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- Title
Photosynthetic and Respiratory Studies During Pod and Seed Development in Pisum sativum L.
- Authors
HARVEY, D. M.; HEDLEY, C. L.; KEELY, R.
- Abstract
The photosynthetic and respiratory potential of fruit depends on a combination of factors such as fruit age, light intensity and the atmospheric CO concentration. Fruit were capable of a net CO uptake from the atmosphere only during the period of pod extension growth and at light intensities greater than 12 klx. During subsequent development the respiratory CO evolution attributable to seed growth exceeded the photosynthetic capacity of the pod. Despite this the extent of fruit CO loss was consistently less in the light than in the dark. An increase in the CO concentration beyond 300 p.p.m. markedly reduced fruit CO loss and in some instances effected a transition from a net CO output to a net CO uptake. Conversely, a decrease in the CO concentration substantially increased the extent of fruit CO loss. The CO compensation point concentration increased with fruit age from 150 p.p.m. to possibly more than 550 p.p.m., whereas the corresponding value for the pod (minus seed) remained between 120 and 175 p.p.m. throughout fruit development. A proportion of the CO respired by the seed and pod accumulated within the pod cavity. The CO concentration attained depended on fruit age and nodal location. In the course of fruit development concentrations within the range 0⋅1 to 4˙3 per cent CO occurred during mid-photoperiod. The CO concentration was highest when the enclosed seed had attained approximately 50 per cent of their final dry weight.
- Publication
Annals of Botany, 1976, Vol 40, Issue 5, p993
- ISSN
0305-7364
- Publication type
Article