Abstract
Elevated atmospheric CO2 concentration is a serious global environmental problem. Elevated CO2 affects plant growth by changing primary metabolism, closely related to carbon (C) and nitrogen (N) availability. Under sufficient N conditions, plant growth is dramatically promoted by elevated CO2. When N availability is limited, however, elevated CO2 disrupts the balance between cellular C and N (C/N). Disruption of the C/N balance is regarded as an important factor in plant growth defects. Here we highlight the regulation of senescence in higher plants by atmospheric CO2 and N, and the physiological function of C/N-related ubiquitin ligase ATL31 under condition of elevated CO2. We also provide an overview of the ubiquitin ligases and related enzymes involved in regulating senescence in plants.
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