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Annals of Botany 62: 473-479, 1988
© 1988 Annals of Botany Company

RESEARCH-ARTICLE

The Respiration of Mature Field Bean (Vicia faba L.) Leaves During Prolonged Darkness

D. E. IRVING* and J. H. SILSBURY

Department of Agronomy, Waite Agricultural Research Institute, The University of Adelaide, Glen Osmond South Australia, 5064

Accepted: 16 May 1988   

Dark respiration in attached and detached mature leaves of the field bean (Vicia faba L.) was studied whilst leaves experienced up to 60 h of darkness. The results showed: (1) the initial respiration rate to vary according to the irradiance during the previous photoperiod; (2) the dark respiration rate (per unit area) of attached leaves to be essentially constant during a normal 12 h night although there was a rapid loss in leaf d. wt during this time; (3) after 12 h, the respiration rate of attached leaves decayed to an asymptotic value at about 36 h; (4) the respiration rate of leaves detached at the end of the photoperiod and maintained in the dark on deionised water, decayed only after 36 h of darkness; (5) there was no difference between the respiration rate of attached and detached leaves during the normal 12 h night.

It is concluded that the dark respiration of attached field bean leaves is intially related to the synthesis and translocation of sucrose in addition to maintenance. After about 36 h, when the rate of CO2 efflux is more or less steady, the CO2 efflux reflects the intensity of maintenance processes only. The maintenance respiration rate (determined after 60 h in the dark) ranged from 0·62 to 1·51 mg CO2 (g d. wt)–1 h–1 but was relatively unaffected by several applied treatments.

Vicia faba L., field bean, respiration, maintenance, nitrate, non-structural carbohydrate, export


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