Photosynthetica 2018, 56(3):901-910 | DOI: 10.1007/s11099-017-0747-7

Growth and photosynthetic response of two larches exposed to O3 mixing ratios ranging from preindustrial to near future

T. Sugai1, D. G. Kam1, E. Agathokleous1,2,*, M. Watanabe1,3, K. Kita4, T. Koike1,*
1 Silviculture and Forest Ecological Studies, Hokkaido University, Sapporo, Hokkaido, Japan
2 Hokkaido Research Center, Forestry and Forest Products Research Institute (FFPRI), Sapporo, Hokkaido, Japan
3 Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan
4 Forestry Research Institute, Hokkaido Research Organization (HRO), Bibai, Hokkaido, Japan

In this study, we questioned whether ground-level ozone (O3) induces hormesis in Japanese larch (Larix kaempferi) and its hybrid F1 (L. gmelinii var. japonica × L. kaempferi). In order to answer the question, we exposed seedlings of both taxa to four O3 treatments [ranging from ≈10 to 60 nmol(O3) mol-1] in open-top chambers for two consecutive growing seasons. We found a hormetic response in maximum photosynthetic rate (PNmax) at 1700 μmol(CO2) mol-1 and maximum rates of carboxylation (Vcmax) and electron transport (Jmax) in both larches. Stimulation of PNmax, Vcmax, and Jmax did not lead to suppressed plant productivity in Japanese larch, which followed a stress-tolerant strategy, but it did lead to suppressed plant productivity in hybrid larch which followed a competitive strategy. These findings are the first to suggest that stimulation of physiological functions by low O3 exposures may have negative consequences for larch reproduction.

Additional key words: biphasic; competition; dose-response; homeostasis; hormesis; plasticity

Received: March 14, 2017; Accepted: May 15, 2017; Prepublished online: September 1, 2018; Published: August 1, 2018  Show citation

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Sugai, T., Kam, D.G., Agathokleous, E., Watanabe, M., Kita, K., & Koike, T. (2018). Growth and photosynthetic response of two larches exposed to O3 mixing ratios ranging from preindustrial to near future. Photosynthetica, 56(3), 901-910. doi: 10.1007/s11099-017-0747-7
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