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Photosynthesis of Saussurea superba and Gentiana straminea is not reduced after long-term enhancement of UV-B radiation
Shi, SB; Zhu, WY; Li, HM; Zhou, DW; Han, F; Zhao, XQ; Tang, YH
2004-02-01
Source PublicationENVIRONMENTAL AND EXPERIMENTAL BOTANY
Volume51Issue:1Pages:75-83
SubtypeArticle
AbstractExperiments were conducted in an alpine Kobresia humilis meadow near Haibei Alpine Meadow Ecosystem Research Station (37degrees29'-37degrees45'N, 101degrees12'-101degrees33'E; altitude 3200 m). Effects of enhanced ultraviolet-B (UV-B) radiation on photosynthesis of the alpine plants of Saussurea superba and Gentiana straminea were investigated. Both species were exposed to a UV-B-BE density at 15.80 kJ m(-2) per day, simulating nearly 14% ozone (O-3) reduction during the plant growing season. Neither photosynthetic CO2 uptake rate nor photosynthetic O-2 evolution rate were decreased after a long period of enhanced UV-B radiation treatment. On the contrary, there was a tendency to increase of both parameters in both species. The photosynthetic pigments were also increased, when expressed on a leaf area basis. UV-B absorbing compounds, detected by the absorbance values at 300 mm, had a tendency to increase in both species after enhanced UV-B radiation. After long-term exposure of plants to enhanced UV-B radiation, leaf morphology was also affected. Leaf thickness in both S. superba and G. straminea were increased significantly (P < 0.001). This supports our hypothesis that the increase of leaf thickness in both species after long-term exposure of enhanced UV-B radiation could compensate for the photodestruction of photosynthetic pigments when light passes through the leaf. Therefore, photosynthesis is not reduced in either species when expressed on leaf area basis. (C) 2003 Elsevier B.V. All rights reserved.; Experiments were conducted in an alpine Kobresia humilis meadow near Haibei Alpine Meadow Ecosystem Research Station (37degrees29'-37degrees45'N, 101degrees12'-101degrees33'E; altitude 3200 m). Effects of enhanced ultraviolet-B (UV-B) radiation on photosynthesis of the alpine plants of Saussurea superba and Gentiana straminea were investigated. Both species were exposed to a UV-B-BE density at 15.80 kJ m(-2) per day, simulating nearly 14% ozone (O-3) reduction during the plant growing season. Neither photosynthetic CO2 uptake rate nor photosynthetic O-2 evolution rate were decreased after a long period of enhanced UV-B radiation treatment. On the contrary, there was a tendency to increase of both parameters in both species. The photosynthetic pigments were also increased, when expressed on a leaf area basis. UV-B absorbing compounds, detected by the absorbance values at 300 mm, had a tendency to increase in both species after enhanced UV-B radiation. After long-term exposure of plants to enhanced UV-B radiation, leaf morphology was also affected. Leaf thickness in both S. superba and G. straminea were increased significantly (P < 0.001). This supports our hypothesis that the increase of leaf thickness in both species after long-term exposure of enhanced UV-B radiation could compensate for the photodestruction of photosynthetic pigments when light passes through the leaf. Therefore, photosynthesis is not reduced in either species when expressed on leaf area basis. (C) 2003 Elsevier B.V. All rights reserved.
KeywordAdaptation Alpine Plants Leaf Morphology Ozone Depletion Qinghai-tibet Plateau
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Subject Area植物学
WOS KeywordSOLAR ULTRAVIOLET-RADIATION ; TERRESTRIAL ECOSYSTEMS ; ABSORBING COMPOUNDS ; EARTHS SURFACE ; PLANTS ; GROWTH ; HERBIVORY ; EXPOSURE ; OZONE
Indexed BySCI
Language英语
WOS Research AreaPlant Sciences ; Environmental Sciences & Ecology
WOS SubjectPlant Sciences ; Environmental Sciences
WOS IDWOS:000188203100008
Citation statistics
Document Type期刊论文
Identifierhttp://210.75.249.4/handle/363003/1402
Collection中国科学院西北高原生物研究所
Affiliation1.Chinese Acad Sci, NW Inst Plateau Biol, Xining 810001, Peoples R China
2.Natl Inst Environm Studies, Tsukuba, Ibaraki 3050053, Japan
Recommended Citation
GB/T 7714
Shi, SB,Zhu, WY,Li, HM,et al. Photosynthesis of Saussurea superba and Gentiana straminea is not reduced after long-term enhancement of UV-B radiation[J]. ENVIRONMENTAL AND EXPERIMENTAL BOTANY,2004,51(1):75-83.
APA Shi, SB.,Zhu, WY.,Li, HM.,Zhou, DW.,Han, F.,...&Tang, YH.(2004).Photosynthesis of Saussurea superba and Gentiana straminea is not reduced after long-term enhancement of UV-B radiation.ENVIRONMENTAL AND EXPERIMENTAL BOTANY,51(1),75-83.
MLA Shi, SB,et al."Photosynthesis of Saussurea superba and Gentiana straminea is not reduced after long-term enhancement of UV-B radiation".ENVIRONMENTAL AND EXPERIMENTAL BOTANY 51.1(2004):75-83.
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