Intraspecific variation in drought response of Populus cathayana grown under ambient and enhanced UV-B radiation

	Intraspecific variation in drought response of Populus cathayana grown under ambient and enhanced UV-B radiation
	Lu, YW ; Duan, BL ; Zhang, XL ; Korpelainen, H ; Berninger, F ; Li, CY
刊名	ANNALS OF FOREST SCIENCE
	2009
卷号	66 期号:6 页码:_
关键词	carbon nitrogen ratio photosynthetic nitrogen use efficiency Populus cathayana ultraviolet-b radiation water use efficiency
ISSN号	1286-4560
通讯作者	Li, CY, Chinese Acad Sci, Chengdu Inst Biol, POB 416, Chengdu 610041, Peoples R China.
中文摘要	The effects of drought, enhanced UV-B radiation and their combination on plant growth and physiological traits were investigated in a greenhouse experiment in two populations of Populus cathayana Rehder originating from high and low altitude in south-west China. In both populations, drought significantly decreased biomass accumulation and gas exchange parameters, including net CO2 assimilation rate (A), stomatal conductance (g(s)), transpiration rate (E) and photosynthetic nitrogen use efficiency (PNUE). However, instantaneous water use efficiency (WUEi), transpiration efficiency (WUET), carbon isotope composition (delta C-13) and nitrogen (N) content, as well as the accumulation of soluble protein, UV-absorbing compounds and abscisic acid (ABA) significantly increased in response to drought. On the other hand, cuttings from both populations, when kept under enhanced UV-B radiation, showed very similar changes, as under drought, in all above-mentioned parameters. Compared with the low altitude population, the high altitude population was more tolerant to drought and enhanced UV-B, as indicated by the higher level of biomass accumulation, gas exchange, water-use efficiency, ABA concentration and UV-absorbing compounds. After one growing season of exposure to different UV-B levels and watering regimes, the decrease in biomass accumulation and gas exchange, induced by drought, was more pronounced under the combination of UV-B and drought. Significant interactions between drought and UV-B were observed in WUEi, WUET, delta C-13, soluble protein, UV-absorbing compounds, ABA and in the leaf and stem N, as well as in the leaf and stem C: N ratio. Our results showed that UV-B acts as an important signal allowing P. cathayana seedlings to respond to drought and that the combination of drought and UV-B may cause synergistically detrimental effects on plant growth.
学科主题	Forestry
收录类别	SCI
资助信息	National Science Foundation of China [30525036]; Chinese Academy of Sciences [KSCX2YW-N-064]
语种	英语
公开日期	2011-07-08
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/22326]
专题	成都生物研究所_生态研究
推荐引用方式 GB/T 7714	Lu, YW,Duan, BL,Zhang, XL,et al. Intraspecific variation in drought response of Populus cathayana grown under ambient and enhanced UV-B radiation[J]. ANNALS OF FOREST SCIENCE,2009,66(6):_.
APA	Lu, YW,Duan, BL,Zhang, XL,Korpelainen, H,Berninger, F,&Li, CY.(2009).Intraspecific variation in drought response of Populus cathayana grown under ambient and enhanced UV-B radiation.ANNALS OF FOREST SCIENCE,66(6),_.
MLA	Lu, YW,et al."Intraspecific variation in drought response of Populus cathayana grown under ambient and enhanced UV-B radiation".ANNALS OF FOREST SCIENCE 66.6(2009):_.