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- Title
Physiological and biochemical responses of Machilus ichangensis Rehd. et Wils and Taxus chinensis (Pilger) Rehd. to elevated O in subtropical China.
- Authors
Yu, Hao; Chen, Zhan; Shang, He; Cao, Jixin
- Abstract
Considerable researches have documented the negative effects of ozone on woody species in North America and Europe; however, little is known about how woody tree species respond to elevated O in subtropical China, and most of the previous studies were conducted using pot experiment. In the present study, Machilus ichangensis Rehd. et Wils ( M. ichangensis) and Taxus chinensis (Pilger) Rehd. ( T. chinensis), evergreen tree species in subtropical China, were exposed to non-filtered air (NF), 100 nmol mol O (E1) and 150 nmol mol O (E2), in open-top chambers under field conditions from 21st March to 2nd November 2015. In this study, O fumigation significantly reduced net photosynthesis rate (Pn) in M. ichangensis in the three measurements and in T. chinensis in the last measurement. Also, non-stomatal factors should be primarily responsible for the decreased Pn. O fumigation-induced increase in malondialdehyde, superoxide dismutase, and reduced ascorbic acid levels indicated that antioxidant defense mechanism had been stimulated to prevent O stress and repair the oxidative damage. Yet, the increase of antioxidant ability was not enough to counteract the harm of O fumigation. Because of the decrease in CO assimilation, the growth of the two tree species was restrained ultimately. The sensitivity of the two tree species to O can be determined: M. ichangensis > T. chinensis. It suggests a close link between the rising O concentrations and the health risk of some tree species in subtropics in the near future.
- Subjects
EFFECT of ozone on plants; PHOTOSYNTHESIS; STOMATA; REACTIVE oxygen species; CARBON dioxide content of plants
- Publication
Environmental Science & Pollution Research, 2017, Vol 24, Issue 21, p17418
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-017-9417-3