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AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name. |
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STUDIA BIOLOGIA - Issue no. 1 / 2012 | |||||||
Article: |
THE EFFECT OF LIGHT STRESS ON PS II PHOTOCHEMICAL ACTIVITY AT NOSTOC LINCKIA AICB 421. Authors: VICTOR BERCEA, ADRIANA HEGEDŰS (BICA), NICOLAE DRAGOŞ, COSMIN SICORA. |
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Abstract: The changes in chlorophyll fluorescence during a two hour period of high light were analyzed in cyanobacterium Nostoc linckia AICB 421. A light intensity of 800 µmoli.m-2.s-1 induced the decrease of Fm, Fv and maximal and effective quantum yield. In conditions of exposure to 1500 µmoli.m-2.s-1, F0, Fm, Fv and maximal and effective quantum yield decreased also, relative to control. A 2100 µmoli.m-2.s-1 light intensity increased the F0, Fm and Fv and the quantum yield values lowered. Photochemical coefficients maintained maximal values. Quantum yield of non-regulated energy dissipation Y(NO) was enhanced. Changes in chlorophyll fluorescence were caused by structural changes in the antenna and in the PSII reaction center, due to light stress. Keywords: minimal and maximal fluorescence, maximal and effective quantum yield, quantum yield of nonregulated energy dissipation, coefficient of photochemical quenching, phycobilisomes. |
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