Water stress mitigates the negative effects of ozone on photosynthesis and biomass in poplar plants

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	Water stress mitigates the negative effects of ozone on photosynthesis and biomass in poplar plants
	Catalayud, Vicent; Gao, Feng; Paoletti, Elena; Hoshika, Yasutomo; Feng, Zhaozhong
刊名	ENVIRONMENTAL POLLUTION
	2017-11-01
卷号	230 页码:268-279
关键词	Critical Levels Drought Growth Ozone Photosynthesis Water Stress
英文摘要	Tropospheric ozone (O-3) pollution frequently overlaps with drought episodes but the combined effects are not yet understood. We investigated the physiological and biomass responses of an O-3 sensitive hybrid poplar clone ('546') under three O-3 levels (charcoal-filtered ambient air, non-filtered ambient air (NF), and NF plus 40 ppb) and two watering regimes (well-watered (WW) and reduced watering (RW), i.e. 40% irrigation) for one growing season. Water stress increased chlorophyll and carotenoid contents, protecting leaves from pigment degradation by O-3. Impairment of photosynthesis by O-3 was also reduced by stomatal closure due to water stress, which preserved light-saturated CO2 assimilation rate, and the maximum carboxylation efficiency. Water stress increased water use efficiency of the leaves while O-3 decreased it, showing significant interactions. Effects were more evident in older leaves than in younger leaves. Water stress reduced biomass production, but the negative effects of O-3 were less in RW than in WW for total biomass per plant. A stomatal O-3 flux-based dose-response relationship was parameterized considering water stress effects, which explained biomass losses much better than a concentration-based approach. The O-3 critical level of Phytotoxic Ozone Dose over a threshold of 7 nmol O-3.m(-2).s(-1) (POD7) for a 4% biomass loss in this poplar clone under different water regimes was 4.1 mmol m(-2). Our results suggest that current O-3 levels in most parts of China threaten poplar growth and that interaction with water availability is a key factor for O-3 risk assessment. (C) 2017 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39148]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Catalayud, Vicent,Gao, Feng,Paoletti, Elena,et al. Water stress mitigates the negative effects of ozone on photosynthesis and biomass in poplar plants[J]. ENVIRONMENTAL POLLUTION,2017,230:268-279.
APA	Catalayud, Vicent,Gao, Feng,Paoletti, Elena,Hoshika, Yasutomo,&Feng, Zhaozhong.(2017).Water stress mitigates the negative effects of ozone on photosynthesis and biomass in poplar plants.ENVIRONMENTAL POLLUTION,230,268-279.
MLA	Catalayud, Vicent,et al."Water stress mitigates the negative effects of ozone on photosynthesis and biomass in poplar plants".ENVIRONMENTAL POLLUTION 230(2017):268-279.