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Aurelio Gomezcadenas – 1st expert on this subject based on the ideXlab platform
common and divergent physiological hormonal and metabolic responses of Arabidopsis thaliana and thellungiella halophila to water and salt stressJournal of Plant Physiology, 2010Co-Authors: Vicent Arbona, Rosa Argamasilla, Aurelio GomezcadenasAbstract:
Abstract To explain the higher tolerance of Thellungiella to abiotic stress in comparison to Arabidopsis, several studies have focused on differences in ion absorption and gene expression. However, little is known about hormone regulation and metabolic responses. In this work, plants of both species were subjected to desiccation and salt stress to compare common and divergent responses. In control conditions, the number of significantly upregulated mass features as well as proline levels was higher in Tellungiella than in Arabidopsis. When subjected to desiccation, both species exhibited similar rates of water loss but proline over accumulation only occurred in Thellungiella; both species accumulated ABA and JA with a similar trend although Arabidopsis showed higher concentrations of both hormones which indicated a stronger impact of desiccation on Arabidopsis. However, Arabidopsis showed a higher number of significantly altered mass features than Thellungiella. Under salt stress, Thellungiella plants accumulated lower amounts of Cl− ions than Arabidopsis but exhibited a similar proline response. Under these conditions, ABA and JA levels increased in Arabidopsis whereas minimal changes in both hormone concentrations were recorded in Thellungiella. Contrastingly, the impact of salt stress on metabolite profiles was higher in Thellungiella than in Arabidopsis. Overall, data indicated that physiological responses in Arabidopsis are induced after stress imposition through hormonal regulation whereas Thellungiella has a basal metabolic configuration, better prepared to endure environmental cues.
Dirk K. Hincha – 2nd expert on this subject based on the ideXlab platform
Global changes in gene expression, assayed by microarray hybridization and quantitative RT-PCR, during acclimation of three Arabidopsis thaliana accessions to sub-zero temperatures after cold acclimationPlant Molecular Biology, 2015Co-Authors: Mai Q. Le, Majken Pagter, Dirk K. HinchaAbstract:
During cold acclimation plants increase in freezing tolerance in response to low non-freezing temperatures. This is accompanied by many physiological, biochemical and molecular changes that have been extensively investigated. In addition, plants of many species, including Arabidopsis thaliana , become more freezing tolerant during exposure to mild, non-damaging sub-zero temperatures after cold acclimation. There is hardly any information available about the molecular basis of this adaptation. Here, we have used microarrays and a qRT-PCR primer platform covering 1,880 genes encoding transcription factors (TFs) to monitor changes in gene expression in the Arabidopsi s accessions Columbia-0, Rschew and Tenela during the first 3 days of sub-zero acclimation at −3 °C. The results indicate that gene expression during sub-zero acclimation follows a tighly controlled time-course. Especially AP2/EREBP and WRKY TFs may be important regulators of sub-zero acclimation, although the CBF signal transduction pathway seems to be less important during sub-zero than during cold acclimation. Globally, we estimate that approximately 5 % of all Arabidopsis genes are regulated during sub-zero acclimation. Particularly photosynthesis-related genes are down-regulated and genes belonging to the functional classes of cell wall biosynthesis, hormone metabolism and RNA regulation of transcription are up-regulated. Collectively, these data provide the first global analysis of gene expression during sub-zero acclimation and allow the identification of candidate genes for forward and reverse genetic studies into the molecular mechanisms of sub-zero acclimation.
comparison of freezing tolerance compatible solutes and polyamines in geographically diverse collections of thellungiella sp and Arabidopsis thaliana accessionsBMC Plant Biology, 2012Co-Authors: Alexei Babakov, Bert De Boer, Ellen Zuther, Dirk K. HinchaAbstract:
Thellungiella has been proposed as an extremophile alternative to Arabidopsis to investigate environmental stress tolerance. However, Arabidopsis accessions show large natural variation in their freezing tolerance and here the tolerance ranges of collections of accessions in the two species were compared. Leaf freezing tolerance of 16 Thellungiella accessions was assessed with an electrolyte leakage assay before and after 14 days of cold acclimation at 4°C. Soluble sugars (glucose, fructose, sucrose, raffinose) and free polyamines (putrescine, spermidine, spermine) were quantified by HPLC, proline photometrically. The ranges in nonacclimated freezing tolerance completely overlapped between Arabidopsis and Thellungiella. After cold acclimation, some Thellungiella accessions were more freezing tolerant than any Arabidopsis accessions. Acclimated freezing tolerance was correlated with sucrose levels in both species, but raffinose accumulation was lower in Thellungiella and only correlated with freezing tolerance in Arabidopsis. The reverse was true for leaf proline contents. Polyamine levels were generally similar between the species. Only spermine content was higher in nonacclimated Thellungiella plants, but decreased during acclimation and was negatively correlated with freezing tolerance. Thellungiella is not an extremophile with regard to freezing tolerance, but some accessions significantly expand the range present in Arabidopsis. The metabolite data indicate different metabolic adaptation strategies between the species.
Frana Ois Bouteau – 3rd expert on this subject based on the ideXlab platform
could farp like peptides participate in regulation of hyperosmotic stress responses in plantsFrontiers in Endocrinology, 2014Co-Authors: Frana Ois Bouteau, Yann Bassaglia, Emanuela Monetti, Daniel Tran, Sandra Navet, Stefano Mancuso, Hayat ElmaaroufbouteauAbstract:
The ability to respond to hyperosmotic stress is one of numerous conserved cellular processes that most of the organisms have to face during their life. In metazoans, some peptides belonging to the FMRFamide-like peptide (FLP) family were shown to participate to osmoregulation via regulation of ion channels; this is, a well-known response to hyperosmotic stress in plants. Thus, we explored whether FLPs exist and regulate osmotic stress in plants. First, we demonstrated the response of Arabidopsis thaliana cultured cells to a metazoan FLP (FLRF). We found that Arabidopis thaliana express genes that display typical FLP repeated sequences, which end in RF and are surrounded by K or R, which is typical of cleavage sites and suggests bioactivity; however, the terminal G, allowing an amidation process in metazoan, seems to be replaced by W. Using synthetic peptides, we showed that amidation appears unnecessary to bioactivity in A. thaliana, and we provide evidence that these putative FLPs could be involved in physiological processes related to hyperosmotic stress responses in plants, urging further studies on this topic.