Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient.

MIGUEL VILUMBRALES, David, Kateřina SKÁCELOVÁ and Miloš BARTÁK. Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient. (Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient). Czech Polar Reports. Brno: Masarykova univerzita, 2013, vol. 3, No 2, p. 163 - 172. ISSN 1805-0689. Available from: https://dx.doi.org/10.5817/CPR2013-2-17.

Basic information

• Original name: Sensitivity of Antarctic freshwater algae to salt stress assessed by fast chlorophyll fluorescence transient.
• Name in Czech: Senzitivita antarktických sladkovodních řas vůči stresu solí posouzená metodou rychlé indukční kinetiky fluorescence chlorofylu.
• Authors: MIGUEL VILUMBRALES, David (724 Spain, belonging to the institution), Kateřina SKÁCELOVÁ (203 Czech Republic, belonging to the institution) and Miloš BARTÁK (203 Czech Republic, guarantor, belonging to the institution).
• Edition: Czech Polar Reports, Brno, Masarykova univerzita, 2013, 1805-0689.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10600 1.6 Biological sciences
• Country of publisher: Czech Republic
• Confidentiality degree: is not subject to a state or trade secret
• WWW: stránka časopisu CZECH POLAR REPORTS
• RIV identification code: RIV/00216224:14310/13:00070542
• Organization unit: Faculty of Science
• Doi: http://dx.doi.org/10.5817/CPR2013-2-17
• Keywords (in Czech): Klebsormidium Zygnema OJIP fotosyntéza ostrov Jamese Rosse jezero Monolith
• Keywords in English: Klebsormidium sp. Zygnema sp. OJIP photosynthesis James Ross Island Monolith Lake
• Tags: AKR, rivok
• Tags: International impact, Reviewed

Abstract

In this study, we investigated the effects of salt stress (2 mM NaCl) on excitation energy transfer from light harvesting complexes to photosystem II (PS II) in two Antarctic algal species: Klebsormidium sp. and Zygnema sp. Short-term salt stress led to a significant changes in the shape of chlorophyll fluorescence transient (OJIP). Analyses of the polyphasic fluorescence transients (OJIP) showed that the fluorescence yield at the phases J, I and P declined considerably with the time of exposition to salt stress. In both experimental species, OJIP transients reached lowest values of chlorophyll fluorescence signal after 30/60 min. of NaCl exposition. Then, OJIP shape and chlorophyll fluo- rescence showed species-specific recovery and rised towards original values (about 2/3 of untreated control). Analyses of chlorophyll fluorescence parameters derived from OJIPs showed that salt stress led to a decrease in the maximal efficiency of PS II photo- chemistry (FV/FM) in Zygnema sp. but not Klebsormidium sp. The results indicated that the probability of excitation energy transfer before and beyond QA, and the yield of electron transport beyond QA is limited by salt-induced stress in Zygnema sp. In addition, salt stress resulted in a decrease in the photosynthetic electron transport per PS II reaction center, but both increase and decrease in the trapping per PS II reaction center was found. Performace index (PIabs) was affected negatively in Zygnema sp. but possitively Klebsormidium sp. indicating that the latter species was more resistant to salt stress than Zygnema sp.

Abstract (in Czech)

Stres solí byl posuzován pomocí rychlé indukční kinetiky fluorescence chlorofylu OJIP. Bylo uskutečněno mezidruhové srovnání mezi řasami Zygnema sp. a Klebsormidium sp.

Links

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