TY  - JOUR
A1  - Karimi, Sohail M.
A1  - Freund, Matthias
A1  - Wager, Brittney M.
A1  - Knoblauch, Michael
A1  - Fromm, Jörg
A1  - M. Mueller, Heike
A1  - Ache, Peter
A1  - Krischke, Markus
A1  - Mueller, Martin J.
A1  - Müller, Tobias
A1  - Dittrich, Marcus
A1  - Geilfus, Christoph-Martin
A1  - Alfaran, Ahmed H.
A1  - Hedrich, Rainer
A1  - Deeken, Rosalia
T1  - Under salt stress guard cells rewire ion transport and abscisic acid signaling
JF  - New Phytologist
N2  - Soil salinity is an increasingly global problem which hampers plant growth and crop yield. Plant productivity depends on optimal water-use efficiency and photosynthetic capacity balanced by stomatal conductance. Whether and how stomatal behavior contributes to salt sensitivity or tolerance is currently unknown. This work identifies guard cell-specific signaling networks exerted by a salt-sensitive and salt-tolerant plant under ionic and osmotic stress conditions accompanied by increasing NaCl loads.
We challenged soil-grown Arabidopsis thaliana and Thellungiella salsuginea plants with short- and long-term salinity stress and monitored genome-wide gene expression and signals of guard cells that determine their function.
Arabidopsis plants suffered from both salt regimes and showed reduced stomatal conductance while Thellungiella displayed no obvious stress symptoms. The salt-dependent gene expression changes of guard cells supported the ability of the halophyte to maintain high potassium to sodium ratios and to attenuate the abscisic acid (ABA) signaling pathway which the glycophyte kept activated despite fading ABA concentrations.
Our study shows that salinity stress and even the different tolerances are manifested on a single cell level. Halophytic guard cells are less sensitive than glycophytic guard cells, providing opportunities to manipulate stomatal behavior and improve plant productivity.
KW  - soil
KW  - stomata
KW  - abscisic acid (ABA)
KW  - glycophyte Arabidopsis
KW  - guard cell
KW  - halophyte Thellungiella/Eutrema
KW  - ion transport
KW  - salt stress
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-259635
VL  - 231
IS  - 3
ER  - 
TY  - JOUR
A1  - Ghirardo, Andrea
A1  - Nosenko, Tetyana
A1  - Kreuzwieser, Jürgen
A1  - Winkler, J. Barbro
A1  - Kruse, Jörg
A1  - Albert, Andreas
A1  - Merl-Pham, Juliane
A1  - Lux, Thomas
A1  - Ache, Peter
A1  - Zimmer, Ina
A1  - Alfarraj, Saleh
A1  - Mayer, Klaus F. X.
A1  - Hedrich, Rainer
A1  - Rennenberg, Heinz
A1  - Schnitzler, Jörg-Peter
T1  - Protein expression plasticity contributes to heat and drought tolerance of date palm
JF  - Oecologia
N2  - Climate change is increasing the frequency and intensity of warming and drought periods around the globe, currently representing a threat to many plant species. Understanding the resistance and resilience of plants to climate change is, therefore, urgently needed. As date palm (Phoenix dactylifera) evolved adaptation mechanisms to a xeric environment and can tolerate large diurnal and seasonal temperature fluctuations, we studied the protein expression changes in leaves, volatile organic compound emissions, and photosynthesis in response to variable growth temperatures and soil water deprivation. Plants were grown under controlled environmental conditions of simulated Saudi Arabian summer and winter climates challenged with drought stress. We show that date palm is able to counteract the harsh conditions of the Arabian Peninsula by adjusting the abundances of proteins related to the photosynthetic machinery, abiotic stress and secondary metabolism. Under summer climate and water deprivation, these adjustments included efficient protein expression response mediated by heat shock proteins and the antioxidant system to counteract reactive oxygen species formation. Proteins related to secondary metabolism were downregulated, except for the P. dactylifera isoprene synthase (PdIspS), which was strongly upregulated in response to summer climate and drought. This study reports, for the first time, the identification and functional characterization of the gene encoding for PdIspS, allowing future analysis of isoprene functions in date palm under extreme environments. Overall, the current study shows that reprogramming of the leaf protein profiles confers the date palm heat- and drought tolerance. We conclude that the protein plasticity of date palm is an important mechanism of molecular adaptation to environmental fluctuations.
KW  - abiotic stress
KW  - isoprene
KW  - proteomics
KW  - photosynthesis
KW  - Phoenix dactylifera
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-308075
SN  - 0029-8549
SN  - 1432-1939
VL  - 197
IS  - 4
ER  -