Journal
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
Volume 100, Issue -, Pages 94-104Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2013.12.016
Keywords
Biomass; Drought stress; Fluorescence transient; Gas exchange; Ozone; Poplar clones; Stable isotopes
Categories
Funding
- General Directorate for Environmental Quality of Regione Lombardia
- Regional Agency for Services to Agriculture and Forests - E.R.S.A.F.
- Lombardy Foundation for the Environment (F.L.A.)
- Regional Agency for Environment Protection (A.R.P.A.)
Ask authors/readers for more resources
An open-top chamber experiment has been carried out at the facilities of Curno (North Italy), in June-August 2009, to assess the response to ozone in two poplar clones Populus maximowiczii Henry x P. berolinensis Dippel (Oxford clone, OX), and Populus nigra Jean Pourtet (JP) in concomitance of severe drought events. Three different water regimes were applied: W - Well Watered Control: field capacity; D1 - Drought Treatment 1: field capacity until begin July, then reduced water availability (plants were then subjected to severe drought events); D2 - Drought Treatment 2: constant water shortage (plants were then subjected to severe drought events). Leaf water potential, gas exchange and chlorophyll fluorescence (JIP-test) were assessed every 2 weeks; growth parameters and stable isotope composition (delta C-13 and delta O-18) were measured at the end of the experiment. The main results were: (i) drought, but not ozone, reduced photosynthesis and growth and increased delta C-13; (ii) the two clones showed different strategies to cope with ozone stress: JP shed the damaged leaves, whereas OX maintained their leaves ozone provoked the loss of leaves in W plants of the JP clone; (iii) in the D1 plants the response to drought provokes an additional effects with the effect of ozone absorbed before the severe drought events; (iv) D2 plants did not respond to ozone until the last event, when a clear synergistic effect between the two stressors was observed. We conclude that ozone had different effects in relation to the way the drought stress was applied. These results are discussed for their ecological consequence on vegetation in field conditions. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available