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How important is woody tissue photosynthesis in EuCahetus dunnii Maiden and Osmanthus fragrans (Thunb.) Lour. under O3 stress?
Environ Sci Pollut Res Int 2018; 25(3):2112-2120ES

Abstract

Numerous studies have demonstrated the negative effects of elevated O3 on leaf photosynthesis. Within trees, a portion of respired CO2 is assimilated by woody tissue photosynthesis, but its response to elevated O3 remains unclear. Saplings of two evergreen tree species, EuCahetus dunnii Maiden (E. dunnii) and Osmanthus fragrans (Thunb.) Lour. (O. fragrans), were exposed to non-filtered air (NF), 100 nmol mol-1 O3 air (E1) and 150 nmol mol-1 O3 air (E2) in open-top chambers from May 5 to September 5, 2016 (8 h a day; 7 days a week) in subtropical China. In this study, O3 fumigation significantly reduced leaf net photosynthesis rate in both two tree species on most measurements. However, compared with leaf net photosynthesis rate, woody tissue gross photosynthesis rate showed less negative response to O3 fumigation and was even stimulated to increase. Refixation rate reflects the utilization efficiency of the respired CO2 by woody tissue photosynthesis. During the experiment period, E1 and E2 both increased refixation rate in O. fragrans compared with NF. Whereas for E. dunnii, E1 increased refixation rate until 81 days after starting of fumigation and then decreased it, and E2 decreased it all the time. Refixation rate had a significant positive correlation with woody tissue chlorophyll contents, indicating that the response of refixation rate to elevated O3 may relate to chlorophyll contents. All these suggested that under O3 fumigation, when atmospheric CO2 uptake and fixation by leaf is limited, woody tissue photosynthesis can contribute more to the total carbon assimilation in trees. The findings help to understand the significance of woody tissue photosynthesis under elevated O3 conditions.

Authors+Show Affiliations

Key Laboratory of Forest Ecology and Environment, State Forestry Administration of China, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China.Key Laboratory of Forest Ecology and Environment, State Forestry Administration of China, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China. shanghechina@126.com.Key Laboratory of Forest Ecology and Environment, State Forestry Administration of China, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China.Key Laboratory of Forest Ecology and Environment, State Forestry Administration of China, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29110232

Citation

Yu, Hao, et al. "How Important Is Woody Tissue Photosynthesis in EuCahetus Dunnii Maiden and Osmanthus Fragrans (Thunb.) Lour. Under O3 Stress?" Environmental Science and Pollution Research International, vol. 25, no. 3, 2018, pp. 2112-2120.
Yu H, Shang H, Cao J, et al. How important is woody tissue photosynthesis in EuCahetus dunnii Maiden and Osmanthus fragrans (Thunb.) Lour. under O3 stress? Environ Sci Pollut Res Int. 2018;25(3):2112-2120.
Yu, H., Shang, H., Cao, J., & Chen, Z. (2018). How important is woody tissue photosynthesis in EuCahetus dunnii Maiden and Osmanthus fragrans (Thunb.) Lour. under O3 stress? Environmental Science and Pollution Research International, 25(3), pp. 2112-2120. doi:10.1007/s11356-017-0584-z.
Yu H, et al. How Important Is Woody Tissue Photosynthesis in EuCahetus Dunnii Maiden and Osmanthus Fragrans (Thunb.) Lour. Under O3 Stress. Environ Sci Pollut Res Int. 2018;25(3):2112-2120. PubMed PMID: 29110232.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - How important is woody tissue photosynthesis in EuCahetus dunnii Maiden and Osmanthus fragrans (Thunb.) Lour. under O3 stress? AU - Yu,Hao, AU - Shang,He, AU - Cao,Jixin, AU - Chen,Zhan, Y1 - 2017/11/06/ PY - 2017/06/11/received PY - 2017/10/24/accepted PY - 2017/11/8/pubmed PY - 2018/11/9/medline PY - 2017/11/8/entrez KW - E. dunnii KW - Leaf photosynthesis KW - O. fragrans KW - O3 fumigation KW - Refixation rate KW - Woody tissue photosynthesis SP - 2112 EP - 2120 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 25 IS - 3 N2 - Numerous studies have demonstrated the negative effects of elevated O3 on leaf photosynthesis. Within trees, a portion of respired CO2 is assimilated by woody tissue photosynthesis, but its response to elevated O3 remains unclear. Saplings of two evergreen tree species, EuCahetus dunnii Maiden (E. dunnii) and Osmanthus fragrans (Thunb.) Lour. (O. fragrans), were exposed to non-filtered air (NF), 100 nmol mol-1 O3 air (E1) and 150 nmol mol-1 O3 air (E2) in open-top chambers from May 5 to September 5, 2016 (8 h a day; 7 days a week) in subtropical China. In this study, O3 fumigation significantly reduced leaf net photosynthesis rate in both two tree species on most measurements. However, compared with leaf net photosynthesis rate, woody tissue gross photosynthesis rate showed less negative response to O3 fumigation and was even stimulated to increase. Refixation rate reflects the utilization efficiency of the respired CO2 by woody tissue photosynthesis. During the experiment period, E1 and E2 both increased refixation rate in O. fragrans compared with NF. Whereas for E. dunnii, E1 increased refixation rate until 81 days after starting of fumigation and then decreased it, and E2 decreased it all the time. Refixation rate had a significant positive correlation with woody tissue chlorophyll contents, indicating that the response of refixation rate to elevated O3 may relate to chlorophyll contents. All these suggested that under O3 fumigation, when atmospheric CO2 uptake and fixation by leaf is limited, woody tissue photosynthesis can contribute more to the total carbon assimilation in trees. The findings help to understand the significance of woody tissue photosynthesis under elevated O3 conditions. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/29110232/How_important_is_woody_tissue_photosynthesis_in_EuCahetus_dunnii_Maiden_and_Osmanthus_fragrans__Thunb___Lour__under_O3_stress L2 - https://dx.doi.org/10.1007/s11356-017-0584-z DB - PRIME DP - Unbound Medicine ER -