Effects of elevated CO₂concentration and increased temperature on leaf related-physiological responses of Phytolacca insularis (native species) and Phytolacca americana (invasive species)

Abstract

In the study, the effects of elevated CO 2 and temperature on the photosynthetic characteristics, chlorophyll content, nitrogen content, carbon content, and C/N ratio of Phytolacca insularis and Phytolacca americana were examined under control (ambient CO 2 + ambient temperature) and treatment (elevated CO 2 + elevated temperature) for 2 years (2008 and 2009). The photosynthetic rate, transpiration rate and water use efficiency of two plant species were higher under the treatment than the under the control. The stomatal conductance of P. insularis was higher under the control, but that of P. americana was not significantly affected by CO 2 and temperature under the treatment. The chlorophyll contents of two species were decreased about 72.5% and 20%, respectively, by elevated CO 2 and temperature. The nitrogen contents of two species were not significantly altered by increase in CO 2 and temperature. The carbon contents of the two species were higher under the treatment than under the control. The C/N ratio of P. insularis was higher under the treatment but that of P. americana was not significantly affected by CO 2 and temperature. These results demonstrated that the physiological responses of P. insularis native plants might be more sensitively influenced by a CO 2-mediated global warming situation than those of the P. americana invasive plants.

Impact of warming climate on barley and tomato growth and photosynthetic pigments

“…4). Contrariwise, Kim and You (2010) in the study with Phytolacca insularis and Phytolacca americana determined that the chlorophyll content of both species was reduced under elevated CO 2 and temperature, how ever, the photosynthetic rates were higher in the treatment, despite the observed decline in chlorophyll content. As stated by Hamid et al (2009), chlorophyll is the central part of the energy manifestation of every green plant system and, therefore, any significant alteration in its levels is likely to cause a marked effect on the entire metabolism of plants.…”

Effect of Elevated CO2Concentration and Temperature on the Growth and Ecophysiological Responses of Ginseng (Panax ginseng C. A. Meyer)

“…이러한 이유로 본 실험에서는 대조구보다 CO2 + 온도상승구가 2℃ 높았기 때문에 증산 률이 증가한 것으로 보인다. 이와 유사하게, CO2 + 온도상승구에서 섬자리공과 미국 자리공의 광합성률과 수분이용효율은 2종 모두 증가하였지 만, 증산률은 모두 대조구와 CO2 + 온도상승구보다 온도상 승구가 가장 높은 연구결과가 있다 (Kim, 2010b).…”

Effects of elevated CO2 concentration and increased temperature on leaf quality responses of rare and endangered plants

“…The leaves of Q. gilva, an endangered plant, had an increased C:N ratio due to their reduced nitrogen content grown under elevated CO 2 and temperature conditions (Kim and You 2010).…”

“…Recently, researches are being carried out to obtain information about ecological responses of rare and endangered plants under elevated CO 2 and temperature (Kim and You 2010;Shin et al 2012;Han et al 2012), but unfortunately there is still a lack of studies on their biological and ecological responses under climate change situations (Aleric and Kirkman 2005). Moreover, there has been no study that tried to determine the effects of elevated CO 2 and temperature on changes in foliage biochemistry of various rare and endangered plants.…”