title: Influence of UV-B exclusion and selenium treatment on photochemical efficiency of photosystem II, yield and respiratory potential in pumpkins (Cucurbita pepo L.).
abstract: The influence of ambient and filtered solar ultraviolet-B (UV)-B radiation and of selenium treatment was determined on photochemical efficiency, respiratory potential measured by electron transport system (ETS) activity, and yield in pumpkins, Cucurbita pepo L. Yield and ETS activity were higher when solar UV-B was filtered out. The results suggested that the decreased yield was related to the UV-B impaired flow of electrons in the respiratory chain. Selenium increased yield under ambient radiation conditions. However, no significant effect of excluding UV-B radiation or of treatment with selenium was observed on the photochemical efficiency of photosystem II (PSII).
authors.affiliation: National Institute of Biology, Vecna pot 111, SI-1111 Ljubljana, Slovenia.
authors.forename: Mateja
authors.initials: M
authors.lastname: Germ
authors.forename: Ivan
authors.initials: I
authors.lastname: Kreft
authors.forename: Joze
authors.initials: J
authors.lastname: Osvald
mesh_terms: D028464:Cucurbita / Q000187:drug effects* / Q000378:metabolism / Q000528:radiation effects*; D004579:Electron Transport / Q000187:drug effects / Q000528:radiation effects; D010788:Photosynthesis / Q000187:drug effects / Q000528:radiation effects; D045332:Photosystem II Protein Complex / Q000378:metabolism*; D012643:Selenium / Q000494:pharmacology*; D014466:Ultraviolet Rays
chemical_list: D045332:Photosystem II Protein Complex; D012643:Selenium