Acclimation to salt modifies the activation of several osmotic stress-activated lipid signalling pathways in Chlamydomonas
Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Meijer, Harold J.G. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2017transfer abstract |
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| Schlagwörter: |
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| Umfang: |
9 |
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| Übergeordnetes Werk: |
Enthalten in: β-carotene isolated from the marine red alga, - Kavalappa, Yogendra Prasad ELSEVIER, 2018, the international journal of plant biochemistry and molecular biology : the official journal of the Phytochemical Society of Europe and the Phytochemical Society of North America, New York, NY [u.a.] |
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| Übergeordnetes Werk: |
volume:135 ; year:2017 ; pages:64-72 ; extent:9 |
| Links: |
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| DOI / URN: |
10.1016/j.phytochem.2016.12.014 |
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ELV015592561 |
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| 245 | 1 | 0 | |a Acclimation to salt modifies the activation of several osmotic stress-activated lipid signalling pathways in Chlamydomonas |
| 264 | 1 | |c 2017transfer abstract | |
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| 520 | |a Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. | ||
| 520 | |a Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. | ||
| 650 | 7 | |a Signal transduction |2 Elsevier | |
| 650 | 7 | |a Chlamydomonas moewusii |2 Elsevier | |
| 650 | 7 | |a Chlamydomonadaceae |2 Elsevier | |
| 650 | 7 | |a Phospholipids |2 Elsevier | |
| 650 | 7 | |a Green alga |2 Elsevier | |
| 650 | 7 | |a Acclimation |2 Elsevier | |
| 650 | 7 | |a Osmotic stress |2 Elsevier | |
| 700 | 1 | |a van Himbergen, John A.J. |4 oth | |
| 700 | 1 | |a Musgrave, Alan |4 oth | |
| 700 | 1 | |a Munnik, Teun |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier Science |a Kavalappa, Yogendra Prasad ELSEVIER |t β-carotene isolated from the marine red alga, |d 2018 |d the international journal of plant biochemistry and molecular biology : the official journal of the Phytochemical Society of Europe and the Phytochemical Society of North America |g New York, NY [u.a.] |w (DE-627)ELV001360140 |
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10.1016/j.phytochem.2016.12.014 doi GBVA2017022000024.pica (DE-627)ELV015592561 (ELSEVIER)S0031-9422(16)30299-0 DE-627 ger DE-627 rakwb eng 580 540 580 DE-600 540 DE-600 630 640 610 VZ Meijer, Harold J.G. verfasserin aut Acclimation to salt modifies the activation of several osmotic stress-activated lipid signalling pathways in Chlamydomonas 2017transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. Signal transduction Elsevier Chlamydomonas moewusii Elsevier Chlamydomonadaceae Elsevier Phospholipids Elsevier Green alga Elsevier Acclimation Elsevier Osmotic stress Elsevier van Himbergen, John A.J. oth Musgrave, Alan oth Munnik, Teun oth Enthalten in Elsevier Science Kavalappa, Yogendra Prasad ELSEVIER β-carotene isolated from the marine red alga, 2018 the international journal of plant biochemistry and molecular biology : the official journal of the Phytochemical Society of Europe and the Phytochemical Society of North America New York, NY [u.a.] (DE-627)ELV001360140 volume:135 year:2017 pages:64-72 extent:9 https://doi.org/10.1016/j.phytochem.2016.12.014 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA AR 135 2017 64-72 9 045F 580 |
| spelling |
10.1016/j.phytochem.2016.12.014 doi GBVA2017022000024.pica (DE-627)ELV015592561 (ELSEVIER)S0031-9422(16)30299-0 DE-627 ger DE-627 rakwb eng 580 540 580 DE-600 540 DE-600 630 640 610 VZ Meijer, Harold J.G. verfasserin aut Acclimation to salt modifies the activation of several osmotic stress-activated lipid signalling pathways in Chlamydomonas 2017transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. Signal transduction Elsevier Chlamydomonas moewusii Elsevier Chlamydomonadaceae Elsevier Phospholipids Elsevier Green alga Elsevier Acclimation Elsevier Osmotic stress Elsevier van Himbergen, John A.J. oth Musgrave, Alan oth Munnik, Teun oth Enthalten in Elsevier Science Kavalappa, Yogendra Prasad ELSEVIER β-carotene isolated from the marine red alga, 2018 the international journal of plant biochemistry and molecular biology : the official journal of the Phytochemical Society of Europe and the Phytochemical Society of North America New York, NY [u.a.] (DE-627)ELV001360140 volume:135 year:2017 pages:64-72 extent:9 https://doi.org/10.1016/j.phytochem.2016.12.014 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA AR 135 2017 64-72 9 045F 580 |
| allfields_unstemmed |
10.1016/j.phytochem.2016.12.014 doi GBVA2017022000024.pica (DE-627)ELV015592561 (ELSEVIER)S0031-9422(16)30299-0 DE-627 ger DE-627 rakwb eng 580 540 580 DE-600 540 DE-600 630 640 610 VZ Meijer, Harold J.G. verfasserin aut Acclimation to salt modifies the activation of several osmotic stress-activated lipid signalling pathways in Chlamydomonas 2017transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. Signal transduction Elsevier Chlamydomonas moewusii Elsevier Chlamydomonadaceae Elsevier Phospholipids Elsevier Green alga Elsevier Acclimation Elsevier Osmotic stress Elsevier van Himbergen, John A.J. oth Musgrave, Alan oth Munnik, Teun oth Enthalten in Elsevier Science Kavalappa, Yogendra Prasad ELSEVIER β-carotene isolated from the marine red alga, 2018 the international journal of plant biochemistry and molecular biology : the official journal of the Phytochemical Society of Europe and the Phytochemical Society of North America New York, NY [u.a.] (DE-627)ELV001360140 volume:135 year:2017 pages:64-72 extent:9 https://doi.org/10.1016/j.phytochem.2016.12.014 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA AR 135 2017 64-72 9 045F 580 |
| allfieldsGer |
10.1016/j.phytochem.2016.12.014 doi GBVA2017022000024.pica (DE-627)ELV015592561 (ELSEVIER)S0031-9422(16)30299-0 DE-627 ger DE-627 rakwb eng 580 540 580 DE-600 540 DE-600 630 640 610 VZ Meijer, Harold J.G. verfasserin aut Acclimation to salt modifies the activation of several osmotic stress-activated lipid signalling pathways in Chlamydomonas 2017transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. Signal transduction Elsevier Chlamydomonas moewusii Elsevier Chlamydomonadaceae Elsevier Phospholipids Elsevier Green alga Elsevier Acclimation Elsevier Osmotic stress Elsevier van Himbergen, John A.J. oth Musgrave, Alan oth Munnik, Teun oth Enthalten in Elsevier Science Kavalappa, Yogendra Prasad ELSEVIER β-carotene isolated from the marine red alga, 2018 the international journal of plant biochemistry and molecular biology : the official journal of the Phytochemical Society of Europe and the Phytochemical Society of North America New York, NY [u.a.] (DE-627)ELV001360140 volume:135 year:2017 pages:64-72 extent:9 https://doi.org/10.1016/j.phytochem.2016.12.014 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA AR 135 2017 64-72 9 045F 580 |
| allfieldsSound |
10.1016/j.phytochem.2016.12.014 doi GBVA2017022000024.pica (DE-627)ELV015592561 (ELSEVIER)S0031-9422(16)30299-0 DE-627 ger DE-627 rakwb eng 580 540 580 DE-600 540 DE-600 630 640 610 VZ Meijer, Harold J.G. verfasserin aut Acclimation to salt modifies the activation of several osmotic stress-activated lipid signalling pathways in Chlamydomonas 2017transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. Signal transduction Elsevier Chlamydomonas moewusii Elsevier Chlamydomonadaceae Elsevier Phospholipids Elsevier Green alga Elsevier Acclimation Elsevier Osmotic stress Elsevier van Himbergen, John A.J. oth Musgrave, Alan oth Munnik, Teun oth Enthalten in Elsevier Science Kavalappa, Yogendra Prasad ELSEVIER β-carotene isolated from the marine red alga, 2018 the international journal of plant biochemistry and molecular biology : the official journal of the Phytochemical Society of Europe and the Phytochemical Society of North America New York, NY [u.a.] (DE-627)ELV001360140 volume:135 year:2017 pages:64-72 extent:9 https://doi.org/10.1016/j.phytochem.2016.12.014 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA AR 135 2017 64-72 9 045F 580 |
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Enthalten in β-carotene isolated from the marine red alga, New York, NY [u.a.] volume:135 year:2017 pages:64-72 extent:9 |
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Acclimation to salt modifies the activation of several osmotic stress-activated lipid signalling pathways in Chlamydomonas |
| abstract |
Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. |
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Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. |
| abstract_unstemmed |
Osmotic stress rapidly activates several phospholipid signalling pathways in the unicellular alga Chlamydomonas. In this report, we have studied the effects of salt-acclimation on growth and phospholipid signalling. Growing cells on media containing 100 mM NaCl increased their salt-tolerance but did not affect the overall phospholipid content, except that levels of phosphatidylinositol phosphate (PIP) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] were reduced by one-third. When these NaCl-acclimated cells were treated with increasing concentrations of salt, the same lipid signalling pathways as in non-acclimated cells were activated. This was witnessed as increases in phosphatidic acid (PA), lyso-phosphatidic acid (L-PA), diacylglycerol pyrophosphate (DGPP), PI(4,5)P2 and its isomer PI(3,5)P2. However, all dose-dependent responses were shifted to higher osmotic-stress levels, and the responses were lower than in non-acclimated cells. When NaCl-acclimated cells were treated with other osmotica, such as KCl and sucrose, the same effects were found, illustrating that they were due to hyperosmotic rather than hyperionic acclimation. The results indicate that acclimation to moderate salt stress modifies stress perception and the activation of several downstream pathways. |
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