Optima and limits of primary photosynthetic production of three lichen phycobionts of the genus Trebouxia

VÁCZI, Peter and Miloš BARTÁK. Optima and limits of primary photosynthetic production of three lichen phycobionts of the genus Trebouxia. Phycologia. Lawrence: International Phycological Society, 2009, vol. 48, No 4, p. 135-136. ISSN 0031-8884.

Basic information

• Original name: Optima and limits of primary photosynthetic production of three lichen phycobionts of the genus Trebouxia
• Name in Czech: Optima a limity primární fotosyntetické produkce tří lišejníkových fykobiontů z rodu Trebouxia
• Authors: VÁCZI, Peter (203 Czech Republic, guarantor) and Miloš BARTÁK (203 Czech Republic).
• Edition: Phycologia, Lawrence, International Phycological Society, 2009, 0031-8884.

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: URL
• Impact factor: Impact factor: 1.218
• RIV identification code: RIV/00216224:14310/09:00029454
• Organization unit: Faculty of Science
• UT WoS: 000268126900388
• Keywords (in Czech): fotobiont; extémy prostředí; teplota; ozářenost; toxické kovy; fluorescence chlorofylu
• Keywords in English: photobiont; environmental extremes; temperature; irradiance; toxic metals; chlorophyll fluorescence

Abstract

Lichens are known for their ability to survive in extreme environments. A photobiont, considered as key element in sensitivity of whole organism, belongs mostly to the genus Trebouxia. In the study, three lichen photobiont species with different chloroplast morphology were investigated to characterize interspecific differences. The aim was to assess the effects of limiting conditions of temperature, light and presence of heavy metals (Cu and Cd)on primary production and the growth. Within the experiments, techniques of cultivation of algae in crossed gradients of temperature and irradiance were used. Growth differences and production of colonies were analyzed by photogrammetrical image analysis and determination of chlorophylls and carotenoids contents. The parameters of biomass growth as well as the parameters of CFI showed that temperature and light intensity optima for growth and photosynthetic activity of Trebouxia photobiont species lie between 16 to 18 deg.C and irradiances less than 50 umol.m-2.s-1. Limitation of growth and primary production of studied strains became apparent at the temperatures above 28 deg.C. At the tested light intensities above 200 umol.m-2.s-1, there were found signs of photoinhibition of photosynthesis.

Abstract (in Czech)

Lišejníky jsou známi svou schopností přežít v extrémních podmínkách prostředí. Fotobiont, považovaný za klíčový element v citlivosti celého organismu, náleží převážně k rodu Trebouxia. V táto studii byly zkoumány tři druhy lišejníkových fotobiontů s různou morfologií chloroplastu pro charakterizaci mezidruhových rozdílů. Cílem bylo zhodnotit vliv limitních podmínek teploty, ozářenosti a těžkých kovů na primární produkci a růst...

Links

• GP206/06/P209, research and development project: Name: Změny v množství a ve složení antioxidantů v lišejnících vystavených vysokému záření

Investor: Czech Science Foundation, Changes in the content and composition of antioxidants in high-light stressed lichens