Comparative photosynthesis characteristics of Calycanthus chinensis and Chimonanthus praecox

Abstract

Calycanthus chinensis is an endangered plant of the national second-grade protection of China restricted in a small area in Zhejiang Province. We studied parameters of photosynthesis, chlorophyll (Chl) contents, and Chl fluorescence (minimum fluorescence, F 0 , maximum fluorescence, F m , variable fluorescence, F v , and F v /F m ) of C. chinensis and Chimonanthus praecox. C. chinensis had lower compensation irradiance but higher saturation irradiance than C. praecox. Hence C. chinensis has more advantage in obtaining and utilizing photon energy and higher Chl content, and is more adaptive to higher temperature and propitious to thermal dissipation than C. praecox. In addition, C. chinensis produces abundant, well-preserved seed with a higher germination rate and a wider adaptability to temperature than C. praecox. Thus C. chinensis is prone to survival and viability, and gets rid of the endangered plant species of the national secondgrade protection of China.

A Novel Hypothesis for the Role of Photosynthetic Physiology in Shaping Macroevolutionary Patterns

“…1). In general, our A 400 values corresponded well with previously reported estimates of light-saturated photosynthesis in our species (Mao et al, 2007;Jing et al, 2008;Yiotis and Manetas, 2010;Negret et al, 2013) with few disagreements (Volkova et al, 2010), which are likely a result of the lower measurement temperature used in our study. Despite the apparent lack of significant intergroup differences in the photosynthetic rates at current ambient and high [CO 2 ], gymnosperm taxa displayed a significantly higher photosynthetic stimulation (A 2,000 /A 400 ) along the transition from ambient to saturating [CO 2 ] (Fig.…”

Comparative studies on the photosynthetic characteristics of two maize (Zea mays L.) near-isogenic lines differing in their susceptibility to low light intensity

“…A high value of qP is beneficial for electric charge separation in the light reaction center, and to the electron transport and yield of PSII (Mao et al, 2007). In our study, the differences in qP values indicated that SN98A and SN98B had differences in electron transport activities in PSII under low light intensity.…”

Shading tolerance in rice is related to better light harvesting and use efficiency and grain filling rate during grain filling period

“…This might be due to the reduction in efficiency of excitation capture (Dai et al, 2009), as exemplified by the sharp decreased in J max under the shading conditions. Dai et al (2009) and Mao et al (2007) suggested that it was beneficial for electric charge separation in the reaction center to have a higher qP, and that a more efficient use of the absorbed energy in PSII was indicated by a lower NPQ (Guo et al, 2006). In this study, the chlorophyll fluorescence characteristics were closely related to rice variety.…”