDA in poplar leaves were negatively correlated with net photosynthetic rate and apparent quantum yield. It's indicated that the photosynthesis photoinhibition of attached leaves of poplar clone seedlings had intrinsic relations with the accumulation of reactive oxygen species under osmotic stress of root, and the alleviation effects of 6-BA and AsA on photosynthesis photoinhibition were related to their promotion effects to the scavenging system of reactive oxygen species.</div>
</front>
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<Abstract><AbstractText>In order to know more about the relationships between photosynthesis photoinhibition and reactive oxygen species metabolism, the effects of 6-benzyladenine (6-BA) and ascorbate (AsA) on net photosynthetic rate (Pn), apparent quantum yield (AQY), superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities, O2-* generation rate, and H2O2 and malondialdehyde (MDA) contents were studied with attached leaves of poplar clone seedlings under osmotic stress of root. Under osmotic stress, the photosynthesis photoinhibition of attached poplar leaves, judged by the significant decrease of Pn and AQY, was aggravated, and the balance of reactive oxygen species metabolism was destroyed. The superoxide dismutase (SOD) activity increased, but ascorbate peroxidase (APX) activity decreased. In the meantime, the O2-* generation rate and the contents of H2O2 and malondialdehyde (MDA) increased. When osmotic stressed poplar seedlings were pretreated with 6-BA and AsA, the activities of SOD and APX increased, O2-* generation rate and H2O2 and MDA contents decreased, and photosynthesis photoinhibition was alleviated. The contents of reactive oxygen species and MDA in poplar leaves were negatively correlated with net photosynthetic rate and apparent quantum yield. It's indicated that the photosynthesis photoinhibition of attached leaves of poplar clone seedlings had intrinsic relations with the accumulation of reactive oxygen species under osmotic stress of root, and the alleviation effects of 6-BA and AsA on photosynthesis photoinhibition were related to their promotion effects to the scavenging system of reactive oxygen species.</AbstractText>
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