Please use this identifier to cite or link to this item: https://ptsldigital.ukm.my/jspui/handle/123456789/778205
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dc.contributor.authorM. Tevini-
dc.contributor.editorMohammad Ilyas-
dc.date.accessioned2025-03-04T04:49:41Z-
dc.date.available2025-03-04T04:49:41Z-
dc.identifier.isbn9838610623en_US
dc.identifier.urihttps://ptsldigital.ukm.my/jspui/handle/123456789/778205-
dc.description.abstractThe potential impacts of an increase in solar UV-B radiation reaching the Earth's surface due to stratospheric ozone depletion have been investigated by several research groups during the last 15 years. Much of this research has centered on the effects on plant growth and physiology under artificial UV-B irradiation supplied to plants in growth chambers or greenhouses. Recent experiments have also utilized artificially produced ozone cuvettes to filter natural solar radiation and simulate an environment of reduced UV-B for comparative purposes. Overall, the effectiveness of UV-B varies both among species and among cultivars of a given species. Sensitive plants often exhibit reduced growth (plant height, dry weight, leaf area), photosynthetic activity and flowering. Competitive interactions may also be altered indirectly by differential growth responses. Photosynthetic activity may be reduced by direct effects on photosynthetic components, metabolic pathways or indirectly through effects on stomatal function. Plants sensitive to UV-B can also respond by accumulating UV-absorbing compounds in their outer tissue layers, which presumably protect sensitive targets from UV damage. Several key enzymes in the biosynthetic pathways of these compounds have been shown to be specifically induced by UV-B irradiation. Few studies have documented the effects of UV-B on total plant yield under field conditions. One notable exception is a six-year study with soybean demonstrating harvestable yield reductions under a simulated 25% ozone depletion. These effects are further modified by prevailing microclimatic conditions. Plants tend to be less sensitive to UV-B radiation under drought or mineral deficiency, while sensitivity increases under low levels of visible light. Further studies are needed to understand the mechanisms of UV-B effects and the interactions with present stresses and future projected changes in the environment.en_US
dc.language.isoenen_US
dc.publisherUniversity of Science Malaysia; United Nations Environment Programmeen_US
dc.subjectUV-B radiationen_US
dc.subjectOzone depletionen_US
dc.subjectPlant growthen_US
dc.titleUv-b effects on terrestrial plantsen_US
dc.typeSeminar Papersen_US
dc.format.pages213-226en_US
dc.identifier.callnoGBQC879.7.I57 1990e semkaten_US
dc.contributor.conferencenameInternational Conference on Tropical Ozone and Atmospheric Change-
dc.contributor.conferencenameOzone Depletion : Implications for the Tropics-
dc.coverage.conferencelocationPulau Pinang-
dc.date.conferencedate1990-02-20-
Appears in Collections:Seminar Papers/ Proceedings / Kertas Kerja Seminar/ Prosiding

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