Seasonal and diurnal variations in gene expression in the desert legume Retama raetam

Détails

ID Serval
serval:BIB_BA82DB16EE52
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Seasonal and diurnal variations in gene expression in the desert legume Retama raetam
Périodique
Plant Cell and Environment
Auteur(s)
Merquiol E., Pneuli L., Cohen M., Simovitch M., Rachmilevitch S., Goloubinoff P., Kaplan A., Mittler R.
ISSN
0140-7791
Statut éditorial
Publié
Date de publication
2002
Peer-reviewed
Oui
Volume
25
Numéro
12
Pages
1627-1638
Langue
anglais
Résumé
Studying plants growing naturally within their habitat can contribute greatly to our understanding of molecular and biochemical processes involved in the response of plants to changes in environmental conditions. Seasonal and diurnal variations in the expression of several transcripts involved in the defence of plants against abiotic stresses, i.e. transcripts encoding dehydrins, heat shock proteins, and anti-oxidative enzymes, were followed in Retama raetam plants that grow naturally within an arid dune ecosystem. These were associated with changes in environmental parameters simultaneously recorded at the research sites. It was found that the expression pattern of some transcripts correlated with changes in environmental conditions in the different plants during the year. In contrast, the expression pattern of other transcripts appeared to be plant specific and may be associated with phenotypic variability (plasticity). Transcripts encoding different heat shock proteins were induced in a co-ordinated manner, suggesting that their corresponding products function as a chaperone network. Measurements of photosynthetic activity revealed a diurnal cycle in R. raetam. Photosynthesis was highest during early morning, declined toward the stressful midday hours and recovered at late afternoon. The present analysis suggests that R. raetam uses a combination of different avoidance strategies in co-ordination with active defence mechanisms to withstand the stressful conditions that prevail within the desert ecosystem.
Mots-clé
Retama raetam, active oxygen, desert plants, drought, ecosystem, environmental stress, heat shock, photosynthesis, plasticity
Web of science
Open Access
Oui
Création de la notice
24/01/2008 21:02
Dernière modification de la notice
20/08/2019 16:28
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