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 / 2013 | |||||||
Article: |
ORAL PRESENTATION ABSTRACTS: EFFECT OF UV-B STRESS ON THE PHOTOSYNTHETIC FUNCTION OF ERUCA SATIVA MILLER. Authors: LIA MLADIN, NORA PRODAN, COSMIN IONEL SICORA. |
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Abstract: VIEW PDF: ORAL PRESENTATION ABSTRACTS The global warming can determine the alteration of normal functionality of the ecosystems, threatening with extinction a significant number of species. Most important environmental factors inducing different types of stresses on plant photosynthesis are: temperature, excessive light, CO2 concentration. Destruction of the ozone layer that absorbing short wavelength UV radiation, increases the amount of UV-B radiation reaching the Earth’s surface. These radiations can cause damage of photosystem I and II, carbon fixation, low levels of chlorophyll and sucrose in plants. The study of photosynthesis utilizing chlorophyll fluorescence measurements is one of the most modern techniques used by plant physiologists and ecophysiologists. The modern fluorometers can measure the chlorophyll fluorescence in the laboratory and in the field. For the study of UV-B stress on Eruca sativa we have utilized the MONI PAM fluorometer that monitors the efficiency of PS II in greenhouse conditions under normal and enhanced UV-B irradiation. The monitored parameters are: PAR (Photosynthetic Active Radiation), basic fluorescence level (F) maximal fluorescence level (FM´), ETR (Electron Transport Rate), YII (efficiency of Photosystem II). Measurements were done on control samples, plants treated with low UV-B radiation and high UV-B radiation producing a wide range of adaptative responses including irreversible damages of photosynthetic processes. |
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