scholarly journals The expression pattern of the Picea glauca Defensin 1 promoter is maintained in Arabidopsis thaliana, indicating the conservation of signalling pathways between angiosperms and gymnosperms*

2011 ◽  
Vol 63 (2) ◽  
pp. 785-795 ◽  
Author(s):  
Hugo Germain ◽  
Denis Lachance ◽  
Gervais Pelletier ◽  
Carl Gunnar Fossdal ◽  
Halvor Solheim ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Expression Pattern ◽  
Picea Glauca ◽  
Signalling Pathways

The members of Arabidopsis thaliana PAO gene family exhibit distinct tissue- and organ-specific expression pattern during seedling growth and flower development

Amino Acids ◽  
2011 ◽  
Vol 42 (2-3) ◽  
pp. 831-841 ◽  
Author(s):  
Paola Fincato ◽  
Panagiotis N. Moschou ◽  
Abdellah Ahou ◽  
Riccardo Angelini ◽  
Kalliopi A. Roubelakis-Angelakis ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Gene Family ◽  
Expression Pattern ◽  
Seedling Growth ◽  
Flower Development ◽  
Specific Expression ◽  
Organ Specific ◽  
Organ Specific Expression ◽  
Specific Expression Pattern

Expression pattern of genes encoding nitrate and ammonium assimilating enzymes in Arabidopsis thaliana exposed to short term NaCl stress

2013 ◽  
Vol 170 (2) ◽  
pp. 155-160 ◽  
Author(s):  
Mohamed Debouba ◽  
Houda Maaroufi Dguimi ◽  
Mohamed Ghorbel ◽  
Houda Gouia ◽  
Akira Suzuki
Keyword(s):  
Arabidopsis Thaliana ◽  
Expression Pattern ◽  
Nacl Stress ◽  
Short Term ◽  
Genes Encoding

scholarly journals Kinetics of retrograde signalling initiation in the high light response of Arabidopsis thaliana

2014 ◽  
Vol 369 (1640) ◽  
pp. 20130424 ◽  
Author(s):  
Khalid Alsharafa ◽  
Marc Oliver Vogel ◽  
Marie-Luise Oelze ◽  
Marten Moore ◽  
Nadja Stingl ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Nuclear Gene ◽  
Light Response ◽  
High Light ◽  
Time Dependent ◽  
Signalling Pathways ◽  
Minor Role ◽  
Intensity Increase ◽  
Normal Light ◽  
Set Up

High light acclimation depends on retrograde control of nuclear gene expression. Retrograde regulation uses multiple signalling pathways and thus exploits signal patterns. To maximally challenge the acclimation system, Arabidopsis thaliana plants were either adapted to 8 (low light (L-light)) or 80 µmol quanta m −2 s −1 (normal light (N-light)) and subsequently exposed to a 100- and 10-fold light intensity increase, respectively, to high light (H-light, 800 µmol quanta m −2 s −1 ), for up to 6 h. Both L → H- and N → H-light plants efficiently regulated CO 2 assimilation to a constant level without apparent damage and inhibition. This experimental set-up was scrutinized for time-dependent regulation and efficiency of adjustment. Transcriptome profiles revealed that N-light and L-light plants differentially accumulated 2119 transcripts. After 6 h in H-light, only 205 remained differently regulated between the L → H- and N → H-light plants, indicating efficient regulation allowing the plants to reach a similar transcriptome state. Time-dependent analysis of transcripts as markers for signalling pathways, and of metabolites and hormones as possibly involved transmitters, suggests that oxylipins such as oxophytodienoic acid and jasmonic acid, metabolites and redox cues predominantly control the acclimation response, whereas abscisic acid, salicylic acid and auxins play an insignificant or minor role.

scholarly journals AtRsgA from Arabidopsis thaliana controls maturation of the small subunit of the chloroplast ribosome

2017 ◽  
Author(s):  
Marcin Janowski ◽  
Reimo Zoschke ◽  
Lars Scharff ◽  
Silvia Martinez Jaime ◽  
Camilla Ferrari ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Proteomic Analysis ◽  
Ribosome Biogenesis ◽  
Functional Characterization ◽  
Small Subunit ◽  
Signalling Pathways ◽  
Compensatory Mechanism ◽  
Transcriptional Responses ◽  
Retrograde Signalling ◽  
Assembly Factor

SummaryPlastid ribosomes are very similar in structure and function to ribosomes of their bacterial ancestors. Since ribosome biogenesis is not thermodynamically favourable at biological conditions, it requires activity of many assembly factors. Here, we have characterized a homolog of bacterial rsgA in Arabidopsis thaliana and show that it can complement the bacterial homolog. Functional characterization of a strong mutant in Arabidopsis revealed that the protein is essential for plant viability, while a weak mutant produced dwarf, chlorotic plants that incorporated immature pre-16S ribosomal RNA into translating ribosomes. Physiological analysis of the mutant plants revealed smaller, but more numerous chloroplasts in the mesophyll cells, reduction of chlorophyll a and b, depletion of proplastids from the rib meristem and decreased photosynthetic electron transport rate and efficiency. Comparative RNA-sequencing and proteomic analysis of the weak mutant and wild-type plants revealed that various biotic stress-related, transcriptional regulation and post-transcriptional modification pathways were repressed in the mutant. Intriguingly, while nuclear- and chloroplast-encoded photosynthesis-related proteins were less abundant in the mutant, the corresponding transcripts were upregulated, suggesting an elaborate compensatory mechanism, potentially via differentially active retrograde signalling pathways. To conclude, this study reveals a new chloroplast ribosome assembly factor and outlines the transcriptomic and proteomic responses of the compensatory mechanism activated during decreased chloroplast function.Significance statementAtRsgA is an assembly factor necessary for maturation of the small subunit of the chloroplast ribosome. Depletion of AtRsgA leads to dwarfed, chlorotic plants and smaller, but more numerous chloroplasts. Large-scale transcriptomic and proteomic analysis revealed that chloroplast-encoded and - targeted proteins were less abundant, while the corresponding transcripts were upregulated in the mutant. We analyse the transcriptional responses of several retrograde signalling pathways to suggest a mechanism underlying this compensatory response.

Interaction of stomatal responses to ABA and CO2 in Arabidopsis thaliana

1998 ◽  
Vol 25 (7) ◽  
pp. 785 ◽  
Author(s):  
Juliette Leymarie ◽  
Gérard Lascève ◽  
Alain Vavasseur
Keyword(s):  
Arabidopsis Thaliana ◽  
Leaf Conductance ◽  
Signalling Pathways ◽  
Co2 Removal ◽  
Wild Type ◽  
Stomatal Responses ◽  
Whole Plant ◽  
Aba Insensitive ◽  
Rapid Drop

Stomatal responses to ABA and CO2 were investigated in Arabidopsis thaliana (L.) Heynh. wild-type and ABA insensitive mutants (abi1-1, abi2-1, abi1-1abi2-1) at the whole plant and at the isolated epidermis levels. In wild-type plants, feeding roots with ABA (1–50 µM) triggered a rapid drop in leaf conductance which levelled off during the following photoperiods, and strongly inhibited the increase in conductance induced by light. The rapid response was strongly inhibited in abi1-1, abi2-1 and abi1-1abi2-1 double mutants, but a residual long-term decrease in leaf conductance was still observed. In wild-type plants, exogenous ABA strongly enhanced the response to CO2 removal. Conversely, in the absence of CO2 the effect of ABA was drastically reduced in epidermal strip experiments. These results reveal a strong interaction between sensing of ABA and CO2 in stomata of A. thaliana. Despite an initially wide stomatal aperture in abi-1, abi-2 and double mutant plants, their stomatal responses to light and CO2 removal were half those of wild-type plants. Moreover these responses were totally independent of the presence of ABA, suggesting that ABI1 and ABI2 are either directly involved in the interaction between the two signalling pathways or, alternatively located upstream of this point of interaction.

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