Abstract
CO2 elevation improves photosynthetic performance in progressive warming environment in white birch seedlings
Highlights
Global climate warming and increases in atmospheric CO concentration are currently key topics for scientists, politicians and the general public alike[1]
Increases in CO2 and temperature to a certain extent should have positive impact on photosynthesis and growth, as the current atmospheric CO2 concentration is below the saturation point for RuBisCO (Ribulose-1,5-bisphosphate carboxylase oxygenase)[14]
High temperature and CO2 elevations may have synergistic effect on photosynthesis and CO2 elevations may lead to improved acclimation to high temperatures
Summary
Global climate warming and increases in atmospheric CO concentration are currently key topics for scientists, politicians and the general public alike[1]. The situation will become complicated if the temperature goes beyond plants’ ability to acclimate, or when the rate of temperature increase exceeds the pace of acclimation In such cases, temperature and CO2 will have opposite effects on photosynthesis, i.e., the higher temperature induced increase in photorespiration may exceed the beneficial effect of CO elevation, resulting in a decline in net photosynthesis. High temperature and CO2 elevations may have synergistic effect on photosynthesis and CO2 elevations may lead to improved acclimation to high temperatures Such interactions may vary with plant species[22,23] and other environmental conditions. In most past studies, high temperature treatments are achieved in one step, which is in contrast with the gradual, progressive increases in temperature occurring in global climate changes
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