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Annals of Botany 41: 1191-1203, 1977
© 1977 Annals of Botany Company

RESEARCH-ARTICLE

Growth, Maintenance and Respiration: a Re-interpretation

J. H. M. THORNLEY

Glasshouse Crops Research Institute Littlehampton, West Sussex, BN16 3PU

Received: 18 November 1976   

The traditional view of respiration being due to the processes of growth and maintenance is questioned. A model is proposed in which plant dry matter is divided into three categories: storage material which may be used for growth; non-degradable structural material which cannot be recycled, and which is considered to be inert; and degradable structural material which is assigned a rate constant of degradation, and which is considered to be biologically active. The model has four parameters: two yield constants, and two rate constants, and it has been solved for steady-state exponential growth in continuous daylight, respiration in the dark, and l4CO2 evolution after a pulse label. Analysis of l4CO2 efflux data leads to the complete definition of the model. The utility and comparative merits of the suggested viewpoint of respiration are discussed.


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