Abstract
The daily courses of the CO2 and water vapour exchange of single intact vege tative Phaseolus vulgaris plants were monitored in plant chamber under an opti mal water supply and during the depletion of moisture in the root zone. The coefficients of the maintenance and growth respiration were calculated from CO2 exchange in a steady-state regime under optimum conditions. Using the same coefficients, the dynamics of the rate of synthesis of structural dry matter and of the amount of reserve materials were calculated during the depletion of moisture. Comparing the calculated increments with the measured increase of sugars and starch, it is concluded that under a rapidly developing water stress the maintenance coefficient of dark respiration increases, while the growth coefficient remains unchanged. It is suggested that under an increasing water stress appears an adaptational component of dark respiration associated with resynthe sis and redistribution of biomass between different parts of the plant.
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© 1983 Martinus Nijhoff/Dr W. Junk Publishers, The Hague
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Moldau, H., Rahi, M. (1983). Enhancement of Maintenance Respiration Under Water Stress. In: Marcelle, R., Clijsters, H., van Poucke, M. (eds) Effects of Stress on Photosynthesis. Advances in Agricultural Biotechnology, vol 3. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6813-4_11
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DOI: https://doi.org/10.1007/978-94-009-6813-4_11
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