Effects of Ozone and Soil Water Stress, Singly and in Combination, on Leaf Antioxidative Systems of <i>Fagus crenata</i> Seedlings

Foliar chemical composition of two oak species grown in a free-air enrichment system with elevated O₃ and CO₂

“…Koike et al, 2013). Thus, O 3 has been regarded as one of the most serious environmental stresses for plants (Matyssek et al, 2012;Agathokleous et al, 2015), concerning with forest decline and tree dieback in East Asia (Izuta and Nakaji, 2003;Izuta, 2006;Watanabe et al, 2005). O 3 concentration usually shows the highest value from spring to summer in northeast Japan (Yamaji et al, 2006).…”

Experimental Studies on the Effects of Ozone on Growth and Photosynthetic Activity of Japanese Forest Tree Species

“…Yonekura et al (2001a, b) reported the additive effects of O 3 and soil water stress on the growth of Japanese beech seedlings. On the other hand, Watanabe et al (2005) reported that chronic soil water stress counteracted the negative effects of O 3 on net photosynthesis of the leaves of Japanese beech seedlings. Combined effects of O 3 and other environmental factors such as elevated CO 2 and drought on growth and physiological functions of Japanese forest tree species are still poorly understood.…”

“…It was also reported that the exposure to O 3 reduced the net photosynthetic rate of the leaves or needles of Japanese white birch, Japanese red pine, Japanese larch, Q. serrata and C. sieboldii (Watanabe et al, 2008(Watanabe et al, , 2007(Watanabe et al, , 2006Nakaji et al, 2004;Nakaji and Izuta, 2001;Matsumura et al, 1998). When net photosynthetic rate was reduced by the exposure to O 3 , simultaneous reductions in the carboxylation efficiency (CE), CO 2 -saturated net photosynthetic rate (A max ) and/or maximum quantum yield of photosystem (PS) II (F v /F m ), and increase in the stomatal diffusive conductance to water vapor (g s ) in the leaves or needles of Japanese forest tree species were also observed (Yamaguchi et al, 2007a;Watanabe et al, 2005;Nakaji and Izuta, 70 Asian Journal of Atmospheric Environment, Vol. 5(2), 65-78, 2011 2001; Yonekura et al, 2001a, b;Matsumura et al, 1998Matsumura et al, , 1996Izuta et al, 1996).…”

“…5(2), 65-78, 2011 2001; Yonekura et al, 2001a, b;Matsumura et al, 1998Matsumura et al, , 1996Izuta et al, 1996). It was documented that the exposure to O 3 reduced the concentration and activity of ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) and chlorophyll concentration in the leaves or needles of Japanese forest tree species (Watanabe et al, 2007(Watanabe et al, , 2005Yamaguchi et al, 2007a, b;Nakaji et al, 2004;Nakaji and Izuta, 2001;Yonekura et al, 2001a;Izuta et al, 1996;Miwa et al, 1993). Yonekura et al (2001b) reported that the O 3 -induced reduction in net photosynthetic rate was firstly due to the reduction in the quantity and/or activity of Rubisco in the leaves of Japanese beech.…”

“…EPA, 2006b). Unfortunately, there is little information on the combined effects of O 3 and elevated CO 2 or soil water stress on Japanese forest tree species (Watanabe et al, , 2005Matsumura et al, 2005;Yonekura et al, 2001a, b). Matsumura et al (2005) reported that the effect of elevated CO 2 on O 3 -induced reduction in growth was counteractive in Japanese white birch seedlings, while not in the Japanese mountain birch (Betula ermanii), Japanese beech, Japanese red pine and Japanese cedar seedlings.…”