Maintenance respiration


Maintenance respiration refers to metabolism occurring in an organism that is needed to maintain that organism in a healthy, living state.

In plants

Maintenance respiration in plants refers to the amount of cellular respiration, measured by the carbon dioxide released or oxygen consumed, during the generation of usable energy and metabolic intermediates used for resynthesis of compounds that undergo renewal in the normal process of metabolism ; maintenance of chemical gradients of ions and metabolites across cellular membranes that are necessary for cellular integrity and plant health; and operation of metabolic processes involved in physiological adjustment to a change in the plant's environment. The metabolic costs of the repair of injury from biotic or abiotic stress may also be considered a part of maintenance respiration.
Maintenance respiration is essential for biological health and growth of plants. It is estimated that about half of the respiration carried out by terrestrial plants during their lifetime is for the support of maintenance processes. Because typically more than half of global terrestrial plant photosynthesis is used for plant respiration, more than one quarter of global terrestrial plant photosynthesis is presumably consumed in maintenance respiration.
Maintenance respiration is a key component of most physiologically based mathematical models of plant growth, including models of crop growth and yield and models of ecosystem primary production and carbon balance.