PoplarV1, Main, Exploration, bibRecord, 004122

A cellular timetable of autumn senescence.

Identifieur interne : 004122 ( Main/Exploration ); précédent : 004121; suivant : 004123

A cellular timetable of autumn senescence.

Auteurs : Johanna Keskitalo [Suède] ; Gustaf Bergquist ; Per Gardeström ; Stefan Jansson

Source :

Plant physiology [ 0032-0889 ] ; 2005.

RBID : pubmed:16299183

Descripteurs français

KwdFr :
- Anthocyanes (métabolisme), Azote (métabolisme), Caroténoïdes (métabolisme), Chlorophylle (métabolisme), Chloroplastes (métabolisme), Feuilles de plante (croissance et développement), Feuilles de plante (cytologie), Feuilles de plante (métabolisme), Microscopie électronique (MeSH), Mitochondries (métabolisme), Phosphore (métabolisme), Photobiologie (MeSH), Photopériode (MeSH), Photosynthèse (MeSH), Pigments biologiques (métabolisme), Populus (croissance et développement), Populus (cytologie), Populus (métabolisme), Saisons (MeSH).
MESH :
- croissance et développement : Feuilles de plante, Populus.
- cytologie : Feuilles de plante, Populus.
- métabolisme : Anthocyanes, Azote, Caroténoïdes, Chlorophylle, Chloroplastes, Feuilles de plante, Mitochondries, Phosphore, Pigments biologiques, Populus.
- Microscopie électronique, Photobiologie, Photopériode, Photosynthèse, Saisons.

English descriptors

KwdEn :
- Anthocyanins (metabolism), Carotenoids (metabolism), Chlorophyll (metabolism), Chloroplasts (metabolism), Microscopy, Electron (MeSH), Mitochondria (metabolism), Nitrogen (metabolism), Phosphorus (metabolism), Photobiology (MeSH), Photoperiod (MeSH), Photosynthesis (MeSH), Pigments, Biological (metabolism), Plant Leaves (cytology), Plant Leaves (growth & development), Plant Leaves (metabolism), Populus (cytology), Populus (growth & development), Populus (metabolism), Seasons (MeSH).
MESH :
- chemical , metabolism : Anthocyanins, Carotenoids, Chlorophyll, Nitrogen, Phosphorus, Pigments, Biological.
- cytology : Plant Leaves, Populus.
- growth & development : Plant Leaves, Populus.
- metabolism : Chloroplasts, Mitochondria, Plant Leaves, Populus.
- Microscopy, Electron, Photobiology, Photoperiod, Photosynthesis, Seasons.

Abstract

We have studied autumn leaf senescence in a free-growing aspen (Populus tremula) by following changes in pigment, metabolite and nutrient content, photosynthesis, and cell and organelle integrity. The senescence process started on September 11, 2003, apparently initiated solely by the photoperiod, and progressed steadily without any obvious influence of other environmental signals. For example, after this date, senescing leaves accumulated anthocyanins in response to conditions inducing photooxidative stress, but at the beginning of September the leaves did not. Degradation of leaf constituents took place over an 18-d period, and, although the cells in each leaf did not all senesce in parallel, senescence in the tree as a whole was synchronous. Lutein and beta-carotene were degraded in parallel with chlorophyll, whereas neoxanthin and the xanthophyll cycle pigments were retained longer. Chloroplasts in each cell were rapidly converted to gerontoplasts and many, although not all, cells died. From September 19, when chlorophyll levels had dropped by 50%, mitochondrial respiration provided the energy for nutrient remobilization. Remobilization seemed to stop on September 29, probably due to the cessation of phloem transport, but, up to abscission of the last leaves (over 1 week later), some cells were metabolically active and had chlorophyll-containing gerontoplasts. About 80% of the nitrogen and phosphorus was remobilized, and on September 29 a sudden change occurred in the delta15N of the cellular content, indicating that volatile compounds may have been released.

DOI: 10.1104/pp.105.066845
PubMed: 16299183
PubMed Central: PMC1310548

Affiliations:

Suède

Links toward previous steps (curation, corpus...)

to stream Main, to step Corpus: 003F23
to stream Main, to step Curation: 003F23

Le document en format XML

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<front><div type="abstract" xml:lang="en">We have studied autumn leaf senescence in a free-growing aspen (Populus tremula) by following changes in pigment, metabolite and nutrient content, photosynthesis, and cell and organelle integrity. The senescence process started on September 11, 2003, apparently initiated solely by the photoperiod, and progressed steadily without any obvious influence of other environmental signals. For example, after this date, senescing leaves accumulated anthocyanins in response to conditions inducing photooxidative stress, but at the beginning of September the leaves did not. Degradation of leaf constituents took place over an 18-d period, and, although the cells in each leaf did not all senesce in parallel, senescence in the tree as a whole was synchronous. Lutein and beta-carotene were degraded in parallel with chlorophyll, whereas neoxanthin and the xanthophyll cycle pigments were retained longer. Chloroplasts in each cell were rapidly converted to gerontoplasts and many, although not all, cells died. From September 19, when chlorophyll levels had dropped by 50%, mitochondrial respiration provided the energy for nutrient remobilization. Remobilization seemed to stop on September 29, probably due to the cessation of phloem transport, but, up to abscission of the last leaves (over 1 week later), some cells were metabolically active and had chlorophyll-containing gerontoplasts. About 80% of the nitrogen and phosphorus was remobilized, and on September 29 a sudden change occurred in the delta15N of the cellular content, indicating that volatile compounds may have been released.</div>
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<Abstract><AbstractText>We have studied autumn leaf senescence in a free-growing aspen (Populus tremula) by following changes in pigment, metabolite and nutrient content, photosynthesis, and cell and organelle integrity. The senescence process started on September 11, 2003, apparently initiated solely by the photoperiod, and progressed steadily without any obvious influence of other environmental signals. For example, after this date, senescing leaves accumulated anthocyanins in response to conditions inducing photooxidative stress, but at the beginning of September the leaves did not. Degradation of leaf constituents took place over an 18-d period, and, although the cells in each leaf did not all senesce in parallel, senescence in the tree as a whole was synchronous. Lutein and beta-carotene were degraded in parallel with chlorophyll, whereas neoxanthin and the xanthophyll cycle pigments were retained longer. Chloroplasts in each cell were rapidly converted to gerontoplasts and many, although not all, cells died. From September 19, when chlorophyll levels had dropped by 50%, mitochondrial respiration provided the energy for nutrient remobilization. Remobilization seemed to stop on September 29, probably due to the cessation of phloem transport, but, up to abscission of the last leaves (over 1 week later), some cells were metabolically active and had chlorophyll-containing gerontoplasts. About 80% of the nitrogen and phosphorus was remobilized, and on September 29 a sudden change occurred in the delta15N of the cellular content, indicating that volatile compounds may have been released.</AbstractText>
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<country name="Suède"><noRegion><name sortKey="Keskitalo, Johanna" sort="Keskitalo, Johanna" uniqKey="Keskitalo J" first="Johanna" last="Keskitalo">Johanna Keskitalo</name>
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</country>
</tree>
</affiliations>
</record>

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EXPLOR_STEP=$WICRI_ROOT/Bois/explor/PoplarV1/Data/Main/Exploration

HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 004122 | SxmlIndent | more

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{{Explor lien
   |wiki=    Bois
   |area=    PoplarV1
   |flux=    Main
   |étape=   Exploration
   |type=    RBID
   |clé=     pubmed:16299183
   |texte=   A cellular timetable of autumn senescence.
}}

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HfdIndexSelect -h $EXPLOR_AREA/Data/Main/Exploration/RBID.i   -Sk "pubmed:16299183" \
       | HfdSelect -Kh $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd   \
       | NlmPubMed2Wicri -a PoplarV1

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Serveur d'exploration sur le peuplier

A cellular timetable of autumn senescence.

A cellular timetable of autumn senescence.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki