Photosynthesis of Saussurea superba and Gentiana straminea is not reduced after long-term enhancement of UV-B radiation

	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
刊名	environmental and experimental botany
	2004-02-01
卷号	51 期号:1 页码:75-83
关键词	adaptation alpine plants leaf morphology ozone depletion qinghai-tibet plateau
合作状况	其它
中文摘要	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.
英文摘要	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.
学科主题	植物学
WOS标题词	science & technology ; life sciences & biomedicine
类目[WOS]	plant sciences ; environmental sciences
研究领域[WOS]	plant sciences ; environmental sciences & ecology
关键词[WOS]	solar ultraviolet-radiation ; terrestrial ecosystems ; absorbing compounds ; earths surface ; plants ; growth ; herbivory ; exposure ; ozone
收录类别	SCI
语种	英语
WOS记录号	WOS:000188203100008
公开日期	2009-12-10
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/1402]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, NW Inst Plateau Biol, Xining 810001, Peoples R China 2.Natl Inst Environm Studies, Tsukuba, Ibaraki 3050053, Japan
推荐引用方式 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.