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    • 2005 6
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Publications

Danon, A.; Miersch, O.; Felix, G.; op den Camp, R. G. L.; Apel, K.; Concurrent activation of cell death-regulating signaling pathways by singlet oxygen in Arabidopsis thaliana Plant J. 41 68-80 (2005) DOI: 10.1111/j.1365-313X.2004.02276.x
  • Abstract
  • BibText
  • RIS

Upon a dark/light shift the conditional flu mutant of Arabidopsis starts to generate singlet oxygen (1O2), a non‐radical reactive oxygen species that is restricted to the plastid compartment. Immediately after the shift, plants stop growing and develop necrotic lesions. We have established a protoplast system, which allows detection and characterization of the death response in flu induced by the release of 1O2. Vitamin B6 that quenches 1O2 in fungi was able to protect flu protoplasts from cell death. Blocking ethylene production was sufficient to partially inhibit the death reaction. Similarly, flu mutant seedlings expressing transgenic NahG were partially protected from the death provoked by the release of 1O2, indicating a requirement for salicylic acid (SA) in this process, whereas in cells depleted of both, ethylene and SA, the extent of cell death was reduced to the wild‐type level. The flu mutant was also crossed with the jasmonic acid (JA)‐depleted mutant opr3 , and with the JA, OPDA and dinor OPDA (dnOPDA)‐depleted dde2‐2 mutant. Analysis of the resulting double mutants revealed that in contrast to the JA‐induced suppression of H2O2/superoxide‐dependent cell death reported earlier, JA promotes singlet oxygen‐mediated cell death in flu , whereas other oxylipins such as OPDA and dnOPDA antagonize this death‐inducing activity of JA.

Publications

Ludwig, A. A.; Saitoh, H.; Felix, G.; Freymark, G.; Miersch, O.; Wasternack, C.; Boller, T.; Jones, J. D. G.; Romeis, T.; Ethylene-mediated cross-talk between calcium-dependent protein kinase and MAPK signaling controls stress responses in plants Proc. Natl. Acad. Sci. U.S.A. 102 10736-10741 (2005) DOI: 10.1073/pnas.0502954102
  • Abstract
  • BibText
  • RIS

Plants are constantly exposed to environmental changes and need to integrate multiple external stress cues. Calcium-dependent protein kinases (CDPKs) are implicated as major primary Ca2+ sensors in plants. CDPK activation, like activation of mitogen-activated protein kinases (MAPKs), is triggered by biotic and abiotic stresses, although distinct stimulus-specific stress responses are induced. To investigate whether CDPKs are part of an underlying mechanism to guarantee response specificity, we identified CDPK-controlled signaling pathways. A truncated form of Nicotiana tabacum CDPK2 lacking its regulatory autoinhibitor and calcium-binding domains was ectopically expressed in Nicotiana benthamiana. Infiltrated leaves responded to an abiotic stress stimulus with the activation of biotic stress reactions. These responses included synthesis of reactive oxygen species, defense gene induction, and SGT1-dependent cell death. Furthermore, N-terminal CDPK2 signaling triggered enhanced levels of the phytohormones jasmonic acid, 12-oxo-phytodienoic acid, and ethylene but not salicylic acid. These responses, commonly only observed after challenge with a strong biotic stimulus, were prevented when the CDPK's intrinsic autoinhibitory peptide was coexpressed. Remarkably, elevated CDPK signaling compromised stress-induced MAPK activation, and this inhibition required ethylene synthesis and perception. These data indicate that CDPK and MAPK pathways do not function independently and that a concerted activation of both pathways controls response specificity to biotic and abiotic stress.

Publications

Danon, A.; Miersch, O.; Felix, G.; op den Camp, R. G. L.; Apel, K.; Concurrent activation of cell death-regulating signaling pathways by singlet oxygen in Arabidopsis thaliana Plant J. 41 68-80 (2005) DOI: 10.1111/j.1365-313X.2004.02276.x
  • Abstract
  • BibText
  • RIS

Upon a dark/light shift the conditional flu mutant of Arabidopsis starts to generate singlet oxygen (1O2), a non‐radical reactive oxygen species that is restricted to the plastid compartment. Immediately after the shift, plants stop growing and develop necrotic lesions. We have established a protoplast system, which allows detection and characterization of the death response in flu induced by the release of 1O2. Vitamin B6 that quenches 1O2 in fungi was able to protect flu protoplasts from cell death. Blocking ethylene production was sufficient to partially inhibit the death reaction. Similarly, flu mutant seedlings expressing transgenic NahG were partially protected from the death provoked by the release of 1O2, indicating a requirement for salicylic acid (SA) in this process, whereas in cells depleted of both, ethylene and SA, the extent of cell death was reduced to the wild‐type level. The flu mutant was also crossed with the jasmonic acid (JA)‐depleted mutant opr3 , and with the JA, OPDA and dinor OPDA (dnOPDA)‐depleted dde2‐2 mutant. Analysis of the resulting double mutants revealed that in contrast to the JA‐induced suppression of H2O2/superoxide‐dependent cell death reported earlier, JA promotes singlet oxygen‐mediated cell death in flu , whereas other oxylipins such as OPDA and dnOPDA antagonize this death‐inducing activity of JA.

Publications

Ludwig, A. A.; Saitoh, H.; Felix, G.; Freymark, G.; Miersch, O.; Wasternack, C.; Boller, T.; Jones, J. D. G.; Romeis, T.; Ethylene-mediated cross-talk between calcium-dependent protein kinase and MAPK signaling controls stress responses in plants Proc. Natl. Acad. Sci. U.S.A. 102 10736-10741 (2005) DOI: 10.1073/pnas.0502954102
  • Abstract
  • BibText
  • RIS

Plants are constantly exposed to environmental changes and need to integrate multiple external stress cues. Calcium-dependent protein kinases (CDPKs) are implicated as major primary Ca2+ sensors in plants. CDPK activation, like activation of mitogen-activated protein kinases (MAPKs), is triggered by biotic and abiotic stresses, although distinct stimulus-specific stress responses are induced. To investigate whether CDPKs are part of an underlying mechanism to guarantee response specificity, we identified CDPK-controlled signaling pathways. A truncated form of Nicotiana tabacum CDPK2 lacking its regulatory autoinhibitor and calcium-binding domains was ectopically expressed in Nicotiana benthamiana. Infiltrated leaves responded to an abiotic stress stimulus with the activation of biotic stress reactions. These responses included synthesis of reactive oxygen species, defense gene induction, and SGT1-dependent cell death. Furthermore, N-terminal CDPK2 signaling triggered enhanced levels of the phytohormones jasmonic acid, 12-oxo-phytodienoic acid, and ethylene but not salicylic acid. These responses, commonly only observed after challenge with a strong biotic stimulus, were prevented when the CDPK's intrinsic autoinhibitory peptide was coexpressed. Remarkably, elevated CDPK signaling compromised stress-induced MAPK activation, and this inhibition required ethylene synthesis and perception. These data indicate that CDPK and MAPK pathways do not function independently and that a concerted activation of both pathways controls response specificity to biotic and abiotic stress.

Publications

Ludwig, A. A.; Saitoh, H.; Felix, G.; Freymark, G.; Miersch, O.; Wasternack, C.; Boller, T.; Jones, J. D. G.; Romeis, T.; Ethylene-mediated cross-talk between calcium-dependent protein kinase and MAPK signaling controls stress responses in plants Proc. Natl. Acad. Sci. U.S.A. 102 10736-10741 (2005) DOI: 10.1073/pnas.0502954102
  • Abstract
  • BibText
  • RIS

Plants are constantly exposed to environmental changes and need to integrate multiple external stress cues. Calcium-dependent protein kinases (CDPKs) are implicated as major primary Ca2+ sensors in plants. CDPK activation, like activation of mitogen-activated protein kinases (MAPKs), is triggered by biotic and abiotic stresses, although distinct stimulus-specific stress responses are induced. To investigate whether CDPKs are part of an underlying mechanism to guarantee response specificity, we identified CDPK-controlled signaling pathways. A truncated form of Nicotiana tabacum CDPK2 lacking its regulatory autoinhibitor and calcium-binding domains was ectopically expressed in Nicotiana benthamiana. Infiltrated leaves responded to an abiotic stress stimulus with the activation of biotic stress reactions. These responses included synthesis of reactive oxygen species, defense gene induction, and SGT1-dependent cell death. Furthermore, N-terminal CDPK2 signaling triggered enhanced levels of the phytohormones jasmonic acid, 12-oxo-phytodienoic acid, and ethylene but not salicylic acid. These responses, commonly only observed after challenge with a strong biotic stimulus, were prevented when the CDPK's intrinsic autoinhibitory peptide was coexpressed. Remarkably, elevated CDPK signaling compromised stress-induced MAPK activation, and this inhibition required ethylene synthesis and perception. These data indicate that CDPK and MAPK pathways do not function independently and that a concerted activation of both pathways controls response specificity to biotic and abiotic stress.

Publications

Danon, A.; Miersch, O.; Felix, G.; op den Camp, R. G. L.; Apel, K.; Concurrent activation of cell death-regulating signaling pathways by singlet oxygen in Arabidopsis thaliana Plant J. 41 68-80 (2005) DOI: 10.1111/j.1365-313X.2004.02276.x
  • Abstract
  • BibText
  • RIS

Upon a dark/light shift the conditional flu mutant of Arabidopsis starts to generate singlet oxygen (1O2), a non‐radical reactive oxygen species that is restricted to the plastid compartment. Immediately after the shift, plants stop growing and develop necrotic lesions. We have established a protoplast system, which allows detection and characterization of the death response in flu induced by the release of 1O2. Vitamin B6 that quenches 1O2 in fungi was able to protect flu protoplasts from cell death. Blocking ethylene production was sufficient to partially inhibit the death reaction. Similarly, flu mutant seedlings expressing transgenic NahG were partially protected from the death provoked by the release of 1O2, indicating a requirement for salicylic acid (SA) in this process, whereas in cells depleted of both, ethylene and SA, the extent of cell death was reduced to the wild‐type level. The flu mutant was also crossed with the jasmonic acid (JA)‐depleted mutant opr3 , and with the JA, OPDA and dinor OPDA (dnOPDA)‐depleted dde2‐2 mutant. Analysis of the resulting double mutants revealed that in contrast to the JA‐induced suppression of H2O2/superoxide‐dependent cell death reported earlier, JA promotes singlet oxygen‐mediated cell death in flu , whereas other oxylipins such as OPDA and dnOPDA antagonize this death‐inducing activity of JA.

  • 1

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