Effects of ozone exposure on photosynthetic CO2 uptake and wood formation of Japanese cedar (Cryptomeria japonica) seedlings grown under elevated CO2

2015 Fiscal Year Final Research Report

• Project/Area Number: 25292092
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Forest science
• Research Institution: Forestry and Forest Products Research Institute
• Principal Investigator: Kitao Mitsutoshi 国立研究開発法人 森林総合研究所, 植物生態研究領域, 室長 (60353661)
• Co-Investigator(Kenkyū-buntansha): TOBITA Hiroyuki 国立研究開発法人森林総合研究所, 植物生態研究領域, 主任研究員 (10353781) ; YAZAKI Kenichi 国立研究開発法人森林総合研究所, 植物生態研究領域, 主任研究員 (30353890) ; HIRAOKA Yuichiro 国立研究開発法人森林総合研究所, 林木育種センター, 室長 (50370862)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 高CO2 / 高オゾン / スギ品種 / 光合成 / 幹材質

Outline of Final Research Achievements

To evaluate the physiological and morphological responses in clones of Japanese cedar (Cryptomeria japonica) to the future atmospheric environment, we investigated the effects of elevated CO2 and O3 concentrations on growth, photosynthesis and wood property in the seedlings of 6 clones of Japanese cedar grown under a free-air fumigation system. Total biomass including root biomass increased under elevated O3 across the 6 clones. Light-saturated photosynthetic rates measured under the growth CO2 conditions were significantly higher in the elevated-CO2-grown plants than the ambient-CO2-grown plants despite of O3 treatments. However, the maximum rates of Rubisco carboxylation decreased in the plants grown under elevated CO2. There were no significant effects of elevated CO2 and O3 on the density of wood, suggesting that both treatments might have little influence on the wood quality of Japanese cedar clones.

Free Research Field

樹木生理学