TY  - JOUR
A1  - Bemm, Felix
A1  - Becker, Dirk
A1  - Larisch, Christina
A1  - Kreuzer, Ines
A1  - Escalante-Perez, Maria
A1  - Schulze, Waltraud X.
A1  - Ankenbrand, Markus
A1  - Van de Weyer, Anna-Lena
A1  - Krol, Elzbieta
A1  - Al-Rasheid, Khaled A.
A1  - Mithöfer, Axel
A1  - Weber, Andreas P.
A1  - Schultz, Jörg
A1  - Hedrich, Rainer
T1  - Venus flytrap carnivorous lifestyle builds on herbivore defense strategies
JF  - Genome Research
N2  - Although the concept of botanical carnivory has been known since Darwin's time, the molecular mechanisms that allow animal feeding remain unknown, primarily due to a complete lack of genomic information. Here, we show that the transcriptomic landscape of the Dionaea trap is dramatically shifted toward signal transduction and nutrient transport upon insect feeding, with touch hormone signaling and protein secretion prevailing. At the same time, a massive induction of general defense responses is accompanied by the repression of cell death-related genes/processes. We hypothesize that the carnivory syndrome of Dionaea evolved by exaptation of ancient defense pathways, replacing cell death with nutrient acquisition.
KW  - Dionaea-muscipula ellis
KW  - Plant utricularia-gibba
KW  - Programmed cell-death
KW  - Genomics data sets
KW  - RNA-SEQ data
KW  - Arabidopsis-thaliana
KW  - Jasmonate perception
KW  - Action potentials
KW  - Stress responses
KW  - Wonderful plants
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-188799
VL  - 26
IS  - 6
ER  - 
TY  - JOUR
A1  - Scherzer, Sönke
A1  - Huang, Shouguang
A1  - Iosip, Anda
A1  - Kreuzer, Ines
A1  - Yokawa, Ken
A1  - Al-Rasheid, Khaled A. S.
A1  - Heckmann, Manfred
A1  - Hedrich, Rainer
T1  - Ether anesthetics prevents touch-induced trigger hair calcium-electrical signals excite the Venus flytrap
JF  - Scientific reports
N2  - Plants do not have neurons but operate transmembrane ion channels and can get electrical excited by physical and chemical clues. Among them the Venus flytrap is characterized by its peculiar hapto-electric signaling. When insects collide with trigger hairs emerging the trap inner surface, the mechanical stimulus within the mechanosensory organ is translated into a calcium signal and an action potential (AP). Here we asked how the Ca\(^{2+}\) wave and AP is initiated in the trigger hair and how it is feed into systemic trap calcium-electrical networks. When Dionaea muscipula trigger hairs matures and develop hapto-electric excitability the mechanosensitive anion channel DmMSL10/FLYC1 and voltage dependent SKOR type Shaker K\(^{+}\) channel are expressed in the sheering stress sensitive podium. The podium of the trigger hair is interface to the flytrap’s prey capture and processing networks. In the excitable state touch stimulation of the trigger hair evokes a rise in the podium Ca2+ first and before the calcium signal together with an action potential travel all over the trap surface. In search for podium ion channels and pumps mediating touch induced Ca\(^{2+}\) transients, we, in mature trigger hairs firing fast Ca\(^{2+}\) signals and APs, found OSCA1.7 and GLR3.6 type Ca\(^{2+}\) channels and ACA2/10 Ca\(^{2+}\) pumps specifically expressed in the podium. Like trigger hair stimulation, glutamate application to the trap directly evoked a propagating Ca\(^{2+}\) and electrical event. Given that anesthetics affect K\(^+\) channels and glutamate receptors in the animal system we exposed flytraps to an ether atmosphere. As result propagation of touch and glutamate induced Ca\(^{2+}\) and AP long-distance signaling got suppressed, while the trap completely recovered excitability when ether was replaced by fresh air. In line with ether targeting a calcium channel addressing a Ca\(^{2+}\) activated anion channel the AP amplitude declined before the electrical signal ceased completely. Ether in the mechanosensory organ did neither prevent the touch induction of a calcium signal nor this post stimulus decay. This finding indicates that ether prevents the touch activated, glr3.6 expressing base of the trigger hair to excite the capture organ.
KW  - biophysics
KW  - drug discovery
KW  - physiology
KW  - plan sciences
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-300411
VL  - 12
ER  -